Transactions of the American Philosophical Society . ,5 36,0 36,3 38,3 3 37,5. Micrometers. On the Iron. On the Brass. 42R + 20. 47R + 106. At half past 6 oclock, returned to the apparatus, adjusted thelevels again, and made the following readings. Thermometers. 13 3 4 ? ,2 — 36,5 36,3 5 37,33. Micrometers. On the Iron. On the Brass. 42R + 383. 47R+H4. The day being cold, I could not expect to raise the heat inthe box to the temperature of boiling water. I concluded, TTROMETER II. 12 % MADE AT NEWARK, NEW JERSEY. 217 therefore, to make only an intermediate observation, at t
Transactions of the American Philosophical Society . ,5 36,0 36,3 38,3 3 37,5. Micrometers. On the Iron. On the Brass. 42R + 20. 47R + 106. At half past 6 oclock, returned to the apparatus, adjusted thelevels again, and made the following readings. Thermometers. 13 3 4 ? ,2 — 36,5 36,3 5 37,33. Micrometers. On the Iron. On the Brass. 42R + 383. 47R+H4. The day being cold, I could not expect to raise the heat inthe box to the temperature of boiling water. I concluded, TTROMETER II. 12 % MADE AT NEWARK, NEW JERSEY. 217 therefore, to make only an intermediate observation, at thetime I should find the thermometers the most equal. About 7 oclock in the evening, I made the following obser-vations. 2 3 4 } Mean. 52°,0 52°,0 51°,7 53°,0 5 52,2. Micrometers. On the Iron. On the Brass. 4lR + 42,5. 45R + 91. Though I had at the outset doubts upon the admissibility ofmaking observations in the intermediate steps of the risingand falling of the temperature, I still tried it; but found thatno coincidence of the thermometers above and below couldbe obtained, near enough to allow a mean to be taken, exceptwhen the temperature in the box was either at the highestdegree I could bring it to, or cooled down to the temperature ofthe surrounding air. To procure this equality of temperatureis the principal difficulty in this kind of experiments: Forthe sensibility of the levels to the expansion and con-traction of the iron and brass, is so great, that a change oftempera
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