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 28. 

We will now assume that you have become proficient enough to warrant an attempt at the construction of a real flying machine—one that will not only remain suspended in the air at the will of the operator, but make respectable progress in whatever direction he may desire

to go. The glider, it must be remembered, is not steerable, except to a limited extent, and moves only in one direction—against the wind. Besides this its power of flotation—suspension in the air—is circumscribed.