An Account of the Manner of bending Planks in His Majeſty’s Yards at Deptford, &c. by a Sand-heat, invented by Captain Cumberland.
By Robert Cay, Eſq;
The place, where the Planks lie to be ſoftened in the Stove, is between two Brick-Walls; of ſuch a length, height, and diſtance from each other, as ſuffice to admit the largeſt, or to hold a good number of the ſmaller Sort: the bottom is of thick Iron Plates, ſupported by ſtrong Bars; under the middle of which, are two Fire-places, whoſe Flews carry the Flame towards the Ends.
The Planks are laid in Sand; the loweſt about ſix or eight Inches above the Iron-Plates, they are well cover’d with the Sand, and Boards laid over all, to keep in the Heat. The Sand is moiſtened with warm Water, (for which purpoſe they have a Cauldron adjoyning to the Stove) and if the Timber be large, and intended to be very much bent, ſo that it muſt lie long in the Stove, they water the Sand again, once in 8 or 10 Hours.