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Published in "The History and Practice of the Art of Photography; or the Production of Pictures Through the Agency of Light" (New York: G.P. Putnam, 1849), p.57
Head Rests. The button head rest with chair hack clip, A fig. 19 is much the best for travelling artists, as it can be taken apart, into several pieces and closely packed; is easily and firmly fixed to the back of a chair by the clamp and screw a and b, and is readily adjusted to the head, as the buttons c,c and arms d, d are movable.
Sometimes the button rest is fixed to a pole, which is screwed to the chair; but this method is not so secure and solid as the clip and occupies more room in packing. Both the pole and clip, are furnished in some cases with brass band rests instead of the button; but the only recommendation these can possibly possess in the eyes of any artist, is their cheapness. Fig. 19.
For a Daguerreotypist permanently located the independent iron head-rest, B fig. 19, is the most preferable, principally on account of its solidity. It is entirely of iron, is supported by a tripod a of the same metal and can be elevated by means of a rod (b) passing through the body of the tripod, to a height sufficient for a person, standing, to rest against.