No. 50224. 



Heliostats. 



35 



50 216. 1 : 6. 



50218. 1:4. 



50217. 1:6. 



50 219. 1 : 4. 



50222. 1:4. 



r>(i. 219. Heliostat (Mey^retem's), Figure, with variable polar height, on metal stand, 

 clockwork in metal case, with protractor and dip circle, with a black and a silvered 



mirror, each 100 mm diameter 



A universal motion mirror No. 50.226 or 50,226 a is necessary for the heliostat. 



50.220. - The preceding, mounted on wood board, clockwork in wood housing, 

 with divided circle and dip circle; with 2 mirrors of 100 mm diameter, board fitted 

 with levelling screws and spirit level 



50.221. --The preceding, without dip circle 



50.222. Clockwork Heliostat (Fuess's), Figure; mirror quite plane, 85x190 mm, with 

 large clockwork motion 



50,222 a. The preceding, simpler, and slightly smaller (Zeit. f. d. phys. u. chem. 

 TL, 9, 1896, p. 157) . . . * \ 



50.223. The preceding, heavily constructed, with JlOOx 225 mm mirror 



50.224. The preceding, with 300 x 150 mm mirror, for vegetable physiology pur- 

 poses, etc 



For Universal Motion Mirrors for above Heliostats, 

 see Nos. 50,226 and 50,226 a. 



Cl. 1281. 1280. 1283, 

 1277, 1278. 



s. d. 

 8. 0.0 



7. 0.0 

 6. 0.0 



20. 0.0 



|l2. 10. 

 26. 10. 



30. 0.0 



3* 



