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COMB (a word See also: toilet used for cleaning and arranging the hair, and also for holding it in place after it has been arranged; the word is also applied, from resemblance in See also: form or in use, to various appliances employed for dressing wool and other fibrous sub-stances, to the indented fleshy crest of a See also: cock, and to the ridged series of cells of See also: wax filled with honey in a beehive
.
Hair combs are of See also: great antiquity, and specimens made of See also: wood, See also: bone and See also: horn have been found in Swiss lake-dwellings
.
Among the Greeks and See also: Romans they were made of See also: boxwood, and in See also: Egypt also of ivory
.
For See also: modern combs the same materials are used, together with others such as See also: tortoise-See also: shell, See also: metal, See also: india-See also: rubber and celluloid
.
There are two chief methods of manufacture
.
A See also: plate of the selected material is taken of the See also: size and thickness required for the comb, and on one See also: side of it, occasionally on both sides, a series of See also: fine slits are cut with a circular saw
.
This method involves the loss of the material cut out between the teeth
.
The second method, known as " twinning " or " parting," avoids this loss and is also more rapid
.
The plate of material is rather wider than before, and is formed into two combs simultaneously, by the aid of a twinning machine
.
Two pairs of See also: chisels, the cutting edges of which are as long as the teeth are required to be and are set at an angle converging towards the sides of the plate, are brought down alternately in such a way that the wedges removed from one comb form the teeth of the other, and that when the cutting is See also: complete the plate presents the appearance of two combs with their teeth exactly inosculating or dovetailing into each other
.
In indiarubber combs the teeth are moulded to shape and the whole hardened by vulcanization
.
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