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FOR MANAGERS AND OPERATORS 613
wide will do. Any desired photograph may be attached to the card together with the lettering. The white paint is made of dry white lead and thin glue mixed thick enough to be easily applied but not thin enough to run. Being supplied with the advertising text matter any sign painter can make the card, or with practice even theatre managers may learn to do this fairly well, particularly if they secure books of architects' alphabets to use as a guide. A card should be printed in the proportions of 3^4 by 4 inches — that is to say, it may be any size, but in those proportions. Having finished the card, it is then photographed in the usual manner, and the positive print made, either by reduction or by contact if the negative is of slide size. In making up the card don't try to get too much reading matter in the allotted space, because the slide will only be projected for a few seconds, and if it is too long the audience will be unable to read it in full. Also too much ornamentation is a detriment, the plain slide being more pleasing and understandable than one containing an excess of "gingerbread." In making a slide it must be remembered that, whereas the slide itself is 3J4 or 4 inches the mat opening is only 2^4 by 3 inches, so that the positive print must include all lettering within a little less than these last named dimensions. Those who have made slidemaking a business say that for making the negative the regular slide plate is most satisfactory, and Defender, grade A, is pronounced excellent. For the development of the Defender, grade A, the following formula is given by Burton H. Allbee:
A: Water 10 ounces
Hydroquinone 75 grains
Potassium metabisulphite 5 grains
Potassium bromide 25 grains
B : Water 10 ounces
Sodium sulphite 1 ounce
Caustic potash 50 grains
If a slide size negative is used, the slide positive should be printed by contact. It is recommended that the exposure be five seconds at a distance of 3 feet, using ,a sixteen-candle power carbon lamp. Development s'hould be the same as for the negative.
If only one copy of a slide is desired, it may be made by writing on a white card with perfectly black ink, reversing the plate in the holder and stopping the lens down to make up for focus thrown out by reversal of the slide, and ex