Discuss this Article. They dilated my daughter's eyes 18 hours ago, and they're still dilated. Anyone that says the eyes are back to normal in 6 hours does not know what they're talking about. The job of an eye doctor is not let their patients go blind. Retinal issues are the number one cause of blindness in north america, and most limiting factor of seeing the retina is the size of the pupil.
A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges are shown below.
Layout and Construction of Trusses. 1  1. Lay out the 2 x 6-inch (5 x 15 cm) truss materials on a level area, overlapping the joints. Mark the angles to make the peak (ridge). 2  2. Assemble the roof trusses using the .5-inch (12 mm) plywood that you cut for straps. Nail the straps at the joints on both sides of the trusses with 6 penny nails.