L. Waldo— Papers on Thermometry. 445 
and the Kew standards ‘Kew 578” and “Kew 584” was 
made. The usual spree is were taken to arrange the ther- 
mometer readings so as to them from the effects of com- 
parator radiation, ne after aottecliais the observations for their 
known errors of calibration and zero points, the Fuess and 
Tonnelot readings were subtracted from the Kew readings and 
from the residuals thus obtained a curve was drawn from 
which the i pec corrections were obtained, ccorenol in 
Centigrade degrees 
Siege depending on the glass and the thermometer construction) ‘hag imecd 
ce the Fuess and Tonnelot standards to the Kew standar 
A A A A 
Fuess 89 and = Tonnelot 2584 and Fuess 89 and Bi tn oe 2584 and 
Reading. Fuess 50. Tonnelot 2585. Reading. Fuess 50. nelot 2585. 
0° “00 55° —0° at 
5 0°02 0°00 60 —O0°19 0°28 
10 —0°03 00 65 —0O17 —0°28 
15 —0°05 —0°02 70 —O°15 —0°27 
20 0°07 0°05 75 0°14 0°26 
25 —0°09 —0°09 80 —0°12 —0°25 
30 —O°1l —O'11 85 —0°10 — 0°22 
35 —0'13 —0°14 90 —0°0T —0°19 
40 0-15 0°17 95 0°05 0-09 
45 —O1T —0°20 100 0°00 0°00 
50 —0°19 —0°22 
T ha 
land, of the Johns Hopkins ppd the notes of compari- 
son made between Kew 584, Fuess 50, Tonnelot 2585 and the 
standards of his laboratory, Baniin 6163, Baudin 6165, Baudin 
vam be rae by: include thirty-one intermediate points by the insertion of another 
* é, 
P erouia take the hecemndahce:t oe of tl tl 
eter “Tonnel lot 2585,” which is gr it’s scale fr g 
the boiling points and has 1°= — ‘The columns marked /; and / contain — 
lengths of the three mae of mercury at the respectiv e places in the therm 
eter tube indicated by a, b, b’, and ¢, c’, c’, c’”’: of course J, merely indicates that 
it is the upper column and has a value at shout 89°, 43° and 24° successively. | 
333, +3 
3 
f the thermom- 
Hh Cus z 7 
1, = 000 =0°'000 at 32°0F, 
24 =89°190—89°-220,:. a= —0°-015 and Aa= a=" 904 — Nae 018 =+°012 at 54°5F. 
26 = 42-743— 42°752  b=— 0-005 and As, = —-008—-005 =—'013 at 77-0F. 
20’ = 42-700— 42.720 b’=— 0-010 and Ais = =— ae 002—-006 =—-020 at 99°5F. 
f¢ = 23°630— 23°593 c—+ 0°018 and AY 8 = =— ‘O15 at 122-°0F. 
2c’ = 23-600— 23-613 Ae — 0°006 and Rees sae 002 = —-009 at 144°5F, 
2c” = 23-620— 23°617 c’= + 0-002 and Aiz=—*008—"010 = —'018 at 167‘0F, 
2¢”"= 23-600— 23-612 pam — 0°006 and ruses 004—'005—-006 =—-015 at 189-5F. 
0-000 0°000 at 212-0F. 
The Tonnelot thermometers referred a were made in Se ge 1879, and mes a 
graduation em, ing from + 5° to + 230° F, with about 1°8™™ to 1°. They 
divided to 0°-5 F. re a total length of fob 455™™ with cylindrical bulbs sat 
wee long. They Se calibrated and are otherwise highly creditable 
to their maker, Tonnelot of Pan 
