1F20.36 - Embroidery Hoop and Pen
Balance the embroidery hoop over the mouth of the milk bottle. Place the pen on the top of the hoop directly over the mouth of the bottle (Positions are marked on the hoop). With a sweeping motion snatch the hoop out from under the pen. The pen will fall into the milk bottle.
- Martin Gardner, "Bottle, Hoop, and Dime", TPT, Vol. 32, #2, Feb. 1994, p. 80.
- Martin Gardner, "Bottle, Hoop, and Dime", Science Tricks, p. 39.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.