was the case in the previous illustration. to each other. This explanation, which is probably the true 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… … that name, has no polishing quality, it has ment required is accomplished by the screw, been suggested that the color was used simply m. Of course the reflector, a, must be ad- to spread over the joints before trying the justed to reflect the light through H, parallel stones together. If any…
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