Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 81
in the plane of the Y executed by thestem of the Y only, the period in t = 2tt *Jl/g. So the ratioof the periods is given by r = s/L/1, and by altering the Land I, r may be made what we please. To form a trace ofthe path the funnel may contain fine silver sand which isreceived on a blackened… … Fig. 19.—Blackburns Pendulum. friction where set. It is also desirable to have packingblocks or wedges under the board to bring it near to thefunnel, as if too far away the sand spreads too much. Thebob may be a simple ring of lead round the funnel, or a pieceof cast metal turned and bored true. Of…
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