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. 1841 edition. Excerpt: ...places were correctly ascertained, the former by the mean height of the mercury for four years. As every thing depends upon the accuracy of the instruments employed, I shall observe, that the barometers used by my brother and myself in 1818, which were the first successfully carried through this quarter of the ...
Read More
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. 1841 edition. Excerpt: ...places were correctly ascertained, the former by the mean height of the mercury for four years. As every thing depends upon the accuracy of the instruments employed, I shall observe, that the barometers used by my brother and myself in 1818, which were the first successfully carried through this quarter of the hills, were manufactured by a native of India, and every precaution was taken to ensure precision. The mercury was revived from Cinnabar with iron filings, in an iron retort, and boiled in the tube, which from the thinness of the glass, we found a most tedious and laborious, operation, occupying from ten to twelve hours each tube, and although we succeeded in boiling fourteen, yet we broke nearly as many; these tubes were of various lengths, from twenty-three to thirty-one inches: they were compared together, and found to agree as nearly as can be expected, there not being a difference of more than T-5-of an inch, which is what the scale read off to; they were immersed in a basin of mercury, and placed perpendicular by a plummet; and the best proof of the air being completely expelled, is that tubes of half an inch and eight inches vacuum, shewed exactly the same height, and on applying a lighted candle to the top of the shortest, the mercury seemed to rise: whereas had there been the least air, it must have sunk by the expansion, which would have been clearly perceptible in so small a space.. The scales were fir rods graduated by myself to rfa of an inch from a Troughton's standard brass scale, and they were fitted exactly to the surface of the mercury. Two barometers were left at Soobathoo, and out of the fourteen which we took with us, only two returned in safety, and these agreed exactly with the others. The barometer which I used in...
Read Less
Add this copy of Account of Koonawur, in the Himalaya Etc Etc Etc 1 to cart. $24.14, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2019 by HardPress Publishing.
Add this copy of Account of Koonawur, in the Himalaya: Etc. Etc. Etc to cart. $36.21, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2019 by Hardpress Publishing.
Add this copy of Account of Koonawur, in the Himalaya: Etc. Etc. Etc to cart. $51.11, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Palala Press.
Add this copy of Account of Koonawur, in the Himalaya: Etc. Etc. Etc to cart. $67.41, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Palala Press.
