Bubble level device, attachable to the grip of a golf club
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The crowded-field of accessories incidental to the typical golf club. 
     SUMMARY OF THE INVENTION 
     The game of golf might be described as energy measurably transferred to a golf ball, as projected to produce a horizontal and vertical result of the ball. Technically, gravity is a golfers&#39; singular, immediate reference to the vertical when addressing a golf ball. Conditioned &#34;Plumbing-Up&#34; is currently effected per &#34;Eye Drills&#34; that are a repetitive, practiced and mental retention of the visual trajectory of a &#34;free-dropped&#34; golf ball. Self-confidence sometimes disappears during &#34;squaring-up&#34; to &#34;address-the-ball&#34;--i.e., stance, face-sole/shaft-angle/swing-plane, trajectory projection, etc. 
     The instant invention avails a more natural orientation to &#34;correct&#34; swing/plane mastery. As a training aid, the instant invention serves to assist those less-than-perfect golfers. 
     The instant invention is fixable to the end face of the typical hand grip of a golf club. It has a near-capacity liquid-filled, transparent dome to reference a given club-shaft/swing-plane angulation (of a driver, a putter or etc.) as so specifically offset to the vertical. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 depicts a sectional view of the instant invention, optionally attached per seizeably-constrictive, force-fitted, insertion into the grip end face vent aperture of a barbed stem anchor portion, formed to centrically depend from the planar undersurface of the dome floor. Selected, plural, complementary, incidental, radially-projected, frictional enhancement appurtenances are optional to augment seizure of the stem. Alternate securement is per complementary adhesion of dome underside to hand grip end face. 
     FIG. 2 suggests a correlation of a given club-shaft/swing-plane/face-sole. The index void of the liquid mass content is shown as bisected &#34;on-point&#34; by an angularly-referenced, horizontally-arcing, inscribement of the dome. 
     FIG. 3 departs the description of FIG. 1 only as practically altered to accommodate sleeved attachment to the atypical hand grip. With the device seated, the sleeve is constrictively rolled down into place. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Sized-to-function, a domed vial 10, filled near-capacity with complementary liquid 8 and made of a rugged, clear, scratch-resistant, thermo/blow-formed, semi-elastic poly plastic. The underside of its floor is optionally deformable to have a centrically-depending, typical barb-like 13, self-anchoring stem 14 and to be shock-resistantly, seizeably friction-fitted, snap-fastened or screwed into the end face vent aperture 22 of a typical golf club hand grip 20. Accordingly, a mounting means comprises a protruding stem 14 having at least one barb 13 with said stem projecting from a bottom surface of the dome vial 10. The stem is capable of being inserted into a vent hole 22 of handle grip 20 of a golf club such that the barb resists its removal. Alternate attachment is per appropriate adhesion 12 directly onto the grip end face. 
     A typical hand grip mounting conditions might prescribe a transparent, constrictively-elastic, fixedly-seating sleeve 15 for a rolled-down encompassment of the domed vial portion and the free end of said hand grip 20 to be interlocked as one. 
     Once manufactured and liquid filled 8, the prescribed angular orientation (i.e., putter, driver, etc.) is referenced per a concentrically-arcing, horizontal dome inscription 6, to bisect the indexing void 4 formed within the liquid 8. Alternatively, a flourescent, buoyant matter, that is different from liquid content may be used in place of the void. A reference indicia inscribed on the dome vial whereby the index void moves freely within the liquid and can be oriented with respect to the indicia by varying the position of the golf club. Secondarily, absent such inscription, plumb/90&#39; is coincidentally referenced per concentric circumscribement of the filler aperture 2 by index void 4. 
     Visual reference aside, the index void 4 within the liquid mass 8 is compressible, the liquid mass 8 is not compressible. As relates to shock absorption and simple expansion/contraction exposure, much golfing equipment is repetitively subjected to severe air cargo hold temperature, atmospheric pressure fluctuations, and typically slammed around until back-at-home. 
     All other appropriate procedural preparations are presumed, i.e., club selection, stance, intended trajectory, etc. Immediate to backswing, the player visually coordinates an intended swing plane angle per orientation of the indexing void 4, as-referenced 6 to the axial centerline of the shaft--all, as complementary of an optimally &#34;correct&#34; swing/plane angle, per a given golf shot. 
     Pre-swing orientation should prescribe consequence--&#34;correct&#34; address-of-the-ball depends to a specific shaft/angle, horizontal/vertical relationship. Club balance, as relates to handling, is unaffected by the attachment of the instant. Upon simple installation, the instant precludes years of uninstructive, frustrating miss-swings toward acclimating the self-confidence of a shaft angle/swing plane which is automatically served up by the instant invention with every stroke, as a matter of course. 
     Constancy is per practiced visual/sensory conditioning. Concentric circumscribement of the filler aperture by the index void of the liquid mass coincidentally describes shaft plumbness--absent any referenced inscription upon dome. 
     Field-use may dictate proportional adjustment of components. Per the claims appended, alternate applications may be conceived. Eventually, for example, micro-chip technology might beep/flash this same information.