E, fitting into HOWARD'S APPROACH OPENING GATE. catches, F. G is the base, provided with a small guide wheel, H, which steadies the press on the circular cog wheel, I, by moving To continue the subject of lenses, in order < t—> in a smooth way, N. The press can be moved that our readers may fully… … But, if the side of the lens toward the eye The advantages and particular value of ever side a person approaches, cither by the is also convex, as in the figure, the rays, x 1, these gates have been so often expressed in carriage wheel passing over J, of which there x 1, will, in passing out of the…
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