24 



RATIO OF SPECIFIC HEATS. 



EFFLUX TIMK 



1. SFC. . 



Ai'kiL 2S, iS()4. 



Thermometer. 



.7.31° c. 



The peiiotl ut' quiescence of the galvanometer needle proved at the [H'essure 

 35.50 to be quite one second. 



We may remark that the ol)server at the galvanometer was not instructed as 

 to the height of the pressure excess which the second observer pi-oduced. The 

 same observer simultaneously kept the temperature of the watei- l)ath at the 

 desired value. 



C. TEMPERAIUKE DISTRIBUTION IN THE WATER BATH. 



Finally we wish to give a brief summary of the bolometric measurements made 

 lelative to the distribution of temperature within the water V)ath (cf. page 5). 

 The mean temperature of the bath in the lapse of time was kept constant in the 

 manner specified above, to the degree given in the fii'st column of the following 

 table. The second column shows the deflection of the galvanometer needle in scale 

 parts, obtained for suitable i-esistauce ratios in the respective bi-anches t)f tiie 

 Wheatstone bridge. The third column contains the time of observation. We 

 adduce thi-ee series of observations : in the first and third the bolometer was near 

 the surface of the water in the bath, while in the second it was near the bottom. 



Temperature. 



15.70° c. 

 15 70 



'5-7° 



'S-70 



15-70 

 15-70 

 15.69 



15-70 

 '5-70 



Deflection. 



105.0 

 104.0 

 104.0 

 103.0 



Time. 



Bolometer. 



104.0 

 105.0 

 103.0 

 106.5 

 105-5 



above 



below 



53"' 

 58 



above 



The sensitiveness of the method is particularly seen in the following table 

 of collateral d.ifa. 



