The Transactions of the Royal Irish Academy Volume 7 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1800 Excerpt: ...51,78 is 0,6 = / then d, the quantity to be added to the lower sp. grav. is found by, r.j Dd 0,0088 x 0,6 0,0528 the formula a =-T-, -= =-----= 0,00 c 8 D 0,9 0,9 Now + 0,0058 and that found by Hahn is 1,545. = 1,5443 This it is true would be the sp. grav. at 6o, and after 3 days rest (the time I allowed for the penetration of the mixtures mentioned in my tables, ) and it does not appear what the temperature of Hahn's mixture was when he took its sp. grav. is it was 440 (the temperature of his oil of vitriol) it is possible that the cold without exact penetration might produce an effect equivalent to that which time would produce by penetration. 2d Experiment. In this Hahn added 400 grs. of water to the 1200 grs. of the foregoing mixture, and consequently the new mixture weighed 1600 grs. and contained the fame quantity of real acid as the foregoing, that is 628,56 grs. he found its sp. grav. when xold to be '1,38,40. Application. Application. Since 1600 grs. of the mixture contained 628,56 real acid, 100 grs. of it should contain 39,28; now this quantity of real acid is exactly in the table, and corresponds with the sp. grav. 1,3768. Then the difference between Hahn's result and that of my deter72 minations is--. 10000 3/ Experiment. To the 1600 grs. of the last mixture Hahn added 800 of water, and when the whole was cooled down to the temperature of the air he found the sp. grav. of the mixture 1,2439. Ibid. p. 50. Application. This mixture weighed 2400 grs. and contained the fame quantity of real acid as the last, namely, 628,56 grs. consequently 100 grs. of it contained 26,19; this quantity of real acid is extratabular; the nearest tabular quantity of real acid is 25,89, which corresponds with the sp. grav. 1-2415; though this seems sufficiently near to H...