![]() ![]() The interior of the protractor has cutout stencils for a circle, triangle, square, and two oblong shapes. Pinholes are at the origin point and in the upper left and right corners. Diagonal lines extend some of the measurement markings out to the edges of the rectangle surrounding the protractor. It is also divided by single degrees and marked by tens from 0° to 180° in both directions. This clear plastic semicircular protractor is divided by ten mils and marked by hundreds from 100 to 3,100 in both the clockwise and counterclockwise directions. ![]() The 1936 description matches the illustration printed in 19, as well as this example of the military protractor. Although the illustration is correct in the 1921 catalog, the description is of the form advertised in the 19 catalogs. (New York, 1936), 203 Catalogue of Keuffel & Esser, 39th ed. (New York, 1921), 119 Catalogue of Keuffel & Esser, 38th ed. (New York, 1916), 172 Catalogue of Keuffel & Esser, 36th ed. (New York, 1913), 172 Catalogue of Keuffel & Esser, 35th ed. Cooke, "Scales for Determining Slope from Topographic Maps," The Professional Geographer 20, no. K&E noted in the 1943 catalog that the changed form was manufactured according to the specifications of the Corps of Engineers. ![]() The design of the instrument changed again between 19. K&E began to sell this form of military protractor between 19, so this object may have been in use during World War I (as the markings suggest). Army Corps of Engineers in the 19th and 20th centuries. The United States Engineering Department was part of the U.S. ![]() Maker's and owner's marks are near the lower edge: KEUFFEL & ESSER CO. The first is marked by thousands of yards from 1,000 to 8,000 the second is marked by 500 yards from 500 to 2,500 and the third is marked by 500 yards from 500 to 1,000. Each scale is divided in 100-yard increments. Below that scale are three scales for 1", 3", and 6" to the mile, respectively. The scales for each set of slope measurements are not indicated, but they presumably are standard scales for American military engineering, such as 1:63,360 and 1:25,000.Ī scale of inches divided to tenths and marked by ones from 0" to 5" appears on the interior of the protractor. These allow draftsmen to read or draw topographical contours indicating slopes in landforms of 7° and 3-1/2° 8°, 4°, 2°, and 1° 10°, 5°, and 2-1/2° and 12°, 6°, 3°, and 1-1/2°, respectively. A small hole near the 160° mark permits a weight to be suspended so that the protractor functions as a rough clinometer, to measure angles of elevation or slope.įour slope scales appear on the bottom edge of the instrument. It is divided by degree and marked by tens from 10° to 170° and from 190° to 350°, both in the clockwise direction. Dimensions: 5.00" H x 5.00" W (MP-2) / 4.13" H x 6.This yellow xylonite (celluloid-like plastic) rectangular protractor is contained in a paper wrapper marked: MILITARY PROTRACTOR (/) MADE BY (/) KEUFFEL & ESSER CO.We stand by all of our products with a no-hassle guarantee if you're not satisfied for any reason we'll make it right. Whether you are an experienced navigator or a novice orienteering student, you will find these high quality protractors loaded with professional features. The compass rose features dual scales for mils and degrees.īoth feature accurate, clean edges, and the crystal clear acrylic material is highly flexible while being stronger and more durable than many standard issue protractors. The second is the rectangular MP-6 which is graduated in 1:25,000 and 1:50,000 map scales in both meters and yards for better versatility. The first is the square MP-2 which is equivalent to the Graphic Training Aid 5-2-12 Coordinate Scale and Protractor (GTA 5-2-12), which is the standard issue protractor for US and NATO military forces around the world. Compatible with UTM, MGRS, USNG and other metric based coordinate systems, the compass rose features dual scales with the Inner markings in degrees and outer markings is in mils. This package includes two different military-style map protractors that are great tools for experienced navigators, or those assembling their Ranger school lists ![]()
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