Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 123
any voltage from 100 to 250 volts,and on direct or alternating currents. It is troublesome to use alamp of low voltage which requires accumidators, but for thosewho have 6- or 12-volt accumulators suitable lamps can be supplied. 120 THE MICEOSCOPE In the tubular portion connecting the lamp to the… … --51 Fio. 111. -No. 3226, Metallurgical Bench Microscope with prismillumiaator and electric lamp and fittings. Petrologicalmicroscopes. A petrological microscope is essentially an ordinary microscopeprovided with a number of special adjustments and appliancesfor the study of rocks and crystals. The…
Microscopy
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