Page:A Voyage in Space (1913).djvu/65

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THE STARTING-POINT, OUR EARTH

45

Note on the Gravity Experiment

The arrangement described on p. 22 is called a "Peaucellier Cell," and can be used to draw a straight line. It was Sir G. H. Darwin who first pointed out that it could be used to illustrate gravity.

Voyage in Space page045.png

Fig. 8.

Notice that (Fig. 8)

Since KA and AS are a string and a rod of constant