This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
A penny squeaker is used to produce the peculiar squeak by professional Punch and Judy men for their performances, but, as a rule, these instruments are too large and roughly made. Pronounce the word "cow" or "come," and notice where the hinder part of the tongue touches the roof of the mouth. This is where the instrument must be placed, and held in position by the tongue pressing it against the palate, while the front portion of the tongue, the lips, and cheeks are left free to modulate into words the sounds produced by blowing through the squeaker. A serviceable one may be made of two pieces of tin, lin. by 1/2 in., slightly curved, with a silk ribbon, 3/8 in. broad, stretched tightly between and wrapped round once or twice. The whole is tied round with thread. The corners should be cut off the pieces of tin, or they will injure the roof of the mouth. The silk produces a clean, smooth voice, although for open-air performances, where a very loud voice is requisite, ordinary tape in a larger squeaker is preferable.
 
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