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If your magnetometer did not spring-to-life then you will have to turn off the circuit and remove the power supply, and look the circuit over carefully to make sure you didn t install a component incorrectly Grab your schematic, parts layout diagrams and charts and let s take a closer look at the circuit board Remember we talked about certain components, like capacitors and diodes having polarity Make sure that you installed the electrolytic capacitors and diodes with respect to their proper polarity; this is common cause for error If need be, have another person, such as a parent or skilled technician or engineer or knowledgeable friend, look over the circuit for you The same person looking over the same circuit numerous times often prevents you from finding your errors; you need a fresh look from another person to catch mistakes Another cause for error is placing the integrated circuits in the wrong socket or in the wrong direction in the socket After looking the board over carefully, you can re-apply the sensor and power supply connections and test the circuit once again, hopefully it will work fine this time around Once you know the magnetometer and sensor circuits are working properly, you can make provisions for mounting the sensor in a water-tight PVC case The remote flux-gate sensor probe was mounted in a 21 2 12 length of PVC pipe Circuit board guides were epoxied to the inside of the PVC pipe to allow the circuit board to be slid into the PVC pipe One 21 2 end cap was cleaned and cemented to the outside probe end of the PVC pipe A 1 2 hole was drilled and tapped in the center of the second PVC

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end cap Try to use as little metal as possible when mounting the sensor in the PVC pipe, use brass or plastic screws where possible A brass nipple fitting cemented in the tapped hole allows the three conductor cables to exit the probe assembly in the PVC pipe Before cementing the final end cap to the PVC pipe you will want to test the Earth-Field magnetometer before burying the sensor probe assembly Since the sensor is NOT an expensive temperature referenced or compensated type sensor it is subject to extreme temperature variations, so if you live in the northern climate zones, it will be necessary to mount the sensor underground, below the frost-line, to prevent temperature swings from affecting the reading of the meter In most frost-prone areas, you will need to mount the water-proof sensor assembly about 4 to 41 2 underground The sensor should be mounted as far away from metal objects and traffic as possible to ensure the best results The sensor package should be mounted so that it will face North-South as shown in Figure 18-3 The output of the magnetometer can be connected to a logging digital multi-meter, so the imported data can be later analyzed by your personal computer You could also use an inexpensive portable data-logger such as the HOBO series from Onset Computers, or you could use an analog to digital converter card in your PC to collect the data sample over time If your meter is set to the most sensitive position, and everything is in working order, you should easily be able to monitor the Earth s diurnal variations twice a day You should also be able to detect strong magnetic storms on the Sun, with your new magnetometer

gas engine that powered farm equipment from 1908 until rural electrification killed it off in the 1930s Decrouez s interest in miniatures is so great that he not only wears a jeweler s loop (magnifying eyepiece) when making models, he carries one wherever he goes He has created his New Holland model entirely from scratch He made thirty-three castings for its machine parts and markets each engine assembled and ready to run All moving parts are brass, except for a steel crankshaft, stainless steel cylinder walls, and aluminum pistons Instead of the splash-feed lubrication of the original, Decrouez adds a few drops of oil to the gasoline he uses This, and battery-fired ignition instead of a magneto, are his only departures from authenticity It s a thrill to see this little engine run It fits comfortably in the palm of your hand, including its wood base To start it, Decrouez inserts gas into a tiny reservoir from a metal squeeze can with a hypodermic spout He spins one of the twin brass flywheels a few times, and it starts up After an initial hesitation, it settles into the odd, loping rhythm of the original Only the exhaust note emanating from the scale-size muffler differs from the real thing It is a bit higher on the chromatic scale Pierre Decrouez markets his engine through appearances at vintage engine and model shows Advertising is word-of-mouth Clearly, that s all he needs He has orders as of this writing for the first fifty working models, complete even to one-sixth-size patent plates containing one-sixth-size consecutive serial numbers The price for these tiny engines run up to $1,200 each Ironically, this is about one-sixth the price of a full-size New Holland if you could find one in fine working order

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