#Best military protractor professional#

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.

#Best military protractor professional#

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. String shown is “guts” from 550 cord.This yellow xylonite (celluloid-like plastic) rectangular protractor is contained in a paper wrapper marked: MILITARY PROTRACTOR (/) MADE BY (/) KEUFFEL & ESSER CO. String not included, shown just for illustrative purposes. This is why the design of the UTM Grid Reader is a circle instead of a square.Ĭircular compass rose around the exterior 360 degrees.ĭurable and commercially produced for us by one of the leading protractor makers in the USA. My teammate from Max Ordinate Academy (Marine Scout Sniper) runs a string in a loop tied around the UTM Grid Reader which makes it much more effective. When the Military Map protractor is rectangular, it is less consistent to run the string. To do this, we run a string from the center of the UTM Grid Reader to the point on the map, and then check the edge of the tool for the direction we can use on the compass. We will often run 2 maps, a small 1:24000 map for more of an overview, and a 1:12000 map for double the detail, and so having both slot tools on a single UTM Grid Reader or Military Map protractor is a huge benefit.įinally we often use the tool to check or get an azimuth or direction reading. We wanted a 1:12000 grid slot tool, but they are extremely rare to find, and we tried using a corner marking tool, but they are not nearly as easy to use as the slot tools. The slot tools feature a slot along the vertical axis which make marking a point super quick and they are easy to read. We struggled to find the best tool since most UTM Grid Readers we prefer (also called slot tools) use a 1:24000 grid. See the other pictures for more information. In the main picture (a digital prototype), the pink/red is actually white around the outside edge (in the real life tool), and the slot cut lines are displayed as red lines. However we have been running a larger set of maps using a 1:12,000 scale so we can see more detail. The provided maps are 1:24,000 scale on a UTM grid. The main focus of this event is land navigation. Since 2016 Bison Tactical has participated in a 24-48 hour land navigation race called the Sniper Adventure Challenge. This is the Bison Tactical custom UTM Grid Reader. UTM Grid Reader | Military Map Protractor