646 



Thermal Conductivity, etc. 



No. 55358 



1 * 



55 364. 1 : 7. 



55 359. 1 : 7. 



55 386. 1 : 6. 



55.358. Cube alter LesLe, 10 cm side, with 4 different surfaces, polished metal, dull white, dull black and 

 shiny black, with Thermometer and Heating Box 0. 



55.359. idem, with 4 thermometers, divided in 1 / 5 , Figure 2. 



55.360. Cube after Leslie, with 4 polished surfaces of different metals: brass, steel, zinc and iron I. 



. ,1. 



18. 



4. 



4. 



16. 



18. 



8. 



4 



8. 



10. (I 



55.361. Double Screen, of sheet zinc, on hinge 0. 



55.362. Screen with rotary disk, with holes of different diameter 0. 



55,348 a. Brass Tube with Rock Salt Slabs, closed, without stand, Pig. 55,350 B, or 1. 



55.364. Glass Tube, with brass mount, Figure, closed by rock salt slabs 3. 



55.365. Holder for carrying Crystal and Gypsum Plates o 



55.366. Rotary Bar with divided circle and adjustable stage 1. 



55,388. Thermopile of 36 elements, arranged square, in mount with polished funnel 2. 14. 



55.367. Stages for setting up Rock Salt Prisms and the like o. 4. 



Galvanometer (Multiplier): see under "Electricity". 



Rock Salt Prisms. List No. 55,368 55,369 55,370 



Side x Height mm 30x40 35x45 40x50 



1.0.0 1.4.0 1.8.0 



Rock Salt Slabs. 



List No. 



Size mm 







55,371 



25x25 

 0.8.0 



55,372 



30x30 

 0. 10. 



55,373 



40x40 

 0. 18. 



55,374 



50x50 

 1.6.0 



55.375. Plates of Alum, Borax, Sugar, Calc-spar, Agate, Crown and Flint Glass, Sal-ammoniac 



Each 



55.376. Plates of Black Glass, Citric Acid and Mica Each 



55.377. Quartz Plates, ground perpendicular or parallel to axis, of Heavy Spar, Fluorspar 



Each 

 Rock Salt Cylindrical Lenses, radius of curvature 300 mm. 



List No. 55,378 55,379 55,380 55,381 

 Diameter mm 30 40 :><> () 



0.18.0 1.4.0 1.12.0 2.0.0 



Rock Salt Lenses, bi-convex, 300 mm radius of curvature. 



List No. 55,382 55,383 55,384 55,385 



Diameter mm 30 40 50 60 



0.14.0 1.0.0 1.8.0 1.18.0 



55,386. Melloni Pile, linear, Figure, on stand with slider and graduation and with thernm- 

 pilr No. .V>,392 



0. 4. 

 0. 3. 



0. 8. 



12. 0. 



Thermopiles, Figure, arranged square, in mount with polished reflector. 



List No. 55,387 55,388 55,389 55,390 



Number of elements '-'"> '>*> I'.i r. | 



2. 2. 2. 14. 3. 6. 4. 8. 



Cl. 3425, 5123, 1939. 



