A triad picture is simply three pictures in one-, from a standpoint exactly in lront of it a certain view, represented by X (Fig. 1), is seen. From a point a little to the right-hand side is seen a totally different visw, represented by V (Fig. 2); while movement to the left discloses a third picture Z (Fig. 3). The construction is very simple. First get three pictures and select the central one. For the purpose of description, suppose it to be 13in. wide; the height is not material at present. On the back of the picture rule pencil lines, dividing it into thirteen divisions, each lin. wide, and mark these divisions X/1,X/2,X/3, and so on, as shown on Fig. i. Next take the picture represented by V (Fig. 2). Suppose it to be 12 in. wide; on the back rule pencil lines, dividing it into twelve divisions, Y/1, Y/2 ,Y/3, and mark the divisions Y/1,Y/2 ,Y/3, and so on, as shown on Fig. 5. Space the third picture (also 12 in. wide) into twelve divisions, and mark each Z/1,Z/2,Z/3 etc., to Fig. 6.

Next take a sheet of paper (lining wall paper will do), 37 in. long, and in width equal to the height of the pietures. Divide it into thirty-seven parts, and mark each A/1,A/2,A/3 etc. (Fig. 7). Now, with a very sharp knife cut off the central picture the slip marked X/1 (Fig. 1), and paste it on the division marked (Fig. 7). Next take the Z or left-hand picture and cut off the slip marked Z/1 (Fig. 6), and paste it on A/2 (Fig. 7). Then off the Y or right-hand picture cut the slip - (Fig. 5) and paste it on (Fig. 7). Now return to the X picture, and cut off the slip X/2(Fig. 4) and paste it on A/4 (Fig. 7), and so on, until all the slips are pasted in the order shown on Fig. o.

Now fold the combined picture on a piece of millboard slightly larger than the central picture, paste down the first strip X1 (Fig. 8), paste Z1 and Y1 back to back, secure X2 close to the first strip, put Z2 and Y2 back to back, and so on (see Fig. 9). If the pictures are comparatively uarrow, say 9 in. or less from top to bottom, do not cut the centre one but paste it on a sheet of card, which should be lin. larger all round than the picture. Now glue a 1-in. by lin. wood slip, neatly mitred at the angles, round the edges of a sheet of stout millboard, make saw cuts 1/2in. long and lin. apart in the top and bottom pieces, and fix the frame round the picture. Paste the other pictures on paper having 1/2-in. margins at the top and bottom. Cut them into 1-in. strips, paste corresponding strips back to back, run the brush along the proper edge of the connected strips, and fix the ends into the 1/2-in. saw cuts. If the centre picture is wider than the others, the height of the upstanding strips will be less than the width of the centre picture strips; when uprights and flat strips are of equal width, as in Fig. 9, shadows are apt to interrupt the side views. Spaces as X1 in Fig. 9, 1 in. wide, with uprights Y2 3/4 in. high, will suit a centre picture 15in. wide, and two others 104 in. wide, or one 10 in. wide, two 6in; in. wide, etc.; dimensions respectively of lin. and 1/2 in. suit a centre picture 15 in., and two other 7 in.; and dimensions of 3/4 in. and i in. suit a centre picture 12 in., and two others 7A in. Oleographs and photographic enlargements make good triad pictures. Triad signboards having worded announcements are made as in the section (Fig. 10) with wedge-shaped pieces having 1-in. sides and 1/2-in. base. Paint these same as ground, and put a letter in each division.

Fig. 3.

Fig. I.

Fig. 2.

Fig. 6.

Fig. 4.

Fig. 5.

Fig. 7.

Fig. 8.

Fig. 9.

Fig. 10. Making Triad Pictures.