This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
In making a papier-m;lche mask, tear into pieces about 3 in. square some good porous brown paper and soak the pieces in cold water. then make sufficient good flour paste, mixing with it a little hot glue. \\ hen the paste is cold, it should be thick and tenacious. "When the paper has been well soaked, squeeze the water out of it, paste the paper on both sides, and lay the pieces together in a heap to keep them moist. Masks are usually made from a plaster-of-Paris mould in the following manner. The mould is first lined with pieces of oiled tie-sue paper to keep the papier-miche from sticking to the plaster: the pasted brown paper is then pressed into the mould piece by piece until the desired thickness of the mask is obtained. When partially dry the mask is lifted out, and when thoroughly dry it is ready for painting. Any number of masks may be made from the same mould. The model from which the plaster mould is made is generally cut from a wooden block, or is may be mould d in clay, or a cast may be taken from another mask. Place the model, previously rubbed all over with sweet oil, in the centre of a. square .en box large enough to allow 2 in. of plaster all round the model, and pour in the liquid plaster until the box is full.
When the plaster has set,lif1 out the mould and touch it up if necessary by scraping with a sharp knife.
 
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