Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 175
ch it lies, and (2) by its position in that block.( Journ. of Eoy. Microsc. Soc, Vol. iii., 1880, p. 750).—To those who preferthe simplicity given by the numbering of each square in the Maltwood finder,the Author would suggest that the object maybe always found by it withthel-4th Objective; and… … Collinss Graduating Diaphragm,jective of l-4th inch or any In another form, introduced by Mr. Collins (Fig. 72), four shutters are made to move inwards simultane-ously, by acting on a lever-handle, soas to narrow the aperture, the shapeof which always remains more nearlycircular than square. Aud in…
Microscopy · Biology
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