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 51
ed witha separate mi-croscope, of theform shown byfig. 12. A, Brepresents apiece of brass tube, about an inchlong, and an inch in diameter, whichis provided with a cap at each extre-mity, the one at A carries a smalldouble convex lens of half an inch infocal length, whilst the one at B car-ries a… … Fig. 13. THE MICROSCOPE. 17 the cap A and by the silver cup or speculum /. Infront of the lens is the speculum /, which is a quarterof an inch thick at its edge, and whose focus is abouthalf an inch, and in front of this there is a disc of metal cthree-eighths in diameter, which is connected by a…
Microscopy
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