Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 36
will exert ashght additional pull upon it, causing an apparent increasein weight which can be determined by adding a small weightto the other pan. The weight added determines the attrac-tion between the suspended mass and the attracting mass. THE EARTH 23 and knowing this, the constant of… … Fig. 9.—Poyntings Gravity Balance. had a 4-ft. beam. The balance was supported in a case, toexclude draughts, above a turn-table whose axis was belowthe central knife-edge of the balance. On this turn-tablewas the attracting mass if of 160 kgm., which could be broughtunder each of the suspended…
Astronomy
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