contact slide base line apparatus

contact slide base line apparatus

A modified contact base line apparatus consisting of two steel measuring bars (rods), each 4 meters in length, so mounted that contact was effected by making lines on a rod and a contact slide coincide. Each rod formed a metallic thermometer with two zinc tubes, one on each side of the bar; opposite ends of the bar were fastened to one end of each tube while the other end was free to move as temperature changed.

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Industry/Domain: Earth science
Category: Mapping science
Company: American Congress on Surveying & Mapping
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