171 



column of the thermometer, or may consist of a small index 

 of iron which is pushed by the mercury column. [2, 5, 6, 

 13, 15, 16. 17. 20, 21, 24, 25, 26, 27.] 



Thermometer, Maximum and Minimum, Six's. A combined 

 maximum and minimum thermometer, employing alcohol 

 and mercury as the thermometric liquids. 



Thermometer, Minimum. A thermometer, usually with alcohol 

 as the liquid, for registering the minimum temperature 

 reached during a given period. The index is of glass or 

 enamel. [2, 5, 6, 13, 15, 17, 21, 24, 25, 26, 28.] 



Thermometer, Molten Metal. A glass thermometer encased in 

 a metal frame for dipping into metals, such as type metal, 

 with comparatively low melting points. Ranges, 200- 

 750 F., and 2OO-i,ooo F. [5, 6, 15, 16, 17.] 



Thermometer, Obtuse Angle. A steam thermometer with the 

 lower or bulb end set at an obtuse angle to the stem. [5, 13, 

 15.] 



Thermometer, Oil-Boiling. Range, 2oo-65o F. [5, 13, 15, 16, 

 17, 21.] 



Thermometer, Oil Fuel. Range up to 100 F. [13, 15, 16, 17, 

 21, 28.] 



Thermometer, Oil-Tempering Bath. Range, 2oo-65o F. [5, 

 6, 13, 15, 16, 17.] 



Thermometer, Oxide-Testing. Range, 6o-2oo F. [13, 15, 21.] 



Thermometer, Photometer. [13.] 



Thermometer, Pit. A portable form of thermometer for use 

 underground. [5, 6, 13, 15, 16, 17, 21, 24] 



Thermometer, Platinum Resistance. See Resistance Thermo- 

 meter. [4] 



Thermometer, Pot Leather. Range, ioo-3oo F. [6, 13, 15.] 



Thermometer, Pressure. A thermometer for the measurement 

 of temperature under pressure. Range, 2oo-35o F. and 

 i-ioo Ibs. per square inch pressure. [4, 6, 15, 17] 



Thermometer, Quenching Bath. Ranges, 3o-22o F. and ioo- 

 250 F. [6, 13, 21.] 



Thermometer, Radiation. A thermometer specially adapted for 

 indicating the radiation of heat from grass or from the sun. 

 See Solar Radiation Thermometer. [5, 13, 15, 17, 20, 21, 26.] 



Thermometer, Refrigerator. Range, o-go below zero F. [5, 

 6, 9, 13, 15, 17, 21, 26, 28] 



Thermometer, Resistance. A temperature-measuring instrument 

 depending on the principle that the electrical reistance of a 

 wire increases with the rise of temperature. The wire 

 usually emplbyed is of platinum. See also Distance Thermo- 

 meter and Pyrometer. [4, 13, 16.] 



Thermometer, Right Angle. A steam or vat thermometer with 

 the lower or bulb end at right angles to the tube scale. [5, 

 13, 15, 17, 21] 



Thermometer, Sea Surface. Range, 26-95 F. [6, 13, 15, 17, 

 21, 28.] 



