No. 53821. 



Demonstration Goniometer. Reflecting Goniometers. 



481 



53 819. 1 : 3. 



53 820. 1 : 3. 



pertaining to the apparatus. Hollow brass pillars can be screwed into the alidades, and various acces- 

 sories can be fitted into the pillars, e. g., for optical experiments, two massive brass forks with lateral 

 levelling screws and two brass heads pointed at the top, and these accessories are interchangeable. 



The following are supplied along with the apparatus: 4 small pillars, 4 cylinders, 1 movable table 

 top, 1 key, 2 brass forks, 2 brass pivots, 1 gas burner, 1 glow light and 1 camera obscura. 



53.815. Accessories for Optical Experiments for the Noack Goniometer 



(a) Telescope ( 1.10.0); (b) Slotted Tube ( 1.10.0). 



53.816. Accessories for Magnetic and Electric Experiments with the Noack Goniometer, 

 Nos. 53,813 and 53,814 



(a) Magnetometer with bar magnet ( 2.14.0); (b) Compass with Binnacle ( 1.16.0); (c) Gal- 

 vanometer (without compass, 3.12.0); (d) Tangent Galvanometer ( 1.0.0). 



53.817. Accessories for Demonstrations in Mechanics with Goniometers Nos. 53,813 and 53,814 



(a) 3 Pulleys, Fig. 53,814 B ( 0.15.0); (b) Cubical Tube with Sphere ( 0.5.0); (c) Ring for 

 Tissue Paper ( 6.6.0); (d) Torsion Head ( 0.12.0). 



51,85l'. Set of Weights, comprising 20 weights of 50 g each, with small hooks 



53.818. Goniometer and Spectrum Apparatus for Students' Exercises, after Grimsehl (Ztschr. 

 f. d. phys. u. chem. U. 17, 1904, p. 207) 



53.819. Reflecting Goniometer after Wollaston, Figure, with telescope: the crystals are 

 centered by a centering needle 



The divided circle is graduated in half degrees, of brass, silvered, and provided with vernier for 

 reading to 2 minutes. The telescope aperture is 15 mm, the focal length 104 mm, and the power, 4. 



53.820. --idem, Fig. 53,820, with Fine Motion and Magnifier reading 



The divided circle is 108 mm diameter, the fine motion being secured by worm and rack; with 

 round pattern spirit level. 



53,821. - - idem, simple, for students' use (Wied. u. Ebert, Fig. 135) 



On tripod with levelling screws, graduated in 1 /, Q , vernier read by magnifying glass up to 

 minute. 



-3 s. d. 



3. 0.0 

 9. 2.0 

 1. 18. 



0. 10. 

 2. 8.0 

 9. 0.0 



12.10.0 

 6. 0.0 



Cl. 1243, 1244. 



31 



