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Books Books 1 - 10 of 10 on The concave face of the great? mirror is forty-eight inches of polished surface in....
" The concave face of the great? mirror is forty-eight inches of polished surface in diameter! The thickness, which is equal in every part of it, is about three inches and a half; and its weight, when it came from the cast, was two thousand one hundred... "
The book of English trades, and library of the useful arts - Page 280
by Book - 1818 - 444 pages
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The ambulator; or, The stranger's companion in a tour round London ...

John Bew - 1807
...seaming, well known to those who make iron funnels for stoves. The concave face of the great mirror is 48 inches of polished surface in diameter! The thickness,...half; and its weight, when it came from the cast, was 2,1 18 pounds, of which it must have lost a small part in polishing. The method of observing by this...
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London, by David Hughson

Edward Pugh - 1808
...seaming, well known to those who make iron funnels for stoves. The concave face of the grea* mirror is forty-eight inches of polished surface in diameter!...half; and its weight, when it came from the cast, was two thousand one hundred and eighteen pounds, of which it must have lost a small part in polishing....
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London: Being an Accurate History and Description of the British ..., Volume 5

David Hughson - London (England) - 1808
...seaming, well known to those who make iron funnels for stoves. The concave face of the greats mirror is forty-eight inches of polished surface in diameter!...; and its weight, when it came from the cast, was two thousand one hundred and eighteen pounds, of which it must have lost a snwll part in polishing....
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London; being an accurate history and description of the British ..., Volume 5

David Hughson - London (England) - 1808
...seaming, well known to those who make iron funnels for stoves. The concave face of the great? mirror is forty-eight inches of polished surface in diameter!...half; and its weight, when it came from the cast, was two thousand one hundred and eighteen pounds, of which it must have lost a small part in polishing....
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The Book of English Trades, and Library of the Useful Arts ...

Industrial arts - 1818 - 442 pages
...predecessors in this department of mechanics. He has made them from 7, 10, 20, to even 40 feet in length, and with instruments of these dimensions he is now employed...Herschel has not made the composition public ; but Mr. Edwaras, an intimate friend of his, after repeated trials, found this proportion the best for receiving...
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The Book of English Trades, and Library of the Useful Arts ...

Industrial arts - 1818 - 442 pages
...now employed in makin'g discoveries in astronomy. To describe these instruments wouldfar exceed 2B the limits to which we are confined ; but we may mention...quantity in the polishing. The metal is an amalgam sup?osed to be composed of 32 parts of copper, 5 of tin. 1 of brass, 1 of silver, and 1 of arsenic...
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Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory, and N ...

John Mason Good, Olinthus Gilbert Gregory - 1819
...inches of polished surface in diameter. The thickness, which is equal in every part of it, remains now about three inches and a half; and its weight, when it came from the cast, was 1118 pounds, of which it must have lost a small quantity in polishing. To put this speculum into the...
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Dictionary of the Mathematical and Physical Sciences, According to the ...

James Mitchell - Mathematics - 1823 - 576 pages
...inches in diameter, or polished surface. The thickness, which is equal in every part of it, remains now about three inches and a half; and its weight, when it came from the cast, was 2118 pounds, of which it must have lost a small quantity in polishing, and it magnifies with proper...
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Family Magazine: Or Monthly Abstract of General Knowledge, Volume 1

1834
...seaming well known to those who make iron funnels for stoves. The concave face of th^ great mirror is forty-eight inches of polished surface in diameter!...was 2,118 pounds, of which it must have lost a small part in polishing. The method of observing by the telescope is by what Herschel called the front view...
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The Penny Mechanic and Chemist: A Magazine of the Arts and Sciences

1841
...seaming, well known to those who make iron funnels for stoves. The concave face of the great mirror, is forty-eight inches of polished surface in diameter...half; and its weight, when it came from the cast, was 2118 pounds, of which it must have lost a small part in polishing. The method of observing by this...
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