THE PEACOCK COMB.
The peacock comb consists of two common combs having strong needles separated from one another by 1/2 inch. These two combs are put together by means of a pasteboard frame in such a way that they can be moved 1/4 inch to the side.
Moved sideways the needles of one comb move to the centre between the needles of the other comb, they cover each other as soon as both combs are moved 1/4 inch in the opposite direction.