o each other. This explanation, which is prOoably thetrue by means of a rack and worm screw, m, which is turned This line of comparison might be much extended, but one, solves the problem completely so far as the drums of either by hand or clockwork. By this the reflector, a, is Various columns are… … that name, has no polishing quality, it has APPARATUS FOR ILLUMINATING AND ENLARGING ment required is accomplished by the screw, been suggested that the color was used simply MICROSCOPIC SLIDES. m. Of course the reflector, a, must be ad- to spread over the joints before trying the justed to reflect…
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