156 



Slide-Rule, Boucher's Calculating Circle. A small pocket circular 



slide-rule. [5, 13, 15, 17,21, 24, 27.] 

 Slide-Rule, Chemist's. A slide-rule specially adapted for chemical 



calculations. [13, 24.] 

 Slide-Rule, Davis Lee Bottomley. A slide-rule having special 



scales for circle spacing. 



Slide-Rule, Davis Martin Wireless. A slide-rule for use in deter- 

 minations of wave-length, capacity and self-induction. [21.] 

 Slide-Rule, Davis Stokes Field Gunnery. A slide-rule for field 



gunnery calculations. [21.] 



Slide-Rule, Electro. A slide-rule for electrical calculations. [15.] 

 Slide-Rule, Farmer's Profit-Calculating. [15.] 

 Slide-Rule, Fuller's Calculating Slide Scale. A logarithmic slide- 

 rule in the form of a cylinder with a special scale on the 



surface. [2, 13, 15, 20, 21, 24, 25, 26, 27.] 

 Slide-Rule, Gravette. An early form of slide-rule, invented by 



M. Gravette. [21, 24.] 

 Slide-Rule, Hall's Nautical. A special form of slide-rule for 



calculations in navigation. [15.] 

 Slide-Rule, Jakin. [13, 15.] 



Slide-Rule, Log Duplex. A slide -rule for trigonometrical cal- 

 culations. [15.] 

 Slide-Rule, Multiplex. A slide-rule for the direct reading of 



cubes, cube roots, etc. [13, 21, 26.] 

 Slide-Rule, Polyphase. A slide-rule for electrical and hydraulic 



calculations. 

 Slide-Rule, Sheppard's Cubing. A slide-rule specially designed 



for the use of quantity surveyors, timber nerchants, etc. 



[IS, 21.] 

 Slide-Rule, Stelfox. A slide-rule with a 5-in. stock and a lo-in. 



jointed slide. 

 Slide-Rule, Whitley. A slide-rule for calculating altitudes. [13, 



15] 

 Slide-Rule, Wilson's Double. A slide-rule for calculating the 



displacement, registered tonnage, I.H.P., and speed of 



vessels from the dimensions and coefficients. [8, 13, 15.] 

 Sliding Gauge. An instrument used by mathematical instrument 



makers for measuring and setting off distances. [2, 13, 17, 



27.] 

 Slidometer. An instrument for indicating and recording shocks 



to railway cars occasioned by sudden stopping. 

 Smith-Davis Piecework Balance Calculator. See Piecework 



Balance Calculator. [15.] 

 Smith Revolution-Indicator. See Revolution-Indicator, Aviation. 



[13.] 



Sodeau's Gas Analysis Apparatus. See Gas Analysis Apparatus. 

 Solar Attachment. An attachment to the transit theodolite 

 for the accurate determination of the true or astronomical 

 meridian. [13, 15, 17, 18, 21, 24, 25, 26, 27.] 



