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CHAS. LENTZ & SONS 
Incubator ana Cbemical CDermomeUrs 
2268. Incubator Thermometers, special, extra quality and very accurate, 
wide porcelain scale, with very distinct index to facilitate reading at a distance. 
The degrees on scale are well separated ; 25° to 50° C. ; red line at 37^^°. The 
stem is contracted below scale so that it can be inserted deeply through a cork in 
tubulature of incubator with all graduations visible— used in all Philadelphia 
laboratories and numbers of laboratories throughout the United States. 
Short stem, extreme length, i i-inch, each $2 
T (Id u « " 2 2o 
Long 17- ^ 
Special sizes made to order, each 
2270. Chemical Thermometers, scale etched on stem, extra grade. These 
thermometers are carefully and accurately graduated and tested at extreme and 
intermediate temperatures. They are made from well seasoned tubes and have 
lens front; magnifying the column of mercury, to facilitate accurate reading at some 
distance. They are furnished in stiff pasteboard case. 
12-inch thermometer, 220° F. or 100° C, each $1 00 
12- " " 300° F. or 150° C, " 1 25 
14- " " 400° F. or 200° C, " 1 SO 
2272. Chemical Thermometers, porcelain scale, same quality as above, 
but not lens front. 
8-inch thermometer, 50° C, each $1 
12- " " 212° F. or 100° C, each 1 OO 
14. " " 400° F. or 200° C, " 1 50 
2274. Chemical Thermometers, hand-written, paper scale, small diam- 
eter, extra quality, but not lens front. 
8-inch thermometer, 32° F. to 212° F. or 0° to 100° C, each $0 60 
14. » « 32° F. to 400° F. or 0° to 200° C, " 75 
Note.— Chemical thermometers for students' use can be supplied, with special 
metal sheaths with bulb and graduations visible, at extra cost. 
2276. Veterinary Thermometer, encased in a strong, nickel-plated sheath, 
with bulb and scale exposed and may be used without being removed, useful in anti- 
toxin and tuberculin work. 
Each ' $2 00 
Clinical Thermometers (see surgical instrument catalogue). 
No. 2270 To convert Fahrenheit degrees into those of Centigrade— subtract 32, divide 
by 9 and multiply by 5. 
To convert Centigrade degrees into those of Fahrenheit — divide by 5, multiply 
by 9 and add 32. 
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