Abney Level

Image: Abney Level

Detailed Description

A pocket instrument used in surveying which consists of a fixed sighting tube, a movable spirit level connected to a pointing arm and an arced scale graduated 0 to 90ยบ in both directions. When correctly used, the Abney Level is an accurate surveying tool used to measure degrees, percent of grade and topographic elevation. Manufactured by E.R. Watts & Son; serial #4709. E. R. Watts & Son was established in London in 1857. Object ID: USGS-000334

Details

Image Dimensions: 1191 x 507

Location Taken: US