Milwaukee School of Engineering - EMF Yearbook (Milwaukee, WI)

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■ i • k =£4 fTffiE 192© EMF- ' ..... —— “' “But, Mr. Gilmore has two push-buttons on his desk. There is a buzzer for the stenographers and a buzzer in the outer office too. The two circuits, then, look like this:” CL E Rsr Fc srr-jBtfrroAf J30ZZEX N oaree Office un SECOND PVSH-eUTTON jBVZZER 1 STENOqEARNERS Room “Now, the first thing I did was to find out if the push-buttons were all right and the way I did that was to take a small wire and “cut-out” the push- buttons by connecting the wire to each side .of the push-buttons to furnish a path for the electricity to go around the push-buttons like this:” □ cur oar mres mi n “Then if the push-buttons are out of order, the buzzers will ring. Well, the buzzers didn’t ring, so I tested out the dry cells of the battery separately, leaving the push-buttons “shorted,” and I found the buzzers rang with two of the cells; one was “dead.” So I connected the two “live” cells together again (in scries) as I did at home and the buzzers rang. I then: removed the “jumper” across the push-buttons and asked Mr. Gilmore to try the buzzers. Well, Jimmie, you should have seen the look Mr. Gilmore gave me when they worked. He didn’t think 1 could lix the buzzers, but 1 showed him.” Page Three Hundred Thirty-four

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 THB i p20 EMF ——•— -— — “It’s fixed!” The red-headed office boy popped into Mr. Gilmore’s private office and suggested that he push the button. He did so and the buzzer sounded. “Red” had saved the day, and that same afternoon he was Mr. Gilmore’s guest at the ball game. “That was a fine ‘stall’ you made yesterday. What do you know about electricity,” “Jimmie” the multigraph boy sarcastically remarked the next morning. “Red” answered with pride, “Why, I’ve done a lot of electrical wiring. I’ve wired a bell in our home, I’ve fixed up the buzzers for the people who live upstairs, and I’ve fixed mv mother’s electric flat-iron. I know a lot about electricity. Now this job was different. “You see. Mr. Gilmore has two buzzers and I knew they must be wired the same way as the bells up at our house.” In a jiffy “Red” took out his pencil and roughly sketched the following diagram on a piece of paper: “Now the buzzers were connected up like this. All there is to know is that there is a complete circuit from the push-button to the buzzer and then to the battery and then back to the push-button, like this:” SHfS ) t • “That’s how 1 wired the bells at home,” “Red” continued, pointing to the diagram. “You see, by pressing the upper push-button it rings the bell upstairs and the lower one rings our bell. You see, Jimfinic, this is the way these offices are laid out:” w M Page Three Hundred Thirty-three

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MY TESLA TRANSFORMER I o clay there is a broad field open for the experimenter in the study and development of the so-called High Frequency Curents. The transformer to produce these High Frequency Currents was invented by Xikola Tesla, but many young experimenters have successfully made one in their own shops. 1 myself have one of these coils, which I made from materials at hand in my shop. A picture of this coil is seen below. This Tesla coil, as it is called after its inventor, is perfectly harmless to thti body, except that if the spark jumps direct to your skin it will burn the flesh. The Tesla coil which 1 made is eighteen inches long, eight and one- half inches wide and twelve inches high. The secondary coil is eighteen inches long and five and one-half inches in diameter wound with number thirty-six silk covered copper magnet wire. The primary coil is eight and one half inches in diameter wound in eighteen turns of number eight copper wire. 'I'his Tesla coil will give a four-inch spark by using a one inch spark coil and a very small glass plate condenser. L use the one-inch spark coil on the light circuit of one hundred ten volts by means of an electrolytic interrupter which I made myself. 1 made all the apparatus used in my high frequency current experiments, which includes the interrupter, spark coil, glass plate condenser, spark gap and Tesla coil. In addition to these experiments 1 have experimented in wireless teleg- raphy and with the arc furnace. I have a small wireless outfit and an arc light, both of which I constructed mvself. ELBERT FLOYD NICHOLAS. Ferris. Texas. P.iye Three Hundred Thirty-five