[nb-NO]Details[nb-NO]

A-333

Geomagnetic

Dip circle and variation compass

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.

"W. M. WELCH SCIENTIFIC COMPANY/WELCH/ESTABLISHED 1880/1515 Sedgwick St., Chicago, U.S.A."

c. 1930

copper, aluminum

United States

	Imperial(in)		Metric(cm)
Height			28.3
Width			16.3
Depth			13.2
Diameter
Circumference

	Imperial(in)		Metric(cm)
Height
Width
Depth
Diameter