The Laws of Gravitation Memoirs By Newton Bouguer And Cavendish Together With
The Laws of Gravitation Memoirs By Newton Bouguer And Cavendish Together With
A Stanley Arthur Stanley Mackenzie
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C. V. Boys read before the Royal Society, in 1889, an important paper (175 and 176) on the best proportions and design for the torsion balance as an instrument for finding the gravitation constant. He shewed that the sensibility of the apparatus, if the period of oscillation is always the same, is in- dependent of the linear dimensions of the apparatus ; and re- marked that the statements of Cornu on this point (page 125) are not correct. There are great advantages to be gained by reducing the ...dimensions of the apparatus of Cavendish 50 or 100 times ; the main one is that the possibility of variation of temperature in the apparatus is enormously minimized. Then, too, the case can be made cylindrical and corrections for its at- 135 MEMOIRS ON traction avoided. Until quartz fibres existed it would have been impossible to have made this reduction in the dimensions of the 'apparatus and retained the period of 5 to 10 minutes. The introduction of this invaluable new means of suspension is also due to Professor Boys.
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