hen indicated by the knife edge on the drum and may be read offdirectly in x\^th mm. or TSx6rith inch. In other columns is given the proper tube-length for various unadjustable objectives {\, I, i, and fa in.) made by the Bauschand Lomb Optical Company. As the covers are measured the different… … rij-TT mm- may be put in the same box. For example, if one takes TVVmm. as a standard, covers varying j-^ mm. on each side may be putinto the same box. In this case the box would contain covers of TW TTFiT. TTJTJ. Tffff. alld TTFo mm ■ Fig. 122. Zeiss Cover-Glass 3fcas-urer. H ith th is the kn ife…
Microscopy
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