36 



Equipment of the Class Rooms, 



No. 50225- 



50232. 1:25. 



50 227. 1 : 20. 



50.225. Large Clockwork Heliostat (Foucault's), Figure, with round mirror, 300 mm 

 diameter; substantially constructed, first class clockwork movement, round spirit level 



on base for focussing with adjustable pole height ,45. 0. 



50.226. Universal Motion Mirror, for Heliostats Nos. 50,215, 50,217, 50,21950,225, for 

 transmitting the sun's rays into the room 1. 10. 



50,226 a. Plane Mirror with coarse and fine adjustment, on stand, for transmitting the light 



from the heliostat into the axis of the instrument, Figure 4. 0. 



Hoist for Maps, Drawings, Tables, etc. Figure, for fixing to the blackboard frame or 

 wall; without Spectrum Plate. 



List No. 50,227 50,228 50,229 50,230 50,231 

 Length m 1.5 2345 



Price 0. 18. 1. 0. 1. 5. 1. 12. 2. 0. 



50.232. Map Stand (Jungels's), Figure, with slope adjustment 1. 10. 



The map stand is easily adjusted; by a single handle the two arms can be brought from the 

 vertical to the horizontal position. When not in use, therefore, the apparatus occupies very little 

 space; by turning and lengthening, the oblique adjustment can be used in any position. It is therefore 

 possible to keep the maps stretched taut in any oblique position. 



The apparatus is entirely of iron up to the supporting bar and can be used for all sizes of maps. 



50.233. Portraits of famous Physicists, Chemists and other Philosophers; being photogra- 

 vures in oak frames Price each 0. 8. 



1. Bunsen, R. W. 2. Darwin, Ch. 3. Dvorak, A. 4. Faraday, M. -- 5. Fischer, A. - 

 6. Franklin, B. -- 7. Fresenius, K. 8. Gauss, K. F. 9. Helmholtz, H. v. 10. Hertz, H. - 



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1. 1278. 5159. 

 3901. 31t. 



