companying photographs area few of many these six sails was pivoted in the center so that they In Fig. 2, A is the column of air which strikes on experiments that have been tried—the general results might take any angle. The first plate or sail was set may be stated as follows: at the angle shown… … Fig. 8. I have almost always been able to speed a boat up Fig. 6. ACTION OF WIND ON SAILS. and increase her windward work materially by relac- ing it on the boom, as shown in Fig. 13. gles to the wind are materially benefited by having column of wind does not lose its dimensions very much. Figs. 3…
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