A strong wooden frame, called a "stretcher," is made of stout " quartering " of the size required, and fitted with wedges (as in ordinary canvas " strainers "), by means of which the frame may be slightly extended so as to tighten or stretch a layer of canvas spread over and secured to it by means of tacks. Take ordinary picture-liner's canvas, several inches wider each way than the picture to be lined, and tack it on to the frame. The canvas being strained or stretched, the back of the picture is carefully brushed over with a mixture composed of glue and " size," the face of the canvas being also brushed over with the same mixture. The picture is next laid back downward on the canvas, beginning at one corner and gently pressing it with the hand so as to disperse air-bubbles. The canvas is tightened by driving in the wedges at each corner of the stretcher. Take as many sheets of double-crown paper as will cover the entire picture (allowing each sheet to overlap the other about 1 in.); brush paste over one side of each sheet and fold separately.

When the required number of sheets of paper have been thus prepared, take the first sheet, open it, and lay it carefully on the picture, beginning at one corner, and press it as before with the hand so as to remove air-bubbles. Each sheet is to be laid on in the same way until the entire picture is covered. After being left for a time, and when the paper is dry, the picture is subjected to pressure from a heavy heated iron, somewhat resembling a tailor's goose. For this purpose a perfectly smooth board, equal in thickness to the timber with which the stretching frame is made, is placed beneath the picture, at one corner, and the heated iron (the temperature of which must not be too high) is thus applied with steadiness and care, the pressing-board being shifted (when a large picture is under treatment) until the whole surface of the picture is well pressed. When the canvas is perfectly dry, the paper is removed by a sponge and warm water. When all traces of paper and paste are removed from the surface of the picture, the latter is removed from the rough stretcher, the canvas neatly trimmed, leaving sufficient margin to attach it to a new strainer of a size suitable to the picture; the canvas margin is then tacked on to the edge of the frame in the usual way, after which the wedges are driven tight.