Tables 235, 236. 



COMPARISON OF THERMOMETERS.' 



Chappius gives the following equations lor comparing glass thermometers : 



iooo(7',v- 7-/,) = . 00543 ("oo- 7-„) •/■„+ 1.412 X lo-Mio"'- /■„') 7'„- 1.323 X 'o-' (too«- ■/•,») T^, 



1000 ( r<7(>, - 7'tf)= -0359 ('oo- rj 7-„— 0.234 Xio-«(ioo>- r„») y^- 0.5.0 x lo-'Cioo"- 7-,»)r,. 



A'':^ nitrogen ; H=. hydrogen ; CO^ = carbon dioxide; m ■=. mercury. 



TABLE 236. — Hydrogen Thermometer compared with others. 



This table gives the correction which added to tlic ilicriiiiiiiictcr rcidiiig gives llic teiii]" ratnrr by the hydrogen 



thernioiiieter. 



TABLE 236. —Air Thermometer compared with others. 

 This table gives the correction which added to the thermometer reading gives the temperature by the air thermometer. 



Temperature 

 by air 

 thermome- 

 ter. 



-20 



-10 



O 



10 



20 



30 

 40 



5° 



60 



70 



Z3 

 80 



82 



90 



TOO 



no 



120 



Mercury in 

 Thuringian 



glass 



thermometer 



(Grommach §). 



+0.03 

 +0.02 

 0.00 

 —0.03 

 — O.I I 



— o.oS 

 — 004 



06 

 ,04 



Mercury in Jena 

 glass thermome- 

 ter (Wiebe and 

 Bottcherll). 



+0.153 

 +0.067 

 0.000 

 —0.049 

 —O.oS 3 

 —0.103 

 .1 10 

 .107 



.096 

 •.078 



-0.054 



-0.028 



0.000 



.0-? 



Temperature 



by air 

 thermome- 

 ter. 



1.05 



130 

 140 

 150 

 160 

 170 

 180 

 190 

 200 

 210 

 220 

 230 

 240 

 250 

 260 

 270 

 2S0 

 290 

 ^00 



Mercury in Jena 

 glass thermome- 

 ter (Wiebe and 

 Bottcherll). 



3.07 

 1.09 

 — O.IO 

 — O.IO 

 —0.08 

 —006 

 — 0.02 

 +0.04 

 +0.1 1 

 -I-0.2I 



+ 0.32 

 + 0.46 

 + 0.63 

 +0.82 



+ I.OS 



+ 1-30 

 + 1.58 

 +1.91 



Temperature 

 by air 

 thermome- 

 ter. 



—5 

 — 10 



—15 

 — 20 



—25 

 —30 



—35 

 —40 



—45 

 —50 

 —55 

 —60 

 -65 

 —70 

 —So 

 —90 

 — 100 



Baudiii alcohol 



tlurmometer 



(.W hitc U). 



0.000 

 .144 



.3S2 



.704 

 — 1. 100 



— 1-5^'3 

 — 2.0S2 

 — 2.64S 



—3-53 



-3.SS7 



— 4-54I 

 — 5.206 



— 5-''72 

 —6-531 

 — 7-174 

 —8.371 



—9-392 

 — 10.16^ 



1872. 



* These two tables are taken with some slight alteration from Landolt and Boernstein's " Phys. Chem. 

 t P. Chappius, "Trav. et M^m. du Bur. intemat. des Poids et Mes." vol. 6, 1888. 

 t Marck, "Zeits. fur Inst.-K." vol. 10, p. 283. ..^ ^ „ o 



§ Grommach, " Metr. Beitr. heraus. v. d. Kaiser. Norm.-Aich. Comm. •«— 

 II Wiebe und Bottcher, " Zeits. fur Inst. K." vol. 10, p. 233. 

 t White, " Proc. Am. Acad. Sci." vol. 21, p. 45. 



Smithsonian Tables. 



229 



Tab.' 



