Star Globe. A sphere indicating the principal stars, for use in 



star navigation. [13, 15.} 



Star Globe, Paget. An improved star-finding globe. [15.} 

 Star Photograph Micrometer. An instrument originally designed 



to determine the exact co-ordinates of a star or other celestial 



object upon a photographing plate impressed with a standard 



re'seau. \_4.~] 

 Stathmograph. A contrivance for recording the speed of a 



railway train. 

 Station-Pointer. A nautical surveying instrument for locating 



positions on charts. [2, 13, 15, 16, 17, 21, 24, 25, 26, 27, 28.] 

 Station-Staff. A surveying instrument for taking angles. [2, 



13, 15, 17, 27.] 

 Statoscope. An instrument for indicating whether an airship or 



balloon is rising or falling. [13, 17.] 

 Stauroscope. An optical instrument particularly designed for 



investigating the effects of polarised light upon crystals. 



[26.] 

 Stead's Gas Analysis Apparatus. See Gas Analysis Apparatus. 



[17.] 

 Steam Gauge. A gauge (q.v.) for denoting the steam pressure 



and vacuum in steam boilers and engines, etc. [5, 6, 13, 15, 



16, 17, 28] 



Steel Armoured Thermometer. See Thermometer. [4, 5, 6, 15, 



17, 21.] 



Steel Mercury Wells. Steel cups filled with mercury inserted 

 in closed receptacles for obtaining by means of a thermo- 

 meter the temperature of the receptacle. [4, 5, 6, 13, 15, 

 16, 17, 21, 28.] 



Steel Oil-Tape. A graduated steel tape for measuring the contents 

 of an oil tank. [15, 28] 



Stelfox Slide-Rule. See Slide-Rule. 



Stellar Sextant. See Sextant. [10, 13, 15, 16, 17, 25, 26, 28.] 



Stem-divided Thermometer. See Thermometer. [5, 6, 13, 15, 

 16, 17, 21, 28.] 



Stencil Plates. A set of metal plates cut to the shapes of the 

 various letters, figures and designs in common use in archi- 

 tectural and engineering drawings and plans. [2, 10, 13, 

 15, 17, 20, 21, 24, 27.] 



Stereometer. (i) An instrument for measuring the solid or 

 liquid contents of the capacity of a vessel. (2) An instru- 

 ment for determining the specific gravity of porous bodies, 

 powders, etc. 



Stereomonoscope. An instrument with two lenses by which a 

 stereoscopic effect can be obtained from a single picture. 



Stereopticon. An American name for a magic lantern in which 

 photographic slides are employed. [17, 26.] 



Stereoscope. A binocular instrument for giving to pictures the 

 appearance of solid bodies as seen in nature. [13, 17, 20, 

 26.] 



