446 LL. Waldo—Papers on Thermometry. 
7316, and Kew 104, which afford the means of expressing the 
three first named thermometers in terms of the air thermometer 
‘observations and referring each thermometer to Rowland’s 
absolute scale* a combination of the Yale and Johns Hopkins 
comparisons gives as a probable value of the relation between 
these standards and the air thermometer, the following system 
—, of corrections to be applied to the Kew, Fuess and 
Tonnelot standards respectively. 
@ 
Reading. Tonnelot 2535. Fuess 50. Kew 584. 
0° 0°-00 0°-00 The curve for this ther- 
—0-02 —0°03 mometer shows slight ir- 
10 — 0°03 —0°05 regularities on both sides 
i 15 0°05 —0°08 of the absolu a 
as 20 —0:07 —0:10 no case giving a correction 
- 0°09 0713 exceedin. 0° if 
30 —0'11 —0°15 generally within —0°-02 
35 —0°13 —O17 ©. of it. Since to adopt 
40 0-15 0-18 these corrections would 
45 —O17 —0°19 imply that Jolly’s air ther- 
50 —0°19 —0°21 mometer i correc 
55 — 0°20 —0°21 indications to 01™™, 
ozs 60 —0°21 — 0°20 consider th parison 
65 0-20 — 0°20 as uncertain, and assume 
70 —0°20 —019 that Kew 584 ha mall, 
7b —0°18 —017 ndete neg e 
80 017 —014 correction to reduce its 
f 85 —0'14 0:12 readings to the absolute 
90 +011 —0-09 scale between +25° and 
95 —0°05 —O0°05 +75° C. 
100 0°00 0-00 
filling. When filled the tube ¢ is sealed in the 
blow-pipe flame. The capillary 6 ends in a barom- 
eter tube d, 5™ in length, at the lower end of which a 
rubber tube forms the connection with a long barometer tube, 
fe, of the same glass as d. Tube / e projects through an 
motion in a V-shaped trough in which it is held by springs. Its 
. vertical motion is communicated by the hand of an assistant. 
* Vid. On the Mechanical Equivalent of Heat. Proc. Am. Acad., Bost., 1880, 
p. 115. 
* 
