Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 35
readwith great accuracy. The attracting masses were moved fromone position to the other by rotating the top of the case. Adiagram of the apparatus is shown in Fig. 8 on a scale ofabout \. The value obtained by Boys is probably the most accurate 22 GENERAL ASTRONOMY yet determined. He found for the… … Fig. 8.—Boys Torsion Balance. mass to be hung from one arm of a balance and counterpoisedby another mass at the end of the other arm. If a heavy massis introduced beneath the suspended mass, it will exert ashght additional pull upon it, causing an apparent increasein weight which can be determined…
Astronomy
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