e all acquire observing habits, for they forty, they begin to experience a change in through the rods, N. The hooks, Q, are con- erected standards, K, with capping pieces, L, will be always with you, and ever ready to sight. During the progress of this alteration, nected with the endless chains, H,… … calculated to advance. the true rule is to commence the use of glasses Every number of the SCIENTIFIC AMERICAN contains eight pages of reading matter, abundantly as soon as we can see better with than without chains, R, are to be anchored to steady the collars secured by set screws to the rods, N,…
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