The 'trim built wherry' of song has been improved off the face of the Thames. Originally it was purely a passenger craft: it contained space for two or more sitters in the stern, and was fitted for two pair of sculls or a pair of oars at option. Larger wherries were also built, 'randan' rig (for a pair of oars with a sculler amidships, or three pairs of sculls at option). Such boats were the passenger craft of the silent highway before steamers destroyed the watermen's trade. When match racing came into vogue, wherries began to be constructed for purely racing purposes; they had but one seat, for the sculler, and were carried as fine as they could be, at either end, with regard to the surf which they often had to encounter. Their beam on the waterline was reduced to a minimum; but at the same time it was necessary, for mechanical purposes, that the gunwale, at the points where the rowlocks were placed, should be of sufficient width to enable the sculler to obtain the necessary leverage and elevation of his sculls. The gunwale was accordingly flared out wide at these points, above the waterline. This flared gunwale had nothing to do with the flotation of the boat; it was in effect nothing more than a wooden outrigger, and it was this which eventually suggested to the brain of old Harry Clasper the idea of constructing an iron outrigger, thereby enabling the beam to be reduced, and at the same time the sculling leverage to be preserved without the encumbrance of the top hamper of these flared gunwales. Such was the old wager wherry, and its later development of the wager outrigger.