292 



Mr. H. F. W. Burstall on the Measurement 



It will be noticed that the second set show considerably 

 higher temperatures than the first ; this is due to the fact 

 that the former set were taken just before darkness came on, 

 and the second after the gas-pressure had risen considerably. 

 Owing to this I have generally worked in the morning, when 

 the gas-pressure is generally steady except when there is a 

 sudden fog. 



January 2nd, 1895. 

 Thermometer No. 4. Wire 0*0025 inch diam. 



Circulating water 50° C. 



E before, 0-5216 ohm. 

 R after, 0-5357 ohm. 



R x before, 07153 ohm. 

 R T after, 0'7328 ohm. 



S before, 1-397. 

 £ after, 2-09. 



Percentage of 



Observed Resist- 



pt. 



Temp, on air-scale. 



stroke. 



ance, ohms. 



£=1-74. 



10 



2-474 



998 



1245 



20 



2-455 



988 



1230 



30 



2-366 



942 



1150 



40 



2-306 



912 



1120 



50 



2-248 



882 



1060 



60 



2-128 



820 



970 



70 



2-108 



810 



950 



January 4£/*, 1895. 



Thermometer No. 4. Wire 0'0025 inch diam. 

 Air temperature 10° C. 



R =0-530. R 1 -R =0-1971 



Circulating water 55° C. 



£=1-74. 



Percentage of 



Observed Resist- 



pt. 



Temperature 



stroke. 



ance, ohms. 



on air-scale. 



Explosion 



2414 



956 



1189 



10 



2-483 



988 



1230 



20 



2-439 



965 



1195 



30 



2-356 



923 



1130 



40 



2-338 



914 



1120 



50 



2-256 



873 



1040 



60 



2-184 



836 



990 



70 



2-094 



790 



920 



80 



1-960 



722 



830 



