sentences:  While he might have begun constructing a glider at some stage in his life, no evidence can be found that verifies the claim he flew it.Based on Watson's rocking wing patent, it is assumed that his first powered machine was completed around mid 1909 since it is almost exactly like the illustration that accompanies the patent.Built within the workshops of the Tay Motor Boat and Engine Company of Dundee, the Watson No.1 had the upper wing being approximately one half the span of the lower wing.