Latent heat of fusion of ice . Fig. 3.—Section through calorimeter Dickinson, Harper,Osborne Latent Heat of Fusion of Ice 241 Fig. 3 shows the details of construction, representing a sectionthrough the three stirring shafts. The direction of circulation ofthe water is indicated by arrows. The main jacket stirrer drawswater from the bottom of the jacket, sending part of it throughthe cover, which is at a higher level than that of the water inthe jacket, and allowing the remainder to overflow into the upperpart of the jacket. The method of connecting the calorimeter. Fig. 4.—Plan of calorimeter
Latent heat of fusion of ice . Fig. 3.—Section through calorimeter Dickinson, Harper,Osborne Latent Heat of Fusion of Ice 241 Fig. 3 shows the details of construction, representing a sectionthrough the three stirring shafts. The direction of circulation ofthe water is indicated by arrows. The main jacket stirrer drawswater from the bottom of the jacket, sending part of it throughthe cover, which is at a higher level than that of the water inthe jacket, and allowing the remainder to overflow into the upperpart of the jacket. The method of connecting the calorimeter. Fig. 4.—Plan of calorimeter stirrer to its shaft is also shown. The energy supplied by thestirrer is due to fluid friction only, since there is no bearing withinthe calorimeter. Fig. 4 is a plan of the instrument with the cover open. There are thus realized (1) a well-stirred water calorimeter, (2)a very nearly uniform temperature jacket completely surround- 242 Bulletin of the Bureau of Standards [ ing it, and (3) the absence of any material of sensible heat capacityat an intermediate temperature which could affect the rate ofcooling. Constants of the calorimeter are as follows: Water equivalent of metal container and all fixed metal partsas used, nearly all copper, 41 grams. Water equivalent of heating coil, grams. Capacity of calorimeter, 3750 cm3. Cooling constant o?oooo3o per second per degree, or o. 115 calo-ries per second per degree. Variation of cooling constant with temperature, o?000 000 2 perdegree. Power supplied by stirrer at 300 , watts; heats t
Size: 1602px × 1560px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidlat102352661914209209unse
