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| Use a long nail as the answer stick. Make its
connecting wire from a 3-foot length of insulated wire. Strip
about 3-inches of insulation from one end and wrap the
bare wire tightly around the nail (near its head).
Connect the wire’s other end to one of the battery terminals, then run a wire from the other battery terminal to the machine. The answer bars are the front contact of each pair of switch contacts. Label them “A,” “B,” and “C” with paint or crayon. Similarly, label the three answer lights. Make each question card from a 5 by 6-inch piece of thin cardboard. Think up a question first. Then, find out the correct answer and make up two wrong answers. For example: Lewis Latimer was a member of a unique group of electrical scientists. What was the group’s name?
B. THE TELEPHONE WORKERS OF AMERICA C. THE EDISON PIONEERS Carefully print the question and answers on the question card. Next, cement a piece of aluminum foil about 1 inch by 2 inch to the cardboard at the appropriate location. For the question above, the foil goes at location “C.” Important: The piece of foil must run around the bottom edge of the card, with half the foil on the front side and half the foil on the back side. In this way, the foil connects the front and rear switch contacts when the card is inserted into the machine. When you make up different question cards, be sure to vary the location of the correct answer from card to card. Some correct answers should be at “A,” some at “B,” and others at “C.” One final point: If your friend sees the question card before you put it into the machine, he may notice the location of the piece of foil, and learn the correct answer before he reads the question. To prevent this, you can put “dummy” pieces of foil on the front of the card at the two unused locations. Make sure that these dummy pieces do not loop around the bottom of the card, so that they can not touch the rear switch contacts. |