Memoir of Thomas Drummond, R.E.,F.R.A.S., Under Secretary to the Lord Lieutenant of Ireland, 1835-1840 |
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Page 81
... bars with which it was intended to measure the base at Lough Foyle . Late in the autumn he again took the field . The station this year was Slieve Donard , in the County Down . Drummond joined the camp in October , and continued there ...
... bars with which it was intended to measure the base at Lough Foyle . Late in the autumn he again took the field . The station this year was Slieve Donard , in the County Down . Drummond joined the camp in October , and continued there ...
Page 83
... bars which were employed in the measurement of the base ; and the second are those connected with the process of measurement itself , and employed for testing and securing its accuracy as it went along . In using simple rods or chains ...
... bars which were employed in the measurement of the base ; and the second are those connected with the process of measurement itself , and employed for testing and securing its accuracy as it went along . In using simple rods or chains ...
Page 84
... bars with which the base at Lough Foyle was measured were so constructed as to be self - compen- sating for changes of temperature . Certain points near their extremities maintain the same distance from one another at all temperatures ...
... bars with which the base at Lough Foyle was measured were so constructed as to be self - compen- sating for changes of temperature . Certain points near their extremities maintain the same distance from one another at all temperatures ...
Page 85
... bars and brass bars for pendulum purposes , before the subject was thought of in connection with geodesy.t The French geodesists were the first to employ com- pound measuring bars to measure base lines . But in the French bars , the ...
... bars and brass bars for pendulum purposes , before the subject was thought of in connection with geodesy.t The French geodesists were the first to employ com- pound measuring bars to measure base lines . But in the French bars , the ...
Page 86
... bars . Harrison's pendulum was in common use ; and that self - compensating compound bars might somehow be formed , was as obvious as that pendulum was familiar . It seems to be generally ad- mitted that the inventor of the measuring bars ...
... bars . Harrison's pendulum was in common use ; and that self - compensating compound bars might somehow be formed , was as obvious as that pendulum was familiar . It seems to be generally ad- mitted that the inventor of the measuring bars ...
Other editions - View all
Memoir of Thomas Drummond, R. E. , F. R. A. S. , Under Secretary to the Lord ... John Ferguson McLennan No preview available - 2020 |
Memoir of Thomas Drummond, R. E., F. R. A.S., Under Secretary to the Lord ... John F. M'lennan No preview available - 2016 |
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