561 



TABLE IV. Paper removed from posterior side. 



Velocity in feet Rise, of temperature in Rise divided by 



per second. divisions of scale. square of velocity. 



75-6 60 -0105 



96-8 87 '0093 



On whirling in the contrary direction, so that the naked part of 

 the bulb went first, we got, 



TABLE V. Paper removed from anterior side. 



Velocity in feet Rise of temperature in Rise divided by 



per second. divisions of scale. square of velocity. 



81-7 56 -0084 



93-8 72' -0082 



On rotating with the bare part, posterior and anterior in turns, at 

 the constant velocity of 90 feet per second, the mean result did not 

 appear to indicate any decided difference of thermal effect. 



Another quarter of paper was now removed from the opposite 

 side. Then on whirling so that the bared parts were anterior and 

 posterior, we obtained a rise of 83 divisions with a velocity of 93'8. 

 But on turning the thermometer on its axis one quarter round, so 

 that the bared parts were on each side, we found the somewhat 

 smaller rise of 62 divisions for a velocity of 90'8 feet per second. 



The effect of surface friction having been exhibited at slow velo- 

 cities with the papered bulb, we were induced to try the effect of 

 increasing it by wrapping iron wire round the bulb. 



TABLE VI. Larger bulb Thermometer wrapped with iron wire. 



Velocity in feet Rise in divisions Rise divided by 



per second. of scale. square of velocity. 



15-36 10-25 -0434 



0623 



0324 

 0206 

 0149 

 0129 

 0118 



* The whirring sound began at this velocity. According to its intensity the 



