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 69
... experiments , a very material increase of light has been obtained . The mean of ten experiments , made lately with every precaution , gives for the light emitted by lime , when exposed to this intense heat , eighty - three times the ...
... experiments , a very material increase of light has been obtained . The mean of ten experiments , made lately with every precaution , gives for the light emitted by lime , when exposed to this intense heat , eighty - three times the ...
Page 71
... the sun's reflection as a point of observation being established by the result of these experiments , the problem to which Drummond addressed himself was to invent an instrument , simple in THE DRUMMOND LIGHT AND HELIOSTAT . 71.
... the sun's reflection as a point of observation being established by the result of these experiments , the problem to which Drummond addressed himself was to invent an instrument , simple in THE DRUMMOND LIGHT AND HELIOSTAT . 71.
Page 80
... experiments , he devised a singular mode of bisecting a reflected image of the surface - a ghost , as he called it ; but it did not help him to any practical result . He at length , says General Larcom , abandoned the subject from a ...
... experiments , he devised a singular mode of bisecting a reflected image of the surface - a ghost , as he called it ; but it did not help him to any practical result . He at length , says General Larcom , abandoned the subject from a ...
Page 81
... experiments for forming the new measuring 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 ...
... experiments for forming the new measuring 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 ...
Page 84
... experiments , published in the " Philosophical Transactions " for 1715 , he laid the foundation for the subsequent inquiries and improve- ments which led up to the measuring bars . His pen- dulum consisted of a steel rod , carrying a ...
... experiments , published in the " Philosophical Transactions " for 1715 , he laid the foundation for the subsequent inquiries and improve- ments which led up to the measuring bars . His pen- dulum consisted of a steel rod , carrying a ...
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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