472 



Propagation and Intensity of Light. 



No. 5369 - 



53 676 A, 53 678 (53 683). 1 : 20. 



L 



L 



53 676 B. 1 : 20. 

 53,669. Spare Wick Tube for the Hefner Lamp, verified 



* 



53.671. 6 Standard Candles 



53.672. Optical Bench after Weinhold, cf. Figure 53,675 (W. D., 2 nd Edn., Fig. 237), 

 constructed in one part of wood, 4 m long, with scale on both sides and with 3 saddle- 

 stands; in addition to being used as a photometer bench it can be employed for a large 

 number of optical experiments. Price, without photometer screen, paraffin burner or 

 comparison lamp 



For accessories: see Nos. 53,678 53,695. 



53.673. --idem, of wood and constructed in two parts 



53.674. - - i d e m, 3 m long, of wood and in one part, cf. Figure 53,675, without acces- 

 sories . 



8. <1. 



0. 4.0 

 0. 3.0 



53,675. - - idem, constructed in two parts, 3 m long, 

 No. 53,684 illustrated 



Figure, without accessories 



53.676. Optical Bench after Weinhold, entirely of metal, graduation 4 m long, and constructed 

 in two parts, Figures A and B (W. D., Fig. 262 [248]), without the comparison 

 lamps set up on the saddle-stands and without photometer 



Fig. A shows only one-half of the bench. 



53.677. - - idem, graduation 3 m long, entirely of metal and constructed in two parts, 

 cf. Figure 53,676 B 



53.678. Photometrical Accessories with electric light, for the Weinhold Optical Benches, with Bunson Photo- 

 meter, see Fig. 53,076 A and 53,678 a and b ; 



(a) Carrier with 4 tubular glow lamps and movable diaphragmic screen ( 1.4.0); (b) 1 Com- 

 parison Glow Lamp together with connecting leads and double plug-contact, arranged for inserting 

 in the saddle-stands of the optical bench ( 0.10.0); (c) 1 Bunsen Photometi-i . No. 53,683 ( 1.2.0). 



53.679. idem, with Topler Photometer Screen No. 53,680 instead of the Bunsen Photometer. SIT 

 Fig. 53,675 



53.680. Photometer Screen (after Topler) alone, for inserting in the saddle-stands of ihr ITIU-II. MT l-'ig. 53,675 



53.681. Photometrical Accessories for Gas Light, for Weinhold Photometer and Optical Hem-hes, see Fig. 53,681b 

 and c, with Topler Photometer Screen (see Fig. 53,675), without stands 



(a) Incandescent Gas Burner ( 0. 5. 0); (b) Carrier with 4 small gas jets and movable Diapin aizm 

 (Fig. 53,681 b) ( 0.12.0); (C) Small Comparison Lamp for gas (Fig. 53,681 c) ( 0.3.0); (d) Topler 

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



53.682. idem, with Bunsen Photometer (see Fig. 53,676 A) instead of the Topler Photometer Screen . 



53.683. Bunsen Photometer Head, alone, for inserting in the saddle-stands, of the brnrh (see Fig. 53.67UA) 



3. 0. 

 3.12. 



2. 10. 



3. 2.0 



4. 16.0 

 4. 10. 



2. 16. i> 



_>. II. O 

 (I. 6. 



1. 6. 



-'. L'. II 



1. 2. 



Cl. 3674, 1223. 



