228 L. Waldo—Papers on Thermometry. 
easily read and in the certainty with which the eye may 
so placed that the readings have no sensible parallax. Th 
seem to leave little to be desired unless it be calibrati 
these standards. These results are reduced to latitude 46°, 
barometric pressure of 760mm. and to the level of the sea. 
Correction atthe | Correction at Preexing Point 
Date. Thermometer. after expos —. the, Boiling ee ‘ r exposure 
oc 
eee 
1880. June 4; Fness 50 — 0°':163 Bu So ---- 
8 ne — 0170 
8 “ oes — 0°-035 + 0°°145 
1% a Pies 0-012 + 0°135 
17 " ‘ — 0011 + 07135 
Sept. 17 os — 018 pace eorc 
June 4; Fuess 89 — 0°334 ioe —- 
o 0°347 ‘ aaa 
f ° — 0°027 0-000 
1 “ ae a — 0°023 — 07005 
] “ = : — 0047 — 0°023 
Sept. 1 : — 0°37 Bate i ee 
And Dr. Feerster further finds that the depression of the freed: 
ing point after an exposure to the boiling point is for 
ha 50 = 0°°35 C. 
3 89 = 0°32 C. 
Dr. Foerster made a on sine werent of the cornea 
to be applied to the Fuess thermometers owing to the errors © 
calibration for each consecutive aie These tabular correc- 
tions are computed for a freezing point of +0°°37 in the case 
Fuess 89 and of +0°18 in the case of Fuess 50. 
report of which Professor nein Sig eS ear Ae an ana 
Sa sping of 1877 a thermometer was injured, in the calibration and compa 
of which much trouble had been taken, and Dr. Pare, ores was then ace 7 
the Commission, became quite interested in this question. He attempted to 0 ted, 
ing i ce 
idea, not to fasten the — directly, but only to place it immovably in & firm 
poem lace. Later h ee = idea without th 
ment, by & sonetisselicn made entirely of g The use of platinum th 
st — for the capillary tube on the other = is an invention of Dr. Pi race” 
LL, Loewenherz. 
