The strainer, on which crayon paper or any kind of photographic enlargement is to be mounted, should be the same size as the intended picture. The frame is made of four strips of pine wood, two inches wide, one inch thick on the outside, and three quarter inch on the inside, making a quarter inch bevel on the inside edge of the face; these are nailed together and glued. To this, tack a piece of bleached muslin, free from knots and rough places, which has been cut two inches larger each way than the frame. Use six ounce Swede upholsterers' tacks, placing one in the centre of the outside edge of one side and another directly opposite, stretching the muslin as firmly as possible with the fingers. Then place a third tack in the centre of the outside edge of the top, and a fourth in the centre of the bottom of the frame, stretching as before. In finishing, use the pliers in addition to the fingers, and remember that you must always stretch from the centre towards the corner or you will have wrinkles in the muslin. As this process should be thoroughly understood, I will give minute directions for completing the operation. Having already placed the four tacks as above, stand the strainer on its bottom edge on the floor, with the back towards you, and put in the fifth tack two inches to the right of the third, that is, the one on the top previously mentioned. Instead of stretching the muslin directly back in a straight line towards you and at right angles to the fourth tack, you must draw it with the fingers towards the right hand corner. Then finish stretching, and tacking this edge to the right hand corner of the top, placing the tacks two inches apart and taking care to only draw the cloth sufficiently to have it perfectly smooth and straight on the edges, leaving the stretching to be done with the pliers; then turn the strainer on the side edge and tack at two inch intervals from the centre of the other (that is the upper) side to the right hand corner, same as before, and then tack half of the bottom edge and half of the other side in the same way. You will observe that you now have only one half of the muslin tacked—that is, one half on each edge—and you then complete the tacking, using the pliers to thoroughly stretch the muslin. This method has the advantage that you can stretch the muslin on the strainer and get it on better and in less than half the time required by the old method; also that you stretch the whole surface of the muslin with the pliers, and do it with only half the work.