34 



Equipment of the Class Rooms. 



No. 50211 



X 







50213. 1:4. 



50 215. 1 : 4. 



CD 



B 



Q 



(D 



>1 



g 

 



50.211. Shutter Heliostat, Figure, movement as in'Nos. 50,205 50,207, simple construc- 

 tion, with a silvered mirror and with an attachment with slit 



50.212. Shutter Heliostat, Figure, endless screw, horizontal motion; arranged to allow 

 of the use of the solar microscope; constructed entirely of brass 



50.213. Clockwork Heliostat (Miiller's), Figure (Zeit. f. d. phys. u. chem. IL, 8, p. 354. - 

 M. T., Fig. 124); easily set up 



50.214. Special Attachment for screwing on the Shutter, Figure, with slit and with 

 Diaphragm Disc, for preceding heliostat 



In addition to containing the diaphragm apertures, the disc has a serpentine slit, for showing 

 that the spectrum is nothing else than a number of slit images in parallel. 



50.215. Clockwork Heliostat, Figure, simple, consisting only of a clockwork movement 

 (the axis of which is mounted on a base at the polar height of the place) and a mirror 

 moving in a hinge 



A special universal motion mirror No. 50,226 is necessary for the heliostat. 



50.216. Shutter Heliostat, Figure, fixed by means of four screws. Size of mirror, 

 270x105 mm; with 2 motions and 2 mirrors, one of the latter being black .... 



50.217. Stand Heliostat, Figure, mirror 180x350 mm, double worm gear movement, on 

 iron base 



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



50.218. Condenser, 90 mm diameter, with metal mount, Figure, for attaching to the 

 wall or window heliostats 



Cl. 40, 48, 



44, 

 43 45. 



8. d. 



3. 0. 

 6. 0. 

 5.15. 

 2. 0. 



4. 5. 



8. 0. 



8.10. 



1. 5. 



