The microscope; an introduction to microscopic methods and to histology by Gage Simon Henry 1851-

Author:Gage, Simon Henry, 1851- [from old catalog]
Language: eng
Format: epub
Tags: Microscopy
Publisher: Itahca, N.Y., The Comstock publishing company
Published: 1925-03-25T05:00:00+00:00

Fig. 132. Micrometer Calipers {Brown and Sharpe). Pocket Calipers^ graduated in inches or millifneters, and well adapted for measuring cover-glasses.

It is then strongly recommended that every preparation shall be covered with a cover-glass whose thickness is known, and that this thickness should be indicated in some way on the preparation.

I 241. Cover-Glass Measurers, Testers or Gauges. For the purpose of measuring cover-glasses there are three very excellent pieces of apparatus. The micrometer calipers (Fig. 132) used chiefly in the mechanic arts, are convenient and from their size easily carried in the pocket. The two cover-glass measurers specially designed for the purpose are shown in Figs. 133-134. With either of these the covers may be more rapidly measured than with the calipers.

With all of these measures or gauges one should be certain that the index stands at zero when at rest. If the index does not stand at zero it should be adjusted to that point, otherwise the readings will not be correct.

As the covers are measured the different thicknesses should be put into different boxes and properly labeled. Unless one is striving for the most accurate possible results, cover-glasses not varying more than 0.06 mm. may be put in the same box. For example, if one takes 0.15 mm. as a standard, covers varying 0.05 mm. on each side may be put into the same box. In this case the box would contain covers of 0.12, 0.13, 6.14, 0.15, 0.16, 0.17 and 0.18 mm.

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