626 



Heat and Work. 



X(,. .-._> (US 



55 218. 1 : 9. 



55 220. 1 : 9. 



55 221. 1 : 3. 



Heat and Work. 



s. d. 



52.048. Apparatus for boiling Water, Alcohol or Ether by Friction; for the whirling table (W. 



D., Fig. 417 [393]; Gan.-Eein., Fig. 451) 0. 5. 



52.049. - - i d e m, with arrangement in order to enable the spirit of wine to be ignited, 



Fig. 52,049, p. 285 0. >. o 



55,185. Apparatus for showing Temperature-change on Expansion and Contraction of Gases, 

 Fig. 55,185, p. 621 (W. D., Fig. 416 [392]), and for determining the specific heat of --uses 

 at constant volume 1. K'.. u 



55,218. Apparatus for showing the Temperature-change on the Compression and Expansion 

 Of Gases, after Tyndall, Figure (Tyndall, Die Warme [Heat], Fig. (i, p. IcS; Gan.- 

 Man., Fig. 546; Gan.-Eein., Fig. 464) 2.10.0 



1 st Experiment. Air at the temperature of the surrounding space compressed in the vessel some 

 hours previous to the experiment shows a cooling effect whan flowing against a thermocouple. 



2nd Experiment. If air which has just been compressed in the flask and thereby become heated 

 is allowed to flow against a thermopile, the latter indicates heat; on repeating this a number of times 

 this heat is exhausted and the galvanometer pointer finally shows cold. 



55.220. Apparatus after Favre and Silbermann, for showing Heating of the Air on Compression 

 and Cooling on Expansion, Figure, with .sensitive spiral thermometer (M. P., Ill, 



Fig. 400 [II, 2, Fig. 248]) (i. Hi. 



A pointer is suspended on a Breguet platinum-silver spiral, above a graduation, in a glass vessel 

 which is in direct communication with the pump cylinder (ef. Pig. 54.SIH1. p. 581). This sensitive 

 thermometer shows the increase of temperature ensuing when the air is compressed by pressing down 

 the piston, and, inversely, the lowering of the temperature on rarifying. 



55.221. Apparatus after Behrendsen for the same purpose, Figure, with stoprock and 



base for setting up on the air pump 1- I. 



A thermocouple is contained in the upper part of the apparatus, its ends leading to two terminals 

 tor the galvanometer lead-. 



55.222. Pneumatic Fire Syringe, of metal, Figure (Gan.-Man., Kig. 5-15; Gan.-Atk.. 



Fig. 452) 0. 7. 



55,22.".. -idem, of glass. Figure , 0.16.0 



The syringe is constmete:! in such mn-incr tli.it the luminous phenomena occurrim; on ignition 

 can plainly be seen through the glass. To make the experiment, the syringe should be pressed firmly 

 against the wall of lecture table with the left hand and the piston pressed in smartly with the light 

 hand, being drawn out immcdiat-ly so that the tinder continues to smoulder. The slow match must 

 be quite dry and hav'e been previously ignited and extinguished once. 



55.22-1. Apparatus for showing the Action of Gunpowder, after Friedr. 0. (i. Miiller (Ztsrhr. 



f. d. ph.ys. 11. di.Mii. U., 2, p. 170; M. T., Fig. 89) 0. 1". 



Cl. 1871, 1873. 1874. 



