Fig. 3-This diagram represents the relative ^^^m^cy of the th ee 

 principal types of thermometers in general use^ Two hundied ap^^^^ 

 thermometers were tested; 124 of the U -tube pattern 55 of ^h^ °rmnaiy 

 stem variety, and 31 of the horizontal self-recordmg stj le^ Onl> i /^ o 

 the U-tube pattern, 2% of the ordmary straight stem, and o. /^ 

 horizontal model were found to be accurate. 



