Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 102
T^a q?—No 3211, Standard London Microscope, with screwiocLing B^S-out substage, dust-tight double nosepieoe. 98 … j^Q. 94._No. 3213, Standard London Microscope, with rack andpinion and centring swing-out substage, triple nosepiece, mechanicalstage. 99 100 THE MICROSCOPE an iris diaphragm. In the upper cell of this a small Abbe con-denser can be fitted, and also a series of patch-stops or a colouredor ground…
Microscopy
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