I. SPECIAL COLLECTIONS. 141 



564. XII. Hatchet Trains. 



232. Click train. 



With two external and one internal clicks. 



233. Centrifugal click train. 



If rapid rotation occur, the centrifugal force throws out the click. 



234. Silent click train. 



235. Pinching click train. 



236. Click train of Wilbers. 



237. Ratchet train of Langen. 



Used in gas engines. 



238. Turning ratchet gear (Maltese cross wheel). 



239. Turning ratchet gear (incomplete cross wheel). 



240. Turning ratchet gear (spur wheel). 



241. Ratchet train. 



With automatic disengagement. 



242. Ratchet train, with pin teeth. 



With automatic disengagement. 



243. Ratchet train (Reed). 



With automatic disengagement and fall. 



244. Ratchet train, with fast click. 



245. Single acting ratchet train. 



The direction of motion can he altered. 



246. Double acting ratchet train. 



247. Reversing ratchet train (Francis). 



Used for governors. 



248. Dividing machine (Nasmyth). 



249. Lagarousse ratchet gear. 



With eccentric. 



250. Crown wheel ratchet train. 



251. Tooth ratchet train, with double acting free click. 



Model illustrating action of a force pump. 



252. Escapement train (Mudge). 



Can he held in the stand, No. 32. 



253. Throttle click train. 



Illustrates the action of the throttle valve. 



254. Ratchet train, with pinching clicks. 



255. Ratchet train, with several clicks. 



256. Ratchet train, with free clicks. 



Directing gear can be added so as to illustrate the action of 

 steam engine. 



257. Ratchet train, with fast clicks. 



258. Ratchet train, with Farcy's director. 



259. Ratchet train, with Watt's director. 



Watt's automatic valve gear. 



