METEOROLOGICAL INSTRUMENTS. 



Common Thermometer. (Fig. 586.) 

 The common case for the thermometer 

 is of tin, japanned black, and varying 

 in size from six to fourteen inches in 

 length. 



Price, 6 inch, $0.63. 



7 " $0.75. 



8 ' $0.87. 

 " 10 < $1.00. 

 " 12 < $1.25. 



14 ' $1.50. 



If with Reaumur's or centigrade scale, 

 25 cents in addition. 



Pike's Improved Ther- Fi e- 53G - Fi 

 mometer (Fig. 587) con- 

 sists of a thermometer 

 made as usual, but mount- 

 ed on a mahogany back, 

 with polished edges ; the 

 ball being protected by a 

 brass guard, with holes 

 or slits in it to allow the 

 free circulation of air 

 around the ball. This 

 style of thermometer is 

 much approved of and 

 used by many in keeping 

 meteorological observa- 

 tions. Price, 8 in., $1.00. 

 " 10 " $1.25. 

 " 12 " $1.50. 

 " 14 " $1.75. 



With centigrade scale 

 25 cents in addition. 



If with movable index, 

 and Fahrenheit, and cen- 

 tigrade scale, 14 inches 

 long, $2,50. 



Ill 



190-^ 



J80 = 



170- 



160- = 



HO 



120 



1JO 



100 



70 



50 



CcnteflRpau 



90 



zrSO 



70 



-80- 



70- 



60-- 



50-- 



-50 



-40 



30 



20 



JO 



-JO 



