USGS Multimedia Gallery
Title: Open-sight Alidades
Description: Open-sight Alidades. This type of alidade is a straightedge with a sighting device parallel to the edge. Early alidades were simple bars with open sights on either end, while telescopic alidades were introduced in the early 1800s. The examples here of solid brass and an early plastic/wood combination. Object ID: USGS-000629, USGS-000631
Location: Reston, VA, USA
Date Taken: Jul 13 2009
Photographer: Justin Bongard , U.S. Geological Survey
Usage: This image is public domain/of free use unless otherwise stated. Please refer to the USGS Copyright section for how to credit the photo.
USGS museum collection
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