XIII. MODELS, ETC. 555 



_ 2220. Model to show the Conversion of Circular into 

 Reciprocating Motion, in one direction only. 



2221. Model to show the Conversion of Circular into 

 Reciprocating Motion, in two perpendicular directions. 



2222. Model to show Inequality of Motion, when a crank 

 and connecting rod are used ; also that the linear motion may be 

 doubled when the connecting rod is equal in length to the crank. 



2223. Diagram Model, with parts to illustrate the movements 

 when the connecting rod is equal to the crank. Straight line 

 motion. 



2224. Three Models of an Eccentric Circle. 



2225. Model to show Conversion of Circular into Re- 

 ciprocating Motion, with intervals of rest. 



2226. The Swash Plate. 



2227. Crown Wheel Escapement. 



2228. Simple form of Escapement. 



2229. Recoil Escapement for Clocks. 



2230. Dead-beat Escapement. 



2231. Various forms of Escapement. 



2232. Wheel, with one tooth and locking ring. 



2233. Geneva Stop. 



2234. Model of Recoil Escapement, for throwing an image 

 on a screen by the electric lamp. 



2235. Model of Dead-beat Escapement, for throwing an 

 image on a screen by the electric lamp. 



2236. Striking Movement of a Clock (locking plate). 



2237. Striking Movement with Repeater. 



2238. Model to illustrate Compensation Balance Wheel 

 of Chronometer. 



2239. Model of Wheel and Axle. 



2240. Pulley Block. 



