L. Waldo—Papers on Thermometry. 229 
After we had received these thermometers we made the 
following determinations of the freezing point corrections: 
Date. Fuess 50. Fuess 89. 
1880. Sept. 21 — 0°20 — 0°:40 
28 — 0°40 
Oct. 16 — 0°20 — 0°40 
28 — 0°45 
Nov. 25 — 0°20 — 0°43 
from which it will be seen that the thermometers are slowly 
Increasing their freezing point readings with time. We may 
assume the following as the corrections at the dates given. 
a 
Date. Fuess 50. Fuess 89. Kew 578. 
1880. June aa Wf — 0°35 0°-00 
Sept. — 0°18 — 0°37 0°00 
Nov. — 0°20 hoe AT 0:00 
The thermometer Fuess 50 had a part of its upper scale 
support (the front lip of m in the figure) broken in coming 
from Germany. This does not affect the accuracy of its read- 
ings, I think, but in order to obtain a comparison up to 40° C. 
between a Kew and a Fuess standard I have chosen the ther- 
mometer Fuess 89, which reads to 0°°1 and is in excellent con- 
dition, and the Kew standard 57 8, of which the errors are 
extremely small. 
In the following comparison the readings have been freed 
m the zero and 100° point errors, as well as those arising 
Date. Fuess 89. Kew 578. F. 89 — K. 578. 
ee 
1880. Sept. 28 10°67 C. 10° -62 C. + 0°05 C. 
21 10°81 10°75 + 0°06 
28 16°24 16°09 + O15 
21 21714 21:00 + 014 
28 21°36 21°20 + 0°16 
Oct, 28 21°80 21°64 + 016 
21°81 21°66 + O15 
Sept. 21 24:21 24°03 + 018 
28 26°60 26°45 + O15 
21 31°66 31°50 + 0°16 
8 32°17 32°00 + O1T 
Oct. 28 32°67 32°50 + O17 
8 33°31 33°15 + 0°16 
Nov. 26 34:08 33°90 + 018 
26 34°21 34:00 + 0°21? 
Sept. 28 37°31 3715 + 0°16 
28 42°40 42°25 + 0°15 
