No. 55357. 



Radiant Heat. 



645 



55 350 B (55 362, 55 348, 55 365, 55 366), 55 369, 55 388. 1 : 8. 



55,344. Thermometer in vacuo, after Rumford, for showing the rapid propagation of Radiant 

 Heat through a vacuum (Gan.-Man., Fig. 537; Gan.-Rein., Fig. 400) 



* 55,345. Plane Parallel Vessel for alum solution, Figure, collapsible (W. D., Fig. 307 [290]) 

 The vessel consists of two plane parallel glass slabs with a piece of rubber laid between 



# 55,346. - - idem, composed entirely of glass, 100 x 100 x 10 mm 



* 55,347. Device for Absorption of Heat Rays by Coloured Glasses 



The apparatus consists of a radiometer, a flat flask with concentrated alum solution and a 

 number of coloured glasses in wood frames. 



55.348. Apparatus for the Absorption of Heat Rays in Gases and Vapours (W. D., Fig. 372 

 [352]), a brass tube, closed at the ends with rock salt plates, on stand 



55.349. Apparatus for showing that air is not heated by Thermal Rays, Figure (W. D., 

 Fig. 373 [353]) 



A hollow brass cylinder is closed by two rock salt slabs 45 x 45 mm and 6 mm thick. 



55.350. Melloni's Apparatus for Experiments on Radiation, Refraction, Absorption and Re- 

 flection of Heat, Figs. A and B (M. P., 9 th Edn., II, 1, Fig. 523; Gan.-Rein., Fig. 406, 

 411 414, 419), without thermopile or rock salt prism 



The apparatus comprises parts Nos. 55,35155,355, 55,356 a, 55,357, 55,358, 55,348, 55,36155,366 

 and 55,367. For preparations see Nos. 55,368 55,385. 



55.351. The Stand, with a 2 m long rule, divided in cm, of maple and fixed to a baseboard by two pillars 



This stand as well as the following ones can be used simultaneously as an optical bench; also 

 all apparatus fit the stands of optical benches 53,929 53,930, so that one frame only is necessary for 

 the optical bench and Melloni Apparatus. 



55.352. 8 Brass Stands, arranged for clamping to the rule Each 0. 5. 6 



55.353. Locatelli Lamp, with square wick and reflector 



55.354. Weinhold Steam Capsule, polished on one side and blackened on the other, 95 mm diameter . . . 



55.355. Stage with Stand, Platinum Spiral and Spirit Lamp 



55.356. Copper Screen, blackened, for use as constant thermal source 



(a) without stage or spirit lamp 



(b) with stage and spirit lamp 



55,357. Platinum Cap No. 55,341 with Bunsen Burner and with shank for inserting in a 

 stand No. 55,352 



s. d. 

 1. 4.0 



0.12.0 



0. 5.0 

 0.16.0 



1.12.0 

 2. 4.0 



14.4.0 

 2. 0. 



2. 4. 



0. 16. 



0. 10. 



0. 18. 



0. 8. 



0. 18. 



1. 6. 



* Can be used witli the projection apparatus. 



Cl. 1938. 



