THERMOMETERS. lv 
the abstracts of results, the reading of the wet bulb has been considered the same 
as that of the dry bulb. 
91, In January 1843, a series of comparisons of different thermometers, in water 
of different temperatures, was made with a standard thermometer by NEwMAN: 
the results are given in the Introduction for 1843, Table 23, p. lvii. The readings 
of the standard, and the dry and wet bulb thermometers, in a mixture of pounded 
ice and water, at the time of the comparisons in 1843, and in 1845 and 1846, are as 
follow :— 
Jan. 7, 1843. NEWwMAN’Ss standard, 32°00. Dry bulb, 32°7. Wet bulb, 32°6 
102) jug fe) ol {3/25 oe ee ee Oo Oere eceeseaee Sigel a Maan hae 32°65 
Heb VMSHUGEG IT oo... tv esc te teen cteanee Seal 7280 Ae O27 Oa ee ece as 32°°7 
Dec aiSates sem pried lovl ubtoigew DA crowns. O298) Did, es. 32°7 
It appears, therefore, that the index errors of the dry bulb thermometer were 
about two-tenths of a degree greater in 1845 and 1846 than in 1843, and the index 
errors of the wet bulb, about one-tenth of a degree greater; making allowance for 
this change in Table 23, Introduction for 1843, we obtain 
TasLE 11.—Corrections of the Dry and Wet Bulb Thermometers to the 
Temperature by NEwMan’s Standard, in 1845 and 1846. 
Corrections. Corrections. 
On December 18, 1846, the standard and dry and wet bulb thermometers were 
compared in water :— 
Standard, 58°:8. Dry bulb, 59°3. Wet bulb, 59°1. 
Correcting the standard reading for its index error of 0°1, the corrections for 
the other thermometers near 60° are 
Dry bulb — 0°6. Wet bulb — 0%4. 
The following corrections were obtained from comparisons with the standard in 
the external atmosphere :— 
1845. Jan. 30, The correction for the dry bulb thermometer at a temperature of 1°5= —0°3. 
1846. June 3. The correction for the dry bulb thermometer at a temperature of 82°5= —0°15. 
