556 SEC. 12. APPLIED MECHANICS. 



2241. Disc and Boiler Motion. 



2242. Two forms of Screw Thread. 



2243. Two Models to show the principle of Counting 

 Machines. 



2244. Counting Machine. 



2245. Model to show Reversing Motion of the Table in 

 Whitworth's Planing Machine. 



2246. Model of Double Back and Fin Wheel. 



2247. Model of Cams in combination, taken from a 

 machine for shaping plugs for bullets. 



2248. Cam to Write the letters B.I. (Cowper's Model). 



2249. Worm Barrel. 



2250. Beversing Motion, with two and three spur wheels 

 (quick return). 



2251. Beversing Motion with Clutch. 



2252. Model of Train of Wheels. 



2253. Specimen of Spur Wheel. 



2254. Two Models of Slit-bar Motion. 



2255. Application of Slit Bar Motion in Whitworth's 

 shaping machine. 



2256. Two Models of Batchet Wheels. 



2257. Masked Batchet Wheel. 



2258. Silent Batchet Wheel. 



2259. Model to show Advance of a Batchet Wheel 

 through part of the Space of a Tooth. 



2260. Batchet Wheel, for traversing the cutter in a planing 

 machine. Clement's Click. 



2261. Machine for Printing Numbers. 



2262. Drawing of a Lathe. (Whitworth.) 



2263. Drawing of a Planing Machine. (Whitworth.) 



