596 



Thermoscopy. 



No. 54 976 



54976,54977. 1:10. 



54983. 1:16. 



54 984. 1 : 10. 



54 985. 1 : 7. 



54.976. Accessories for Experiments on Absorption, Emission and Permeability of Heat Rays, 

 Figure (Experiments Nos. 1 4) 



(a) Thermal Sources: 4 Metal Boxes for steam heating, black-black, black-white, black-polished, 

 polished-dull (Figs. 3 and 4, 1.2.0); (b) Receivers: 5 Metal Receivers, round pattern, 2 black-white, 

 1 each black-polished, white-dull, polished-dull (Figs. 3 and 4, 1. 7. 0); (c) 2 double Screens with rect- 

 angular piece cut away for taking rock salt, plate glass, etc. slabs (Fig. 4, 0. 6. 0); (d) 2 U-shaped Alu- 

 minium Sheets for closing the apertures ( 0. 2. 0); (e) 2 Slabs mounted in cork, 40 x30 mm. of rock salt 

 and plate glass (Fig. 4, 0. 13. 0); (f) 2 double Screens with round opening 75 mm diameter for taking 

 the flat glass vassels (Fig. 5a, 0.7. 0); (g) 4 flat thin-walled Glass Vessels for distilled water, alcohol, 

 iodine solution and concentrated ferrous sulphate solution (Fig. 5b, 0. 13. 0). The accessories No. 54,975 

 should also be ordered and possibly also Nos. 54,978 54,982. 



54.977. Board with 15 Brass Sockets for containing the Metal Eeceivers, with pasteboard cover, 

 see Fig. 54,976 '. 



54.978. Alum Slab, mounted in cork, (addition to Expt. No. 3) ,. 



54.979. Gypsum Slab ditto ( ditto 3) 



54,980. Mica Slab 



ditto 



ditto 



3) 



s. d. 

 4.10.0 



54.981. Rock Crystal Slab, cut perpendicular to axis, mounted in cork (addition to Expt. No. 3) 



54.982. Rock Crystal Slab, cut parallel to axis, mounted in cork (addition to Expt. No. 3) 



54.983. Accessories for Experiments on Reflection of Thermal Rays on concave Mirrors, double and triple 

 reflection, cold rays (Experiment No. 5, I III), Figure 



(a) 2 spherical concave Mirrors, 400 mm diameter and 175 mm focal distance, of German Silver. 

 on adjustable stands (Figs. 6 and 31, 6. 0. 0); (b) 1 small Metal Receiver 65 mm diameter on adjustable 

 stand, and 1 rubber tube 55 cm long, and 1 small Glass Tube (Figs. 6 and 31, 0. 13. 0): (c) 1 adjustable 

 Stand for the spirit lamp stage, with wire gauze globe (Figs. 6 and 31, 0.6. 0); (d) 1 White-metal Slab, 

 600 and 400 mm (Fig. 7, 0.1.0); Accessories No. 54,975 should also be ordered. 



54.984. Accessories for Experiments on Refraction of Thermal Rays (Experiment No. 6, Fig. 8), Figure . . 



(a) 1 semi-cylindrical Double Screen with adjustable gap ( 1.0.0); (b) 1 equilateral Rock Salt 

 Prism, 35 mm side and 70 mm height, with stage ( 3.17.0); (C) 1 rotary Bar with divided circle 

 ( 1.8.0); (d) 1 simple plane Gap ( 0.12.0); (e) 1 semi-cylindrical Receiver, the plane side black 

 ( 0. 9. 0); (f) 1 Wire Gauze Globe 70 mm high, on thick wire stirrup ( 0. 2. 0). Accessories No. 54,975 

 should also be ordered. 



54.985. Accessories for Experiments on Total Reflection and Reflection on plane Metal Mirrors (Experiments 

 Nos. 7 and 8, Fig. 8), Figure 



(a) 1 rectangular Rock Salt Prism, 35 mm side and 70 mm height, with stage ( 3. 17. 0); 

 (b) 1 nickelled plane Mirror, o. metal, 100 x 100 mm ( 0.4.0). Accessories Nos. 54,975 and 54,984 

 should also lie ordered. 



54.986. Accessories for Experiments on Thermal Conduction of Solids (Experiments No. 9, Fig. 9), Figure 



(a) 2 Metal Receivers in the form of truncated cones ( 0. 11. 0): (b) 2 Sheet Iron Flasks for hot 

 water or steam heating ( 0. 9. 0); (C) 2 each round Wood Slabs cut with and across the Limin. ><( pine, 

 poplar and oak, 50 mm diameter, 10 nun thick ( 0. 2. 0). Accessories No. 54,1)75 should also be ordered 

 and perhaps also Nos. 54,987/90. | 



fl.6166, 6164, 

 0188, 617.'.. 



1.12.0 



0. 11. 



I). 11. II 



0. 11. 



0. 14. o 



0. 14. It 



7. 0. 



7. 8. 



4. 1. 



1. -2. u 



