Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 132
ependon the degree of permanence and uniformity of action of springs, on theConstancy or variability of the effect of temperature, on their elastic force,on the possibility of transporting them, absolutely unaltered, from place toplace, &c. The great advantages, however, which such an apparatus… … shall be sustained by it just toswing clear of contact with theagate plate in the highest lati-tude at which it is intended touse the instrument. Then, ifsmall weights be added cau-tiously, it may be made to de-scend till it just grazes theagate, a contact which can bemade with the utmost…
Astronomy
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