Xn. 53698. 



Optical Benches. 



473 



53 678 a, 53 678 b, 53686. 1: 8. 



53 689, 53 684a (53688). 

 1: 7. 



53 684 b. 1:4. 53690. 1:5. 



53681b, 53686. 1: 7. 



53 681 c, 53686. 1:7. 



53.684. Photometric Accessories with paraffin light for the Weinhold Photometer and Optical Benches, of. s. d. 

 Fig. 53,675, with Topler Photometer Screen, without stands 1. 7. 



(a) Paraffin Lamp, Figure ( 0. 6. 0); (b) Carrier with 4 small Paraffin Lamps and movable 

 diaphragm, Figure ( 0.12.0); (c) Carrier with small Paraffin Comparison Lamp ( 0.3.0); 

 (d) Topler Photometer Screen, see Fig. 53,675 ( 0. 6. 0). 



53.685. idem, with Bunsen Photometer No. 53,683 instead of Topler Photometer Screen 2. 3. 



53.686. Stands for preceding Accessories in order to enable them to be used independently on the lecture table 

 in conjunction with any photometer (see pp. 467, 468) or to enable the accessories to be more conve- 

 niently stored, see Figures Each 0. 5. 



Three or four at least should be ordered. 



53.687. Glow Lamp for 110 volts, with socket and haft, for concave mirror and lens experiments (W. D., 



p. 356 [329]) 0. 5. 



53.688. Perforated Cylinder for concave mirror and lens experiments (W. D., Fig. 272 [258]), fitting Argand 



Gas Burner No. 53,681 a 0. 1. 6 



53.689. idem, for the Paraffin Burner No. 53,684 a, Figure, without burner 0. 1. 6 



53.690. Diaphragmic Cylinder, Figure, with 5 diaphragms of different sizes, for Gas Lamps 0. 12. 



The cylinder is 48 mm diameter. The diaphragm apertures are 0,5, 4, 10, 15 and 30 mm. 



53,<>91. idem, for Paraffin Lamps 0. 12. 



.-,:;. ii<2. 2 Screens for Concave Mirror and Lens Images (W. D., Fig. 273 [259]) 0. 8. 



53.693. 4 Lenses in brass mounts with haft, 3 bi-convex, 1 bi-concave, for demonstrating the terrestrial, 

 astronomical and Galilean Telescope and the Microscope 0. 16. 



53.694. Convex Lens, exact focus 600 mm, 60 mm diameter, in mount with haft 0. 12. 



53.695. Lens Holder with Haft, for inserting one or two lenses for investigating the focal length of a lense 



system, fitting Lenses No. 53,894 (W. D., p. 386 [354]) 0. 5. 



53.696. Optical Bench after Friedr. C. G. Miiller (M. T., Fig. 114 and pp. 166 to 171, 173, 174, 



175), 3 m long, with 4 saddle-stands 1. 10. 



For screen for above, see No. 53,624. 



53.697. Punctiform Limelight after Friedr. C. G. Miiller, for feeding with a gas blast burner 



(M. T., Fig. 115) 0. 6. 



53.698. Arc Light after Friedr. C. G. Miiller (M. T., Fig. 116) 0. 6. 



Cl. 6022, 3674, 



1227, 1224, 1228, 1225. 1226. 



