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Transcript
Reverse of page 44 of James Watt’s Laboratory Notebook Distillation in vacuo I suppose to be = to 2 ounces of (that is to 2/3) of its bulk of water) An error was committed on the other page in computing the quantity of heat given by the tin cone by its weight instead of it Bulk The calculations should stand as follows: 130oz 6dr of water = 28oz tinned Iron = to [-] ------the 2 oz water 132.6 which is = to grains 63620 x by degrees gained 9o 572580 subtract heat given by cone 143 x 72 = 10296 ÷ by 2/3 = 7000 ÷ by the weight of 565580 condensed in cone -----534 gives 1059 Latent heat + 62 heat retained = 1121 sum of sensible and latent heat NB no allowance is made for water adhering to Cone because it was equally wet at the beginning of experiment and I even suspect that there was some water condensed in it before put into refrigeratory. Page 45a of James Watt’s Laboratory Notebook April 1814 Observations on the experiments on Latent heat p.38 to 42. These experiments were made with great care, but two material errors were committed in the mode of calculating them. The first was the assuming the avoir dupois ounce at 432 grains; whereas it contains 437½ This was perceived in the course of the experiments & the 9th 10th & 11th were calculated properly in that respect, but the others remained uncorrected, till this time The second error consisted in adding the condensed Steam to the weight of the cold water and after multiplying that sum by the heat gained, adding & dividing by the weight of the condensed Steam, adding the degrees of heat of the cold water, in order to find the total sensible and Latent heats. Whereas the weight of the cold water alone should be x by the heat gained and divided by the weight of the condensed steam, to which should be added the heat of the hot water, to give the total Sensible and Latent heat, from which if the sensible heat of boiling water = 212 be deducted the remainder is the latent heat, as is directed in p.38. As it happened however these errors nearly balanced one another so that the results did not differ materially. On looking over these experiments this year on the occasion of correcting Dr Robison’s article on Steam & Steam Engines [continued on reverse of page 45a]