This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The projecting swinging glass-faced sign affords a permanent advertisement, and is made easily. The design should firsl be drawn in every detail. Next get a deal board about tin. thick and of the width and height of the shield, or whatever shape determined. Lay a pa] pattern of the design on the board, mark round with a pencil, and with a. keyhole saw cut out the shape, taking great care not to crack any of the corners or in any way damage the curves in working. Round this shaped board is put a l 1/2-in. rim of thin hoop-iron, having holes punched in the centre in various places, as well as two holes to screw in the hooks for hanging, as shown partly in the accompanying illustration. Then bend the rim round the wooden shield and fix with round-headed screws. When this is overlapped at the top about 1 1/2 in. for strength, there will be 1/2 in. of rim on each side, which is ample for glazing. "Next take the paper template and cut off about 1/8in. bare all round, and have two glasses cut to this size in 15 oz. clear glass. Try them in the shield frame, and see that they fit easily and do not pinch at any of the corners. Then set out the wording for the sign, which must be put on the back of the glass and backwards.
The way to do this is to make the drawing upon tracing paper, which, when turned over, presents the lettering backwards and ready to place beneath the glass; then trace in the colour desired. The enamel-paints sold in small tins would do well for this work, and, being supplied in many varieties of colours, afford a choice and scope for arrangement. Of course, in choosing colours for an advertisement, striking contrasts, not too glaring, are the best, as they draw attention. Using white letters with a chocolate background, or black letters with white or sky blue background, and so on, any number of different arrangements can be applied, and it remains with the worker to choose the colours so that the projecting sign, when finished, will not look unsightly if compared with its surroundings. Get a small brush called a writer, and trace in all the letters in the desired colours, taking care to keep the colours properly thinned with turpentine and not to get a thick body of colour on that will take a long time to dry. When all the lettering or design is traced in, put aside for a day or two to get thoroughly dry and hard, and then paint in the background with an ordinary sash tool.
Of course, there will be two glasses to do, one for each side of the sign, and different wording can be arranged, so that there will be two announcements on one sign. When both glasses are finished they are ready for glazing. The putty for this should be mixed with a little colour, making it the same, or nearly the same, as the colour of the background. Lay the glass in the frame and putty round. The bracket is made with three pieces of iron. The upright, to be screwed to the wall, is a piece of sheet-iron about 2 in. wide, with holes for screwing. The projecting bar is fixed to the upright and curved at the end, and the support at ,the top is riveted to the upright and horizontal bar as a strengtheuer for the latter, which supports the sign. The sign should not be fixed lower than 7 ft. from the pavement.

A Projecting Swinging Sign.
 
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