Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 311
collar, is to be avoided. The best plan without doubt is to attach the speculum to a fixedpart of the stand, as is done in the Powell and Lealand, the Ross,and the Beck stands. A modification of the parabolic reflector teas devised by Dr. Sorby,and has proved to be very useful in certain… … front, is placed a small plane reflector which covers half of theobjective, and throws the light directly down upon the object andback through the other half. It is shown in fig. 236 with thecylinder in place, and in the dotted lines with the same turned out.This arrangement allows of two kinds of…
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