874 SEC. 19.' EDUCATIONAL APPLIANCES. 



4285. Model of Morse's Writing Telegraph. 



4286. Induction Apparatus, according to Dubois-Reymond, 

 arranged for medical purposes. 



4287. Pocket Induction Apparatus, according to Werners. 



4288. Spark Inductor, according to Ruhinkorff. 



4289. Spark Inductor, according to Ruhmkorff. 



4290. Induction Apparatus for fundamental experiments. 



4291. Steel Magnet, with five thin plates and keeper. 



4292. Dipping Needle, with stand. 



4293. Magneto-electrical Induction Apparatus. 



4294. Blasting Apparatus for Mining. 



E. Leybold's Successors, Cologne. 



Electricity. 



4295. Electrical Machine, according to Winter, with 

 different connexions for the condensor. 



4296. Holtz's Induction Machine. Diameter of the 

 rotating wheel 520 mm. 



4297. Chime with five bells. 



4298. Fly-wheel on a circular track. 



4299. Lanne's Measure Bottle. 



4300. Discharging Bod. 



4301. Double Fly-wheel. 



4302. Battery of four Leyden Jars. 



4303. Fair of fine Gold-leaf Electrometers. 



4304. Fair of fine Gold-leaf Electrometers, with Zam- 

 boni's Column, improved according to Fechner. 



E. Leybold's Successors, Cologne. 



SECOND SERIES. APPARATUS AND INSTRUMENTS 



FOR ELEMENTARY SCHOOLS. 



Kinematics, Statics, and Dynamics. 



4305. Inclined Flane, simple. 



4306. Windlass (Gopel). 



