1048, 0.1052, 0.1077, 0.1008, 0.1028, and 0.1104.
Mean 0.1053 = 0 lb. 1 oz. 11 drms.
Add water 1.8947 = 1 " 14 " 4 "
------ - -- --
2.0000 = 2 " 0 " 0 "
This was the value used. The instrument, being put on delicate coin
scales and counterbalanced, weights equal to 1.8947 lb. avoirdupois = 1
lb. 14 oz. 5 drms., were added to the counterbalancing weights, and cold
water was poured in until the scales again balanced.
The pyrometer with its contained water was then just equal in heating
capacity, while the temperature was not above 38 deg. F. to two pounds of
cold water. The two instruments were sensibly alike, but were numbered
No. 1 and No. 2, and at each observation the one used was noted.
The process of preparation and testing appears long and tedious, and
is indeed somewhat so; but the instruments once well made are durable,
convenient in use, and with care reasonably accurate.
Compared with mercurial thermometers between 212 deg. and 600 deg. F., I believe
them to be much more accurate, although less convenient.
For a range of temperatures from 212 deg. to 900 deg.
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