although the invention is described in terms of a specific embodiment , it will be readily apparent to those skilled in this art that various modifications , rearrangements and substitutions can be made without departing from the spirit of the invention . the scope of the invention is defined by the claims appended hereto . reference is made in general to the figures , wherein one embodiment of a watercraft support device 10 is shown , and depicted specifically in fig1 . the device 10 comprises a flat platform 12 , a cradling platform 14 , and a ramp platform 16 . the platforms aeneid 16 are linked together and provide a floating surface on which a watercraft may be parked . as will be described below , the device 10 is attached to a dock 18 via tethering posts 19 which are permanently secured to the dock 18 and which pass through vertical bores 20 , 20 &# 39 ; in the device . now referring generally to fig2 - 4 , the flat platform 12 is a substantially - rectangular , rigid structure having a horizontal upper surface 22 spaced apart from a horizontal lower surface 24 by a first vertical sidewall 26 , a second vertical sidewall 28 , a vertical front wall 30 , and a vertical back wall 32 . an integral frontal linking arm 34 extends from the front wall 30 . the frontal linking arm 34 is bounded by the upper surface 22 , first sidewall 26 , and second sidewall 28 of the flat platform 12 . the frontal linking arm 34 has an inclined bottom surface 36 . as such , the distance between the upper surface 22 and the bottom surface 36 decreases from a maximum near the flat platform front wall 30 to a minimum at a distal end 38 of the linking arm 34 . an integral rearward linking arm 40 extends from the back wall 32 . the rearward linking arm 40 is bounded by the lower surface 24 , first sidewall 26 , and second sidewall 28 of the flat platform 12 . the rearward linking arm 40 has an inclined top surface 42 . as such , the distance between the lower surface 24 and the top surface 42 decreases from a maximum near the flat platform back wall 32 to a minimum at a distal end 44 of the linking arm 40 . now referring generally to fig2 , and 6 , the cradling platform 14 is a substantially - rectangular , rigid structure having a horizontal upper surface 46 spaced apart from a horizontal lower surface 48 by a first vertical sidewall 50 , a second vertical sidewall 52 , a vertical front wall 54 , and a vertical back wall 56 . an integral frontal linking arm 58 extends from the front wall 54 . the frontal linking arm 58 is bounded by the upper surface 46 , first sidewall 50 , and second sidewall 52 of the cradling platform 12 . the frontal linking arm 58 has an inclined bottom surface 60 . as such , the distance between the upper surface 46 and the bottom surface 60 decreases from a maximum near the cradling platform front wall 54 to a minimum at a distal end 62 of the linking arm 58 . an integral rearward linking arm 64 extends from the back wall 56 . the rearward linking arm 64 is bounded by the lower surface 48 , first sidewall 50 , and second sidewall 52 of the cradling platform 12 . the rearward linking arm 64 has an inclined top surface 66 . as such , the distance between the lower surface 48 and the top surface 66 decreases from a maximum near the cradling platform back wall 56 to a minimum at a distal end 68 of the linking arm 64 . an arched support channel 70 rises upward from the cradling platform upper surface 46 . the support channel 70 runs the longitudinal length of the upper surface 46 . the support channel 70 resembles a half - pipe which opens upward . to ease loading and unloading of a watercraft , the channel 70 advantageously has a smooth surface to keep sliding friction between the channel 70 and the watercraft to a minimum . now referring generally to fig2 , and 8 , the ramp platform 16 is a substantially - rectangular , rigid structure having a horizontal upper surface 72 spaced apart from a horizontal lower surface 74 by a first vertical sidewall 76 , a second vertical sidewall 78 , a vertical front wall 80 , and a vertical back wall 82 . an integral frontal linking arm 84 extends from the front wall 80 . the frontal linking arm 84 is bounded by the upper surface 72 , first sidewall 76 , and second sidewall 78 of the cradling platform 14 . the frontal linking arm 84 has an inclined bottom surface 86 . as such , the distance between the upper surface 72 and the bottom surface 86 decreases from a maximum near the ramp platform front wall 80 to a minimum at a distal end 88 of the linking arm 84 . an integral rearward linking arm 90 extends from the back wall 82 . the rearward linking arm 90 is bounded by the upper surface 72 , first sidewall 76 , and second sidewall 78 of the ramp platform 12 . the rearward linking arm 90 has a horizontal bottom surface 92 . an arched support channel 94 extends upward from the ramp platform upper surface 72 . the support channel 94 resembles a half - pipe which opens upward . to ease loading and unloading of a watercraft , the channel 94 advantageously has a smooth surface to keep sliding friction between the channel 94 and the watercraft to a minimum . the support channel 94 runs the longitudinal length of the ramp platform upper surface 72 . near the ramp platform back wall , however , the support channel is tapered , passing through the rearward linking arm 90 to form a ramped entrance 98 . the ramped entrance 98 resembles a three - sided funnel . the entrance 98 serves to guide a watercraft into the support channels 70 , 94 . the entrance 98 also provides an incline along which a watercraft may travel during loading , as it leaves the water , or during unloading , as it enters the water . as a result , the ramped entrance 98 advantageously eliminates the need for a lifting crane to raise or lower the watercraft . referring to fig3 and 4 , frusto - conical bores 20 , 20 &# 39 ; extend vertically through flat platform frontal linking arm 34 . bore 20 passes through linking arm 34 near the first sidewall 26 , while bore 20 &# 39 ; passes through linking arm 34 near the second sidewall 28 . the bores 20 , 20 &# 39 ; are tapered : their diameters decrease from a maximum near the upper surface 22 to a minimum near the linking arm bottom surface 36 . frusto - conical bores 100 , 100 &# 39 ; extend vertically through flat platform rearward linking arm 40 . bore 100 passes through linking arm 40 near the first sidewall 26 , while bore 100 &# 39 ; passes through linking arm 40 near the second sidewall 28 . the bores 100 , 100 &# 39 ; are tapered : their diameters decrease from a maximum near the lower surface 24 to a minimum near the linking arm top surface 42 . each bore 20 , 20 &# 39 ;, 100 , 100 &# 39 ; is characterized by a pair of vertical channels 110 . the bores 20 , 20 &# 39 ;, 100 , 100 &# 39 ; and channels 110 are shaped to accept linking pins 112 and their associated locking tabs 114 . referring to fig5 and 6 , frusto - conical bores 102 , 102 &# 39 ; extend vertically through cradling platform frontal linking arm 58 . bore 102 passes through linking arm 58 near the first sidewall 50 , while bore 102 &# 39 ; passes through linking arm 58 near the second sidewall 52 . the bores 102 , 102 &# 39 ; are tapered : their diameters decrease from a maximum near the upper surface 46 to a minimum near the linking arm bottom surface 60 . frusto - conical bores 104 , 104 &# 39 ; extend vertically through cradling platform rearward linking arm 64 . bore 104 passes through linking arm 64 near the first sidewall 50 , while bore 104 &# 39 ; passes through linking arm 64 near the second sidewall 52 . the bores 104 , 104 &# 39 ; are tapered : their diameters decrease from a maximum near the lower surface 48 to a minimum near the linking arm top surface 66 . each bore 102 , 102 &# 39 ;, 104 , 104 &# 39 ; is characterized by a pair of vertical channels 110 . the bores 102 , 102 &# 39 ;, 104 , 104 &# 39 ; and channels 110 are shaped to accept linking pins 112 and their associated locking tabs 114 . referring to fig7 and 8 , frusto - conical bores 106 , 106 &# 39 ; extend vertically through ramp platform frontal linking arm 84 . bore 106 passes through linking arm 84 near the first sidewall 76 , while bore 106 &# 39 ; passes through linking arm 84 near the second sidewall 78 . the bores 106 , 106 &# 39 ; are tapered : their diameters decrease from a maximum near the upper surface 72 to a minimum near the linking arm bottom surface 86 . frusto - conical bores 108 , 108 &# 39 ; extend vertically through ramp platform rearward linking arm 90 . bore 108 passes through linking arm 90 near the first sidewall 76 , while bore 108 &# 39 ; passes through linking arm 90 near the second sidewall 78 . the bores 108 , 108 &# 39 ; are tapered : their diameters decrease from a maximum near the upper surface 72 to a minimum near the arm bottom surface 92 . each bore 106 , 106 &# 39 ;, 108 , 108 &# 39 ; is characterized by a pair of vertical channels 110 . the bores 106 , 106 &# 39 ;, 108 , 108 &# 39 ; and channels 110 are shaped to accept linking pins 112 and their associated locking tabs 114 . referring generally to fig2 and 9 , linking pins 112 are used to secure adjacent platforms 12 , 14 , 16 together . each pin 112 has an enlarged head plate 116 and a cylindrical body 118 . a pair of locking tabs 114 extends radially from the body 118 , near the bottom of the pin 112 . the tabs 114 are sized to fit bore channels 110 . a example of pin 112 use is now provided . the back wall 32 of flat platform 12 is placed against front wall 54 of cradling platform 14 , so that the flat plate rearward linking arm 40 overlaps cradling platform frontal linking arm 58 , and bores 100 , 100 &# 39 ; are aligned with bores 102 , 102 &# 39 ;. a linking pin 112 is positioned over bore 102 . the pin 112 is pushed down and fed through bore 102 into bore 100 . when the locking tabs 114 emerge past the lower surface 24 of the flat platform frontal linking arm 40 , the pin 112 is rotated until the tabs 114 are no longer aligned with the channels 110 of bore 100 , thus securing the pin 112 within the bores 100 , 102 . this procedure is repeated with aligned bores 102 &# 39 ; and 100 &# 39 ;. the ramp platform frontal linking arm 84 is attached to the cradling platform rearward linking arm 64 in a similar fashion . additional platforms may be added by repeating this overlapping and linking pin 112 placement procedure with as many platforms 12 , 14 , 16 as are needed . in one embodiment , the device is secured to a dock 18 via tethering posts 19 which pass through selected bores 20 , 20 &# 39 ;. the posts 19 are part of a four - piece unit . the unit includes a pipe securing ring 120 which is bolted to a vertical face of the dock 18 . a horizontal piece of pipe 122 extends away from the dock 18 , outward from the ring 120 . a ninety - degree transition elbow 124 is glued to the free end of the horizontal pipe 122 . a vertical piece of pipe 19 extends from the elbow 124 , downward into the water . the vertical pipe 19 extends into the water far enough so that the bottom edge of the pipe 19 is below the water surface at all times , even during possible low tides . the outer diameter of the vertical pipe 19 is chosen to allow unencumbered vertical motion of the device 10 , in response to tides or wave action . in one embodiment , the vertical pipes 19 have an outer diameter of six inches , while the bores 20 , 20 &# 39 ; have a minimum inner diameter of seven inches . although the tethering posts 19 have been described as part of a four - piece unit , other configurations may be used . for example , a piling driven into an underwater surface may also be sufficient . a watercraft is loaded onto the support device 10 by driving the watercraft towards the device 10 and aiming the bow of the watercraft towards the ramped entrance 98 . as the watercraft enters the ramped entrance 98 , the watercraft &# 39 ; s bow will travel upward and enter the ramp platform support channel 94 . as the watercraft travels along the ramped entrance 98 , the ramp platform 16 will tend to tilt . that is , the back wall 82 will move down , and the front wall 80 will move up . this tilting is controlled by the linking pins 112 which are locked into place within bores 104 , 104 &# 39 ;, 106 , 106 &# 39 ;. since the bores 104 , 104 &# 39 ;, 106 , 106 &# 39 ; are frusto - conical and the pins 112 are cylindrical , the ramp platform frontal linking arm 84 and the cradling platform rearward linking arm 64 are attached , essentially , in a hinge - like fashion . additionally , the incline found on the bottom surface 86 of the ramp platform frontal linking arm 84 is opposite the incline found on the top surface 66 of the cradling platform rearward linking arm 64 . these opposite inclines allow the ramp platform frontal linking arm 84 to pivot away from cradling platform rearward linking arm 64 without damage to either arm . as more of the watercraft travels further onto the device 10 , the cradling platform 14 begins to tilt with respect to the flat platform 12 . this titling is facilitated by the cooperation of bores 100 , 100 &# 39 ;, 102 , 102 &# 39 ; and the linking pins 112 secured therein . as described above , the frusto - conical shape of the bores 100 , 100 &# 39 ;, 102 , 102 &# 39 ; combines with the cylindrical shape of the pins 112 to provide a hinge - like linkage between the flat platform 12 and the cradling platform 14 . additionally , the incline found on the bottom surface 60 of the cradling platform frontal linking arm 58 is opposite the incline found on the top surface 42 of the flat platform rearward linking arm 40 . these opposite inclines allow the cradling platform frontal linking arm 58 to pivot away from flat platform rearward linking arm 40 without damage to either arm . when the watercraft is completely loaded onto the device 10 , the support channels 70 , 94 will keep the watercraft upright , allowing individuals to enter or leave the watercraft . the weight of the watercraft and individuals is supported by the device 10 . the watercraft 10 may be unloaded by reversing the above - described procedure . although the device 10 has been described as containing one flat platform 12 , one cradling platform 14 , and one ramp platform 16 , other configurations may be used . as shown in fig1 , several of each type of platform 12 , 14 , 16 may be used to accommodate an individual &# 39 ; s docking needs or watercraft size . a one - piece embodiment , as shown in fig1 , is also possible . in addition , although the device 10 has been shown with its longitudinal axis oriented perpendicular to the longitudinal axis of a dock 18 , other orientations are possible . for example , the device 10 may be rotated ninety degrees so that the longitudinal axis of the device 10 is parallel to the longitudinal axis of the dock 18 . in such a case , the distance between tethering posts 19 is increased and the posts 19 would pass through bores 20 &# 39 ;, 108 &# 39 ; of several platforms 12 , 16 . the linking pins 112 and tethering posts are sized to fit within each of the platform bores 20 , 20 &# 39 ;, 100 , 100 &# 39 ;, 102 , 102 &# 39 ;, 104 , 104 &# 39 ;, 106 , 106 &# 39 ;, 108 , 108 &# 39 ;. with reference to fig1 , a pictorial view of another embodiment of the present dock assembly 110 is shown . by way of overview , the dock assembly 110 includes a flat platform 112 , a cradling platform 114 , and a ramp platform 116 . the platforms 112 , 114 , and 116 are linked together , providing a floating surface on which a watercraft may be parked . as will be described below , the dock assembly 110 is attached to a rigid dock structure 118 via tethering posts 120 . the tethering posts 120 are secured to the rigid dock by attachment brackets 122 that maintain the tethering posts in a vertical orientation , thus allowing the dock assembly 110 to move in response to wave or tidal action . with continued reference to fig1 , the flat platform 112 is a substantially - rectangular , rigid structure having a horizontal upper surface 124 spaced apart from a horizontal lower surface 126 by a first vertical sidewall 128 , a second vertical sidewall 130 , a vertical front wall 132 , and a vertical back wall 134 . the perimeter of the flat platform 112 is punctuated by securing cavities 136 that extend orthogonally between the upper surface 124 and the lower surface 126 . the securing cavities 136 are essentially - cylindrical , having a uniform cross section throughout . each securing cavity 136 includes a passthrough slot 138 that , as described below , accommodates an insertion plug 140 . the cradling platform 114 is a substantially - rectangular , rigid structure having a horizontal upper surface 142 spaced apart from a horizontal lower surface 144 by a first vertical sidewall 146 , a second vertical sidewall 148 , a vertical front wall 150 , and a vertical back wall 152 . an arched support channel 154 rises upward from the cradling platform upper surface 142 . the support channel 154 resembles a half - pipe which opens upward . to ease loading and unloading of a watercraft , the channel 154 advantageously has a smooth surface to keep sliding friction between the channel 154 and the watercraft to a minimum . the perimeter of the cradling platform 114 is punctuated by securing cavities 156 that extend orthogonally between the upper surface 142 and the lower surface 144 . the securing cavities 156 are essentially - cylindrical , having a uniform cross section throughout . each securing cavity 156 includes a passthrough slot 158 that , as described below , accommodates an insertion plug 140 . the ramp platform 116 is a substantially - rectangular , rigid structure having a horizontal upper surface 160 spaced apart from a horizontal lower surface 162 by a first vertical sidewall 164 , a second vertical sidewall 166 , a vertical front wall 168 , and a vertical back wall 170 . an arched support channel 172 extends upward from the ramp platform upper surface 160 . the support channel 172 resembles a half - pipe which opens upward . to ease loading and unloading of a watercraft , the channel 172 advantageously has a smooth surface to keep sliding friction between the channel 172 and the watercraft to a minimum . near the ramp platform back wall 170 , however , the support channel is tapered to form a ramped entrance 174 . the ramped entrance 174 resembles a three - sided funnel . the entrance 174 serves to guide a watercraft into the support channels 154 , 172 . the entrance 174 also provides an incline along which a watercraft may travel during loading , as it leaves the water , or during unloading , as it enters the water . as a result , the ramped entrance 174 advantageously eliminates the need for a lifting crane to raise or lower the watercraft . the perimeter of the ramp platform 116 is punctuated by securing cavities 176 that extend orthogonally between the upper surface 142 and the lower surface 144 . the securing cavities 176 are essentially - cylindrical , having a uniform cross section throughout . each securing cavity 176 includes a passthrough slot 178 that , as described below , accommodates an insertion plug 140 . as shown in fig1 , adjacent flat platform 112 and cradling platform 114 are linked together by insertion plugs 140 . the insertion plugs 140 are shaped to engage aligned pairs of securing cavities 136 , 156 , 176 . as such , the insertion plugs 140 include a contoured first end 180 spaced apart from a contoured second end 182 by a rectangular middle portion 184 . in fig1 , the insertion plug first ends 180 occupy flat platform securing cavities 136 ; the insertion plug second ends 182 occupy cradling platform securing cavities 156 . the passthrough slots 138 , 158 , accommodate the insertion plug middle portion 184 , allowing the insertion plug 140 to span between the securing cavities 136 , 156 . by using additional insertion plugs 140 , any number of platforms 112 , 114 , 116 may be joined . with additional reference to fig1 and 15b , resiliently - deformable retention tabs 186 extend from the insertion plug lower surface 188 and engage positioning recesses 190 formed in the platform lower surfaces 126 , 144 , 162 . the retention tabs 186 are formed integral with bottom surface 188 of the insertion plug 140 and cooperate with the positioning recesses 190 to prevent upward motion of the insertion plugs 140 . in use , as shown in fig1 b , the insertion plug ends 180 , 182 are fed downward , through the plane of the platform upper surfaces 124 , 142 , and into the securing cavities 136 , 156 , respectively . as the insertion plug ends 180 , 182 are introduced into the securing cavities 136 , 156 , the retention tabs 190 flex inward , away from an equilibrium position , toward the central axis of the insertion plug 140 . as the insertion plug bottom surface 188 travels toward the plane of the platform lower surfaces 126 , 144 , the insertion plug ends 180 , 182 substantially fill the securing cavities 136 , 156 , respectively , and the insertion plug middle portion 184 translates downward within the passthrough slots 138 , 158 . as the insertion plug bottom surface 188 and platform lower surfaces 126 become substantially co - planar , the retention tabs 186 extend out of the securing cavities 136 , 156 and return to an equilibrium position , thereby engaging corresponding positioning recesses 190 . now with reference to fig1 , a capping member 192 prevents unwanted downward motion of the insertion plug 140 . the capping member 192 is removably secured against the insertion plug top surface 194 . in a preferred embodiment , attachment bolts 196 engage receiving nuts 198 that are disposed within the insertion plugs 140 . each capping member 192 is perforated by first bolt apertures 200 that align vertically with second bolt apertures 202 located in the insertion plugs 140 . after the insertion plug 140 is in place and the retention tabs 186 have engaged the corresponding positioning recesses 190 , the capping member is placed against the insertion plug top surface 194 , aligning the first bolt apertures 200 with the second bolt apertures 202 . once the bolt apertures 200 , 202 are aligned , the attachment bolts 196 are threaded into the receiving nuts 198 and tightened in place . in this manner , each insertion plug 140 is locked within a pair of cooperating securing cavities 136 , 156 , with the retention tabs 186 preventing upward plug 140 motion and the capping member 192 preventing downward plug 140 motion . the remaining pairs of adjacent securing cavities 136 , 156 , and 176 are joined in similar fashion . the orientation of the insertion plug ends 180 , 182 , with respect to the securing cavities 136 , 156 , 176 is not crucial : the insertion plug ends are congruent , and the securing cavities are also of uniform size . as a result , each insertion plug end 180 , 182 will fit into securing cavities 136 , 156 , 176 on any of the various platforms 112 , 114 , 116 . with reference to fig1 , 15a , and 16 , three different types of capping member 192 are employed by this dock assembly 110 . for example , the capping member 192 may be a flat plate 193 , as shown in fig1 a , or a cleat construction 195 , as shown in fig1 . the capping member 192 may also be a cradling plug 197 , shaped to match the contours of the support channels 154 , 172 . the cradling plug 193 is inserted , as shown in fig1 , along the seam between abutting cradling platforms 114 and ramp platforms 116 . each version of the capping member 192 includes first bolt apertures 200 . additionally , as shown in fig1 , the platform upper surfaces 124 , 142 , 160 include positioning notches 204 that accommodate the capping members 192 . the flat plate embodiment of the capping member 192 fits entirely within the positioning notch 204 . as shown in fig1 and 17 , the dock assembly 110 is secured to a dock 118 via tethering posts 120 . the tethering posts 120 are attached to the dock 118 by attachment brackets 122 . as shown in fig1 a , each attachment bracket 122 is a two - piece unit shaped to encircle one of the tethering posts 120 . both pieces of the bracket 122 are bolted together , and cooperate to hold a tethering post 120 in a vertically - aligned orientation . in one embodiment , the outer diameter of the tethering posts 120 allows the tethering post to fit within the platform securing cavities 136 , 156 , 176 . however , in an effort to accommodate tethering posts 120 of different sizes , post adaptors 206 are provided , as shown in fig1 . post adaptors 206 are used when the available tethering posts 120 will not fit within the securing cavities 136 , 156 , 176 . with additional reference to fig2 a , each post adaptor 206 includes a top connector plank 208 and a bottom connector plank 208 &# 39 ;. the top connector plank 208 includes a pair of attachment fingers 210 , each shaped to engage a selected securing cavity 136 , 156 , 176 . the bottom plank 208 &# 39 ; is a mirror image of the top connector plank 208 and includes a pair of attachment fingers 210 &# 39 ;. in one embodiment , the post adaptors 206 are secured to a platform 112 , 114 , 116 by inserting attachment fingers 210 , 210 &# 39 ; into dock - facing securing cavities 136 , 156 , 176 . once the attachment fingers 210 , 210 &# 39 ; are in place , the top connector plank 208 and connector plank 208 &# 39 ; are bolted together in a sandwich - style arrangement . the attachment fingers 210 , 210 &# 39 ; each include a stop flange 212 , 212 &# 39 ; that prevents unwanted vertical motion of the attachment fingers and locks the post adaptor 206 in place . when the connector planks 208 , 208 &# 39 ; are bolted together , the top connector plank stop flanges 212 fit into positioning notches 204 , and the bottom connector plank stop flanges 212 &# 39 ; abut platform lower surfaces 126 , 144 , 162 . each connector plank 208 , 208 &# 39 ; includes a post bore 214 , 214 &# 39 ; that accommodates a tethering post 120 . although the present embodiment of the dock assembly 110 includes a flat platform 112 , a cradling platform , 114 , and a ramp platform 116 , other configurations are possible . as shown in fig1 and 18 , the dock assembly 110 may be assembled without a cradling platform 114 or ramp platform 116 . by connecting several flat platforms 112 together , the dock assembly 110 is especially useful as a floating dock to which watercraft may be moored . in this embodiment , resiliently compressible bumpers 214 are attached to boat - facing portions of the platforms 112 . the bumpers 214 include connector projections 216 that positively engage platform securing cavities 136 . once attached to the perimeter of the dock assembly 110 , the bumpers 214 act as a cushion that allows a watercraft to contact the platforms 112 without damage . as shown in fig1 , the dock assembly 110 may also be formed as a single - piece embodiment . the single piece embodiment includes securing cavities 218 that are compatible with the insertion plugs 140 described above . as a result , the single piece embodiment may be used in conjunction with other platforms 112 , 114 , 116 , if desired . the single piece embodiment may be aligned as needed with respect to an existing fixed dock 118 . the watercraft support is manufactured by use of a clamshell mold having an internal cavity in the shape of one of the platforms . a predetermined mixture of polyethylene and an emulsifier is injected into the clamshell mold and the mold is then heated to a first temperature for about an hour . during the heating process , the clamshell is rotated while heating the mold causing the mixture to coat the internal cavity . the clamshell mold is then heated to a second predetermined raised temperature for a second predetermined period of time , causing the emulsifier to produce gas bubbles . rotating of the clamshell mold continues until the mixture is allowed to cool . it is to be understood that while i have illustrated and described certain forms of my invention , it is not to be limited to the specific forms or arrangement of parts herein described and shown . it will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown in the drawings and described in the specification .