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 83
be without one: its aid is hourly re-quired. There are two forms of these pocket magnifiers ingeneral use ; the most common form is represented by fig. 23, which carries only one or twomagnifiers, whilst a much largerand more convenient form is re-presented by fig. 24, in whichthere are two sets of… … Fig. 24. doublet. A square hole is made in the end of the handle offig. 23, and a round one in the middle of that of fig. 24, whichserves the purpose of attaching them to a stand, as will besubsequently shown. Mr. Smith generally puts three lensesinto one handle, the highest power is a planoconvex,…
Microscopy
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