MISCELLANEOUS. 871 



22. BecquerePs phosphoroscope. 



23. Three rotatory tubes by Geissler. 



24. Apparatus for Arago's rotation magnetism. 



25. Apparatus for producing inducted currents in a rotating 

 copper disc, with electro-magnet. 



26. Large wire-spirals for the phenomenon of the earth's in- 

 duction. Emil Stohrer, Leipsic. 



FIRST SERIES. APPARATUS FOR SUPERIOR 

 EDUCATIONAL INSTITUTES. 

 Kinematics, Statics, and Dynamics. 



4221. Model of a Bramah's Hydraulic Press. 



4222. Model of a Turbine. 



4223. Model of a Centrifugal Pump. 



4224. Apparatus for demonstrating the Archimedean 

 Principle, consisting of hollow brass floater, glass cylinder with 

 discharge tube, and graduated glass cylinder. 



4225. Five different Models of Valves. 



4226. Inclined Plane. 



4227. Gyroscope, according to Fessel. 



4228. Gridiron Pendulum. 



4229. Bevelled Gearing. 



4230. Windlass, with tooth and movement. 



4231. Endless Screw. 



4232. Centrifugal Machine. 



4233. Apparatus for demonstrating Foucault's Pendulum 

 Experiments. 



4234. Ball-Regulator. 



4235. Apparatus for Oblique Tubes. 



4236. Glass Vessel for Liquids of different specific weights. 



4237. Syren Disc of brass, sounding major and minor chords. 



4238. Apparatus for demonstrating the oblate form of the 

 Earth. 



4239. Colour Disc. 



4240. Apparatus, consisting of two balls of unequal weight 

 moving along a wire. 



