142 SEC. 4. KINEMATICS, STATICS, AND DYNAMICS. 



260. Double acting ratchet gear. 



261. Ratchet train, with cataract director (Hoffmann). 



262. Double acting ratchet gear. 



(Reuleaux.) Shows that the steam engine is a ratchet train. The 

 model can be worked with various forms of directing gear ; it stands 

 upon a large mahogany frame with columns. 



263. Apparatus for using with Nos. 244 to 254 : Column with 



fly wheel and two connecting rods. 



Escapements. 



264. Graham's anchor escapement. 



265. Escapement of Reuleaux. 



266. Pin escapement of Lepaute. 



267. Escapement of Denison. 



With three-toothed escape wheel. 



268. Gravity escapement of Denison (1860). 



As in the clock at the Houses of Parliament. 



269. Gravity escapement of Denison. 



270. Spindle escapement. 



271. Cylinder escapement. 



272. Anchor escapement. 



273. Chronometer escapement of Jiirgensen. 



564a. XIII. Chamber-crank Gears and Chamber- 

 wheel Trains. 



274. Chamber-crank gear, Simpson and Shipton. 



Steam engine. 



275. Chamber-crank gear, Bahrens, Napier, Bompard. 



Steam engine. 



276. Chamber-crank gear, Wedding, Cochrane. 



Ventilator. 



277. Chamber- crank gear, Ramelli. 



Pump. 



278. Chamber-crank gear, Beale. 



Gas exhauster. 



279. Chamber-crank gear, Cochrane. 



Steam engine. 



280. Chamber-crank gear, Pattinson. 



Pump. 



281. Chamber-crank gear, Minari, Stocker. 



Steam engine and pump. 



282. Chamber-crank gear, Ramey. 



'*' jSteam engine and pump, with elliptic wheels. 



283. Chamber-crank gear, Lemielle. 



Ventilator. 



284. Chamber-crank gear, Cochrane. 



Steam engine. 



