File:Journal of applied microscopy and laboratory methods (1901) (14783996345).jpg

Identifier: journalofapplied04baus (find matches)
Title: Journal of applied microscopy and laboratory methods
Year: 1901 (1900s)
Authors: Bausch & Lomb Optical Company
Subjects: Microscopy
Publisher: Rochester, N.Y. : Publication Dept., Bausch & Lomb Optical Co.
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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e as easily as if I were sitting at an ordinary table. The camera stand has a connecting rod between its two cast iron supports,just above their feet, and I then suggested that the rod be continued on to thesingle upright of the revolving bench in order to give more rigidity, but was toldthat so low down it would be of no use. After much discussion, it was decidedto have a rod connecting the upper parts of the uprights, and so made that itcould be put up and clamped in at the time of setting up the apparatus. Thisseems a very satisfactory arrangement, undoubtedly adding to the rigidity andhelping to keep the optical bench and camera stand in optical axis. The next difficulty was how to manage for mechanical focusing. When thebench and stand are fixed there is, of course, no trouble, since the focusing rodcan be prolonged under the fine adjustment of the microscope, but where thebench revolves this prolongation of the rod must be got out of the way tempora- and Laboratory Methods. 1367
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1368 Journal of Applied Microscopy HYPO rily while the field is being found. Mr. Bausch asked me how I proposed toeffect this, and I was forced to reply that I had not the least idea, but must leaveit to him. Mr. Patterson, who had charge of the work, came to the rescue witha very ingenious device, which will be described further on. It is, however, always best to avoid mechanical focusing, and be able to reachthe fine adjustment with ones fingers, if possible, especially for the higher powers.In the B. & L. stands that I had hitherto seen, this appeared to be an impossi-bilitv, except within a very limited range, since the arrangement of the bellowswas such that a shorter distance than fourteen inches could not be obtainedbetween the eye-piece of the microscope and the ground glass of the camera. Besides this, the front of the camera was always made the same size as theback, i. e., 11 inches square for a i))2 x8i4 plate, so that the wrist had to bebent round over the front to rea

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