600 



Thermoscopy. Heat and Change of State. 



No. 55010 



55 013. 1 : 4. 



55016. 1:3. 



55019. 1:12, 





55.010. Colour Thermoscope after H. Eebenstorff, Figs. A D (Ztschr. f. d. phys. u. chem. i s. d. 

 U. 9, 1896, p. 227; and 15, 1902, p. 145; W. D., 4 th Edn., pp. 568 et seq.) .... 1. 2. 



The mode of action is based on the fact that mercuric iodide with which the apparatus in 

 question is coated changes its colour when submitted to temperature variations. While it is quite 

 yellow at ordinary temperature, it becomes red when heated to from 45 to 50 C., assuming the yellow 

 colour when cooled below 35 C. 



The complete set of apparatus comprises: 1 Card with 5 thermopaints, 80 x 160 mm; Glass 

 Tubes filled with hydrogen and air, Pig. C; 1 Tinfoil Screen, Fig. A; 1 Screen with rock salt and glass 

 slab, Fig. D; 1 Sheet Iron Screen with two wood wedges, Fig. B; and 1 Brass Stand with polished 

 wood base. 



55.011. 10 thermoscopic coloured Sheets after Eebenstorff (Ztschr. f. d. phys. u. chem. U. 21, 



1908, pp. 291 and 304) 0. 4. 



55.012. Autogram Discs for colour thermoscopes, Figure 0. 3. 



The disc is coated half yellow and half red (with silver mercury iodide and copper mercury iodide , 

 respectively) and transparent sections cut away. When held high above a flame the temperatures of 

 the enantiomorphic molecular changes (45 and 70 C.) are shewn. 



55.013. Sensitive thermoscopic Sound, Figure 0. 10. 



The Sound, coated with thermoscopic paint, consists of a sheet iron capsule for lukewarm water 

 or thermophoric substance. 



Change of State. 



55.014. Freezing Thermometer, for shewing the over-cooling of water and the generation of 



heat on freezing, with stand (M. P. Ill, Fig. 320 [II, 2, Fig. 88]; Gan.-Eein., Fig. 336) 0. H). u 



55.015. idem, Figure, with transparent scale for objective demonstration, small 



pattern, with stand 



0. 7. 



55,016. Hollow Iron Sphere with closing screw (Explosion Ball), Figure, for shewing the 

 increase of volume when water freezes (W. D., Fig. 351 [331]; Gan.-Eein., Fig. 33H; 

 M. T., p. 153) 0. 1. 8 



The closing screw need only be provided once and can be used for a number of experiments. ! 



'<>. ol 7. Iron Sphere alone, as spare 0. o. 10 



55,018. Cooling Vessel of stout wood, for above, with lid, for holding the fractured pieces 



of the bursting sphere 0. 5. 



Ice Machines for generating Ice by a freezing Mixture or by the combinal ion of Heat on dissolving 

 Ammonium Nitrate: see p. 214. 



Ice Machines after Carre", Figure, with air pump (M. P. Ill, Fig. 360 [II, 2, Fig 217]; 

 Gan.-Man., Fig. 172, I, II; Gan.-Eein., Fi<r. 363). 



List No. 55,019 55,020 55,021 55,022 



Generates Ice, kg 2 34 46 1012 



11.0.0 13.10.0 15.0.0 30.0.0 



* Can lit- used with tlir lYoji'ction App;r;i' u- 



Cl. 1705, 1766, 1767. 170S, 

 4504, 6207, 1777. 



