Scientific Papers of the Bureau of Standards

Cover Scientific Papers of the Bureau of Standards
Scientific Papers of the Bureau of Standards
United States National Bureau of Standards
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666; 1895.
*N. S. Kurnakow, Zs. f. Anorg. Chemie, 42, p. 184; 1904.
'^'C. L. A. Schmidt, Chem. Eng., «, p. 80; 1907.
2o8 Bulletin of the Bureau of Standards. I voi. s, No. t.
In practice it has been found difficult to realize conveniently a sufficiently steady motion of the plate in the Roberts-Austen system of recording, and attempts have been made to devise methods in which the photographic plate remains fixed in posi- tion. This has been successfully accomplished by Saladin, whose apparatus
...(Fig. 8, p. 215) has been modified by Wologdine" to give the temperature-time curve by removing the prism M and substituting for the second galvanometer G, a plane mirror turn- ing about an horizontal axis. This mirror may be controlled by an hydraulic system as in Roberts-Austen's apparatus, or by clockwork as in the model constructed by Pellin, of Paris. The deflection of the galvanometer G^ gives to the beam of light an horizontal motion over the plate proportional to the temperature, while the vertical motion of the beam of light is given by the mir- ror turning at a uniform rate, and is therefore approximately proportional to the time as registered on a flat plate.

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