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Номер объекта
A-333
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Geomagnetic
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Наименование
Compass
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Название
Dip circle and variation compass
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Создатель
W. M. Welch Scientific Company
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Описание
Degree circle painted 90-0-90-0-90° every 1°. Bracket crosses the diameter of the circle and rotating within a Y-bearing so that circle can be positioned vertically or horizontally. Locking screws on arms of Y. Center of bracket has compass needle axis with locking screws. Blue-silver needle type 7. Y-bearing supported on small plate calibrated for azimuth 0-90-0-90-0 degrees every five degrees. Plate rotates on a tribrach base with leveling-screw feet. Metal index attached to one leg. Bubble level in plate. Copper has textured grey finish.
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Материал
"W. M. WELCH SCIENTIFIC COMPANY/WELCH/ESTABLISHED 1880/1515 Sedgwick St., Chicago, U.S.A."
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Материал
copper, aluminum
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Тема
United States
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Размерность
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Imperial(in) |
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Metric(cm) |
| Height |
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28.3 |
| Width |
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16.3 |
| Depth |
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13.2 |
| Diameter |
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| Circumference |
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Imperial(in) |
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Metric(cm) |
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| Width |
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