LABORATORY SUPPLIES AND CHEMICALS 



249 



Fig. 84 



3709(b) EXPANSION PYROMETERS, Brown. These instruments are not as ac- 

 curate as the electric pyrometer, but for many uses where the tempera- 

 ture is moderate and the highest accuracy is not required, they give very 

 satisfactory results. They are extensively used in core ovens, enameling 

 ovens, tinning pots, and for similar uses. The instrument is furnished for 

 use either vertically or horizontally, as desired. Unless otherwise speci- 

 fied, the horizontal instrument is furnished with stem 36 inches long. 



Graduated to 800 C 

 Graduated to 1200 C 

 Graduated to 1500' 



Fahrenheit $12.00 



Fahrenheit 15.00 



Fahrenheit . 20.00 



SEGER PYROMETER CONES 



3711 



3711 PYROMETER CONES, Seger, for use in ceramic industry ranging from 590' 

 to 1910 Centigrade. In the following table are shown temperatures at 

 which cones begin to melt. 



TABLE OF OFFICIAL MELTING POINTS OF CONES 



These .cones are sold in single numbers packed in boxes of 100 cones each, and also 

 in assorted numbers, any quantity as desired. 

 Price, per 100 ; , , $3.00 



