t the rate of 400 times air supply requiring regulation. Again, the air regu- helps in elevating the mast and which is just sufficient a minute, it successively closes the circuit between the to balance the dead weight of sail in a calm not inclin- lator fitted on the bottom cannot jam in the way… … derneath the car ordinary rig 200 THE UMBRELLA BOAT. similar to a trolley square feet of canvas pole. One of these was found too much pletely removed by the aid of a screwdriver in a few trolley wheels or shoes will rest continuously on the for this boat, but with the umbrella sail she carries 360…
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