Gee-haw whammy diddle

A Hui- machine, also known as Hui- Hui machine, Hui -Rad, Hui- Hui wheel, Hui- wheel, Hui- Hui- wheel, Magic windmill, magic screwdriver or magic propeller, is a simple wooden toys, which consists of two wooden rods consists of: One is repeatedly scored and typically provided at one end with a nail on which to rotate a propeller- like piece of wood loose; the other wooden rod is rubbed by the player on the scores. Thus, a player who knows the trick of Hui- machine, the " propeller " controlled in a right - or left-wing rotary motion put.

Trick

In the simple rubbing of the wooden bars of the propeller of the Hui machine usually starts not to turn itself. For that, it is necessary to additionally carry along when rubbed a finger or thumb on the notched wooden stick and either exert an angle from above or obliquely downward pressure on him. Since this is not apparent to the uninformed viewer, changing the direction of rotation of the exclamation "Wow " may be accompanied, which acts as a supposedly magic formula.

Physics

In fact, the function of the machine Hui is because the heat generated by the rubbing of the vertical vibration of wood notched rod is converted by the thumb in an elliptical vibration. Nail transmits the elliptical vibration on the propeller and puts it into a rotational movement.