No. 



Heat Engines. 



631 



55 253. 1 : 7. 



55 254. 1 : 4. 



55 255. 1 : 6. 



55.246. Apparatus for demonstrating the Geyser, after Tyndall, Figure (Tyndall, Die 

 Warme [Heat], 4 th Edn., 1894, Fig. 54), for gas heating 



The apparatus is heated by placing a Bunsen burner underneath and by the gas ring given 

 with the apparatus, and shows an eruption about every minute. 



55.247. Steam Piston, for showing the action of Water Vapour, of glass, with holder . . . 



55.249. -- idem, Figure, of Metal, with handle 



55.250. - - i d e in, larger, Figure, of glass, with metal mounts and handle, on stand 



55.251. Sectional Model of a Steam Engine Cylinder, Figure, with Slide Valve gearing, 

 large type, of Metal 



55.252. Sectional Model of a Steam Engine Cylinder, Figure, with flywheel, entirely of 

 metal, cylinder bore 36 mm, length 80 mm 



.">"). 253. - - i d e in, Figure, with governor and throttle valve 



#55,254. Sectional Model of a Steam Cylinder, Figure, transparent, for projection . . . 

 The path of the steam can be demonstrated by blowing in some cigar smoke. 



55,255. Sectional Model of an Oscillating Steam Engine Cylinder, Figure, movable, of 

 wood and iron 



s. d. 

 2.16.0 



0. 3.0 



0. 8.0 



1. 4.0 



2. 4.0 



2. 2.0 



4. 4.0 



2. 6.0 



4.16.0 



* Can be used with the projection apparatus. 



Cl. 1890,4200, 

 305, 3957. 



