This is an extremely durable low cost Hall’s Carriage with the added feature of an adjustable sail. -- It is constructed with low friction ball bearings and tough plastic to take all the abuse a typical school lab can dish out. A hole at one end allows string to be attached for inclined plane experiments. -- With the addition of a fan you can conduct further experiments in wind power, force and resistance.

$14.25

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Bituminous Coal

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