N-llftKj 



44 



M 



Machine. 

 Tttrttx Co?'.+ 

 SI tot or lead 

 Bottom 



Bottom tiiiifivvaturv 

 No, of thermometer 



Cufrvri f ti h itfprrof iwr 



Mr 



Trt'tr! 



Depth 



Cor. 



Surface JTJL* Drift 



