No. So 032. 



Heat and Change of State. 



601 



55 015. 1 : 3. 



55 029 A. 1 : 2. 



55 029 B. 1:2. 



55 031. 1 : 9. 



55.023. Ice-breaking Machine, 300 mm high, 165x125 mm upper aperture, width of rolls 

 90 mm 



55.024. - - idem, 340 mm high, 165 X 130 mm opening above, width of rolls 120 mm . 



These machines break up the ice with great ease and rapidity. They are supplied either tin-plated, 

 galvanised or lacquered. 



55,025. Wood's Metal in bars, melting at 65 C. (W. D., p. 512) per 50 g 



55.026. Mousson's Apparatus, Figure (M. P. Ill, Figs. 330/2 [II, 2, Fig. 98100]; Gan.- 

 Eein., Fig. 333), for liquefying ice under high pressure at low temperatures, with stand, 

 key and reversible wood vessel for inserting the apparatus and the cold mixture . . 



55.027. Small Thermocouple of iron and German Silver, for inserting with ice in the hydraulic 

 press in order to shew that melting brought about by pressure increase, and the com- 

 bination of heat taking place, causes a decrease in temperature (W. D., Fig. 414 [390]) 



55,028 Wood Frame, Hook and Wire after Bottomley, for melting an ice block through by 

 means of a heavily loaded wire (W. D., Fig. 415 [391]) 



55.029. 3 Moulds for Ice Regelation, Figs. A and B, of brass (W. D., Figs. 411413 [387389]), 

 for use under the hydraulic press Price, each 0. 6. 



55.030. 2 Iodine Tubes, one filled with Air, the other exhausted (W. D., pp. 535 and 536), 

 for shewing the vapour in the air-filled space and demonstrating critical pressure . . 



55.031. Steam Barometer, Figure, filled, for shewing the tension of water vapour with 

 increasing temperature (W. D., Fig. 353 [333]), with stand, ready for use 



I 



55.032. Detonation Balls (W. D., p. 518 [479]) Per dozen 



Cl. 4044, 1778, 

 6184, 1780, 



s. d. 

 0.16.0 



1. 4.0 



0. 2.0 

 2. 10. 



0. 5.0 

 0. 5.0 

 0.18.0 



0. 7. 



1. 4. 

 0. 0.6 



1781, 1782. 



