592 



Thermoscopy. 



No. .4965 







54 965. 1 : 12. 



54966. 1:13. 



54 967. 1 : 8. 



54,965. Accessories for Experiments on Change of State (Experiments NOs. 68 ill). Fig. 54.965. 



The following can be demonstrated; different thermal consumptions on melting and dissolving: 

 the action of the August psychrometer; the heat on increasing the disgregation (formation of i<m>): 

 crystallising heat; cooling by evaporation; the degree of evaporation; velocity of evaporation; formation 

 of ice on evaporation; formation of heat on freezing; cooling on evaporation in porous vessels: different 

 heat of evaporation; constancy of the boiling point and melting point; raising and lowering of Mime 

 by salts; the fact that the temperature of the water vapour formed from boiling salt solutions has 

 the temperature of the solution; lowering the boiling point with decreasing pressure and raising it with 

 increasing; the air thrown off from a rotating top. 



f 2 double Capsules (Fig. 28), one with wax, one 



with cetin. 



f 2 large Glass Hemispheres with straight tube. 

 2 spherical Capsules (Fig. 28 a), one covered witli 



muslin. 



1 Device for evaporating ether by means of illu- 

 minating gas (Fig. 29). 



1 Cryophoms. 



1 Porous Pot. 



2 Impulse Hammers (Fig. 30). 

 2 Capsules with shot. 



1 Boiling Flask with capsule, syphon tube and 



closed tube (Fig. 32). 

 1 short and 1 long syphon tube. 



1 Gas Conduit, 1'ipe (Fig. 33). 



1 large Hemisphere with straight tube, with i-ork 



.mil board. 

 1 beaker (Fig. .35). 

 I <.l;i , VCSM-|> fur Milphnrie acid and water 



respectively ( Fi>;. :i<i). 



Pig. 36). 



s. d. 

 1. 4. (I 



5i.'.M;.-,it. Small Collection of Accessories for Experiments on Change of State (Experiments Nos. 68, 69, 70, 7i>a. 

 71, 72, 73, 74, 75, 77), consisting solely of the items marked f under No. 54.1Mi5. for demonstrating 

 the consumption of heat on melting, dissolving and evaporating, and of the heat on increasing the dis- 

 gregation (formation of ions), of the influence of the degree of saturation, and of the formation of ice 

 by evaporation o. Id. n 



Tops for Experiment No. 91, p. 78: see No. 52.O78/83, p. 291. 



5.;iiiii. Accessories for Heat Experiments on Condensation of Gases and Vapours (Experiment N< 92--!i9) n. K; \\ 



For demonstrating the heat during tin- absorptions of gases through solids and liquids, the con- 

 densing of gases and water vapour on wearing apparel. 



1 Boiling Flask with cork and glass tube. 

 1 loin sided Class Plate. 



:! cylindrical Capsules, two covered with wool, 

 one with cotton, with plugs and boanl> 



01 B194, 

 618:!, filSl. 



