i6g 



proportional changes in its volume or linear dimensions. 

 The term usually denotes a thermometer of glass, in which 

 the thermometric substance is mercury, but it includes 

 instruments in which other fluids than mercury may be 

 used and other vessels than glass, and also instruments 

 depending upon changes of electrical resistance or other 

 electrical properties with changes of temperature. See also 

 Pyrometer. [2, 4, 5, 13, 15, 16, 17, 20, 21, 24, 25, 26, 27, 28.] 



Thermometer, Alarm. A thermometer used for giving a signal 

 when the temperature rises or falls to a given temperature, 

 at which point an electrical circuit is completed so as to 

 ring a bell or light a lamp. See also Balance Thermometer. 

 [4, 6, 13, 15, 16, 17, 24.] 



Thermometer, Bake-oven. Range, 2oo-75o F. [4, 5, 13, 15, 



16, 17, 21, 26.] 



Thermometer, Baker's Temperating. Range, 3o-i6o F. [4, 5, 

 9, 13, 15, 20, 21.] 



Thermometer, Balance. A thermometer mounted as a balance 

 so that the movement of a mercurial column changes the 

 inclination of the tube. With the aid of electrical or 

 mechanical attachments, it is used for the automatic regu- 

 lation of the temperature of rooms warmed artificially, or 

 as a fire-alarm. See also Alarm Thermometer. [4, 6, 13, 

 15, 16, 17, 20, 21, 24.] 



Thermometer, Banana. A special thermometer for use in the 

 holds of vessels carrying bananas. \4, 5, 6, 13, 15, 17, 20, 

 21.] 



Thermometer, Beckmann. A sensitive mercurial thermometer 

 designed to give within a limited range, which is adjustable, 

 a very considerable expansion of the mercury column. 

 Used for indicating only small differences of temperature. 

 Estimations to one-thousandth of a degree Centigrade can 

 be made with the aid of a lens. 



Thermometer, Blind Scale. A thermometer without any scale, 

 but with a single mark to indicate a particular temperature. 

 [4, 5. 6, 13, 15, 16, 17, 20, 21.] 



Thermometer, Chemical. Any thermometer, usually mercurial 

 for use in chemical operations. The scale is either wholly 

 encased in glass or engraved on the stem itself, so that the 

 instrument may be plunged into caustic or corrosive liquids. 

 [2, 5, 6, 15, 16, 17, 20, 21. 25.] 



Thermometer, Clinical. A form of maximum thermometer for 

 obtaining the temperature of the human body. [2, 5, 6, 9, 

 13, 15, 16, 17, 20, 21, 24, 25, 26, 27, 28.] 



Thermometer, Coal Tar Still. Range, 2oo-75o F. [5, 6, 16, 



17, 21.] 



Thermometer, Condenser. Range, 30-! 60 F. [5, 6, 13, 15, 

 17, 20, 21.] 



