Micrographia : containing practical essays on reflecting, solar, oxy-hydrogen gas microscopes; micrometers; eye-pieces, &c. &c. (1837)
Goring, C. R., 1792-1840, Pritchard, Andrew, 1804-1882, joint author · London : Whitaker and Co. · leaf 213
nstructed in Turkey, on a similar principle, by Mr.W. H. Barlow.* Mine differs from that gentlemans, however,in two material respects : 1st, I am enabled to dispense with avast proportion of the water requisite for his apparatus ; and,2dly, by substituting weights in the place of water, I give it*… … a cylindrical vessel composed of copper or tin, and connectedat the bottom to a small cylinder in the situation of B. Athird cylinder, D, of equal length with A, and about threeinches less in diameter, is so placed within the vessel A thatit can be moved up and down with perfect freedom, and…
Microscopy
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