226 L. Waldo—Papers on Thermometry. 
Art. XXIX.—Papers on Thermometry from the Winchester 
Observatory of Yale College; by LEONARD WALDO. 
| Continued from page 61.] 
THE observation of the freezing point of “ Kew 585” for 
Nov. 2d, is not entitled to the weight of the ones made Dee. 
1st because it was made by the eye alone, while the readings 
for Dec. 1st depend on the cathetometer. . 
We may assume therefore that the constants of these stan- 
dards for the present are as follows: 
. Kew 578. Kew 584. Kew 585. 
oe 
Correction at the permanent freezing 0°-00 40°10 F. 0°-00 
ag ites tng Rie SER aga lea 
Se 
Correction at the boiling point......-. | +0°-03 0. | +0°20F. | +0°14 C. 
Depression of the freezing point after an 0°°18 C. 0°°25 F. 0°22 0. 
exposure to the boiling point _.-~- 
shone ee 
These are the constants which have been inserted in the — 
formule for computing the corrections to the Kew thermometer 
readings. I shall now investigate the constants of the ther 
mometers similar to the standards of the ‘ Kaiserliche Normal- 
Hichungs-Kommission” and which have been carefully com 
pared with these standards through the kindness of Dr. Foerster 
in Berlin. These thermometers were made by R. Fuess, and I 
cannot better describe them than by giving their dimensions In 
es following table and then adding a free translation Irom the 
* Bericht tber die wissenschaftlichen Instrumente auf der 
Berlin Gewerbeausstellung im Jahre, 1879,” pages 218 and 214. — 
Designation. R. Fuess, Berlin, 89. | R. Fuess, Berlin. 50. 
eos lL ree 
How graduated — 6° to +105°C.|— 2° to + 105°C. 
ngth of 1° . 4°05 ™™ 
Smallest graduation 0°: ie 
ngth of tube. 650 ™m 513 =" 
tside diameter of tube ._..___. __ 12. mm 12 ™m™ 
Shape of bulb ----| Cylindrical. Cylindrical 
12 
Diameter SUR SSRN AR Ran mem pce | 5-5 mm 55 mm 
ad * % = * * * 
‘“* Fuess has succeeded in devising a construction for ther- 
mometers which is free from all those imperfections, and com- 
