Next morning, soon after breakfast, Mrs. Trenchard set off for the market town, driving one of the light carts herself.  The farmer went off to his mangold fields; the maids were busy in the dairy across the yard; and the inventors had the house to themselves.  The simple materials they needed were easily obtained, and within an hour the novel sweeping apparatus was ready.  It had been decided that Templeton should climb to the roof, while Eves remained in the room to see how the invention succeeded.