MISCELLANEOUS. 875 



4307. Bod Windlass. 



4308. Wooden Screws, with threads of different section. 



4309. Wheel on Axle, with stand. 



40 1O. Reel, with stand. 



4311. Six Lever Apparatus, for demonstrating different 

 laws of leverage. 



4312. Apparatus for illustrating the action of pulleys. 



4313. Glass Model of a Suction and Forcing Pump. 



4314. Glass Model of an Hydraulic Press. 



4315. Glass Model of a Fire Engine. 



4316. Segner's Water-wheel. 



4317. Model of a Diving Bell. 



4318. Apparatus for illustrating the Expansion and Com- 

 pression of Air. 



4319. Fly-wheel of glass. 



4320. Fly-wheel. 



4321. Rotating Suction Siphon. 



4322. Apparatus for demonstrating the uniform transmission 

 of pressure in liquids. 



4323. Model of a Suction-pump. 



E. Leybold's Successors, Cologne. 



Molecular Physics. 



4324. Hand Air-pump. 



4325. Fair of Magdeburg Hemispheres. 



4326. Scale Manometer. 



4327. Sound Apparatus, for weighing air. 



4328. Apparatus for illustrating that a vacuum can be 

 filled by a liquid through atmospheric pressure. 



4329. Atwood's Machine. 



4330. Barometer. 



E. Leybold's Successors, Cologne. 



Light. 



4331. Prism. 



4332. Astronomical Models, illustrating course of the rays 



of light. 



E. Leybold's Successors, Cologne. 



