Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 162
one into the other,more stiffly thanis convenient) bymeans of a tight-ening coUar milledat its edges; and finally the horizontal arm is attached toa spring socket, which slides up and down upon a verticalstem. The optical effect of such a lens differs accordingto the side of it turned towards the… … Bulls-Eye Condenser. 140 ACCESSOET APPAEATTJS. when used by dayliglit, its plane side should be turnedtowards the object; and the same position should be given toit, when it is used for procuring converging rays from a lamp,the lamp being placed four or five times farther off on oneside, than the…
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