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The larger and a small test tube were cut to scale size (about 7cm tall) and set the size scale for everything else. The small test tube is inserted into the large test tube and presses on the target fluid, mimicking the inner jar. Gingerbread is used for the donut-shaped heating plate, which keeps the real target at 13C. The base flange is another disc of gingerbread and forms the base of the detector. A large gingerbread disc sits underneath as the floor of the water tank. 2/N
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