 | Monthly literary register - 1821 - 678 pages
...to about an iuch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. 4. That in the same...other respect. 5. That polishing the needle has no effect on its magnetism. 6. That the best mode of communicating magnetism to a needle, appears to be... | |
 | Sir David Brewster, Robert Jameson - 1822 - 458 pages
...to about an inch from each extre mity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. — 4. That in the...capability of receiving magnetism, though not apparently dift'ering in any other respect. — 5. That polishing the needle has no effect on its magnetism. —... | |
 | 1821 - 538 pages
...extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. " That in the same plate of steel, of the size of a...though not apparently differing in any other respect. " That polishing the needle has no effect on its magnetism. " That the best mode of communicating magnetism... | |
 | William Newton, Charles Frederick Partington - 1821 - 538 pages
...extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. " That in the same plate of steel, of the size of a few square inches only, portions are found varying consi. VOL. II, 2 D derably ID their capability of receiving magnetism, though not apparently differing... | |
 | Sir David Brewster, Robert Jameson - 1822 - 456 pages
...to about an inch from each extre mity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. — 4. That in the...other respect. — 5. That polishing the needle has no effect on its magnetism. — 6. That the best mode of communicating magnetism to a needle, appears... | |
 | 1822 - 502 pages
...to about an inch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. " 4. That in the...though not apparently differing in any other respect. " 6. That polishing the needle has no effect on its magnetism. " 6. That the best mode of communicating... | |
 | Ralph Griffiths, George Edward Griffiths - 1822 - 572 pages
...in length to two . inches in width, this form being susceptible of the greatest directive force. ' That in the same plate of steel of the size of a few...though not apparently differing in any other respect. ' That the best mode of tempering a compass-needle is, first to harden it at a red heat, and then to... | |
 | 1822 - 452 pages
...extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. That in the same plate of steel of the size of a few...though not apparently differing in any other respect. That polishing the needle has no effect on its magnetism. That the best mode of communicating magnetism... | |
 | 1823 - 792 pages
...to about an inch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. 4. That in the same...other respect. 5. That polishing the needle has no effect on its magnetism. 6. That the best mode of communicating magnetism to a needle appears to be... | |
 | Walter Scott - 1823 - 780 pages
...to about an inch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. 4. That in the same...other respect. 5. That polishing the needle has no effect on its magnetism. 6. That the best mode of communicating magnetism to a needle appears to be... | |
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That the best mode of tempering a compass needle, is first to harden it at a red heat, and then to soften it from the middle to about an inch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear. 
