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A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)

Quekett, John, 1815-1861 · London, H. Bailliere · leaf 236

An illustration from A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures, 1848, leaf 236 — ns [are then read off as easily as the inchesand tenths on a common rule. The operation, indeed, isnothing more than laying a rule across the body to bemeasured; and it matters not whether the object be trans-parent or opaque, mounted or not mounted; if its edges canbe distinctly seen, its diameter… … Fig. 129. 13* 196 USE OF THE MICROSCOPE. The cobweb micrometer, the invention of Ramsden, isrepresented by fig. 128; it is composed of a positive eye-piece (fig. 91), in the focus of the upper or eye-glass ofwhich two very fine parallel wires, or cobwebs, are stretchedacross the field; one of these…

Microscopy

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