Page:Popular Science Monthly Volume 90.djvu/779

 Popular Science Monthly

��763

���A rectangular frame is built up and a board bottom put in ; then the engine is mounted in the front part and covered with a wood hood, the rear end of the chassis having the seat and battery boxes

��over the battery boxes. The adjusting of the sheet metal is not difficult if the lines are kept straight and no sags or depres- sions are allowed to form. It is only neces- sary to build a light frame over which the metal is bent and fastened with nails or wood screws. Because the sides of the frame are low there is no need of doors for entering the car. The seat may be raised somewhat and upholstered to add to the appearance of the car. When the metal covered chassis is painted and striped up the effect is very neat. — Cleage Field.

��An After-Dinner Trick with a Table Fork

THIS makes a clever after dinner trick, the requisites for which are always at hand — a silver fork and a glass of water. A glass of tea will suffice and is a good substitute for the glass of water; in fact any glass containing a liquid will do. The fork is taken up and held in the left hand, as shown in the illustration. A glass of water is placed 2 ft. away towards the center of the table. With the thumb and second finger of the right hand pinch together the prongs of the fork, using the nails on the extreme tip ends and pulling

��the hand away quickly. This will cause the prongs to vibrate and produce sound- waves. After pinching the fork-prongs and producing the sound-waves the right hand continues toward the glass of water where the feint is made of throwing the sound into the glass of water. Strange to say the sound will seem to enter the glass and distinctly repeat itself. Allow someone to try it and they will fail. Here is the secret. Hold the fork in the left hand with the handle about I in. from the table top. At the mo- ment the feint is made of throwing the sound allow the handle of the fork to touch the table. This produces the desired effect as the sound vi- brates through the table into the glass. No one will observe the resting of the fork handle on the table as all attention is diverted towards the glass. A trial will convince a person that the majority of onlookers actually believe the sound is picked off the fork and thrown into the glass. — Clarence T. Hubbard.

���Pinching the fork prongs to- gether to induce the vibrations

�� �