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During World War I, the United States Engineers Corps used a specialized field compass that was crucial for military engineering operations on the frontline of the Western Front. The field compass was a crucial tool that helped engineers navigate through difficult terrain, accurately map areas, and plan strategic operations. This WWI field compass is in relic condition and shows great use and wear. The compass does not work and is missing the compass needle. This specific compass is a rare model made in Paris, France for AEF engineers.

The field compass used by the Engineers Corps during WWI was a modified version of the standard military compass. The compass had several key features that made it unique and useful for engineering operations. The compass had a sighting device that allowed engineers to take accurate bearings and a clinometer that measured the slope of the ground. These features were essential for creating detailed maps, determining the best location for building infrastructure, and planning strategic military operations.

The field compass was also designed to withstand harsh weather conditions and rough handling. The compass was made of brass and had a hinged cover that protected the glass face of the compass from damage. The compass was also mounted on a sturdy metal base that allowed engineers to take readings in the field without fear of the compass tipping over or becoming damaged.

One of the most important uses of the field compass was in creating accurate maps of the battlefield. Engineers used the compass to take bearings of prominent landmarks, such as hills, buildings, and trees. These bearings were then used to create detailed maps that were crucial for planning military operations. The compass was also used to measure distances and determine the elevation of different areas, which was important for identifying potential obstacles and determining the best routes for troops and supplies.

The field compass was also crucial for planning engineering projects, such as building bridges and roads. Engineers used the compass to identify the best location for these structures, taking into account the slope of the ground and potential obstacles. The compass was also used to ensure that these structures were built in a straight line, which was important for ensuring that they were sturdy and safe.

Overall, the WWI U.S. Engineers Corps field compass was a crucial tool that was used for both military and civilian engineering operations. Its accuracy, durability, and versatility made it an essential part of the Engineers Corps' operations during the war. Without this tool, the engineers would have had a much more difficult time navigating through difficult terrain, creating accurate maps, and planning strategic operations.