Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 190
gle to the horizon, by the revolutionof the horizontal tube to which it is attached, around the otherhorizontal tube which projects from the stem ; by the sliding of oneof these tubes within the other, again, the horizontal arm may belengthened or shortened ; the lens may be secured in any… … Condensing Lens. 136 ACCESSORY APPARATUS. and finally the horizontal arm is attached to a sprung socket,which slides up and down upon a vertical stern. The optical effectof such a bulls-eye differs according to the side of it turnedtowards the light, and the condition of the rays which fall upon…
Microscopy · Biology
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