552 



Prof. H. L. Callendar on Electrical 



The curves shown in figs. 5 and 6 are typical records taken 

 with this thermometer on consecutive nights under similar 

 conditions. In the first case there was an unusually rapid 

 rise in the external atmospheric temperature during the 

 night which occasioned some feeling of discomfort. In the 



Ksr. 5. 



3$° 





















37° 



























2><»° 





















/o 



38' 



IX % 4 6 



Rectal Thermometer on Thread Recorder. 

 Fig. 6. 



8 



37?~ 





















1 



36° 

























10 



IX Z 4 6 



Rectal Thermometer on Thread Recorder. 



8 



second case there was a sharp frost, and the patient awoke 

 feeling appreciably chilled. From a comparison of similar 

 records it would appear that the normal temperature of the 

 body may be influenced to some extent, as one would 

 naturally expect, by the external conditions prevailing at 

 the time. There is often a fall of nearly half a degree C. 

 during the night corresponding more or less with the diurnal 

 change of atmospheric temperature. 



The changes here observed cannot have been due, as might 

 appear at first sight, to the effect of change of temperature 

 on the resistance coils of the box or measuring apparatus, 

 because increase of resistance of the balancing coils in the 

 bridge would act in the opposite direction, producing an 

 apparent fall of the thermometer. Moreover, the balancing 

 coil in this particular thermometer was made of fine man- 

 ganin wire having a resistance equal to that of the thermo- 

 meter coil at 37° G.j and was placed inside the celluloid tube 



