#MILITARY PROTRACTOR PDF FULL#

Any angle can be measured with the vernier bevel protractor, but you have to be careful to note which part of a full circle you are measuring. Look at the measurements in Figure 11 to get you more accustomed to vernier bevel protractor reading. The total number of degrees and minutes in Figure 10 would equal 85 degrees and 30 minutes. Add this number of minutes to the number of whole degrees. Always read the vernier in the same direction that you read the dial. Now, reading in the same direction (counter-clockwise), count, by five, from zero on the vernier scale to the lines that match up on the dial (Figure 10). The zero on the vernier scale is just pass the 85 degree mark. The degrees are read directly from the main scale. To read the protractor, note where the zero on the vernier scale lines up with the degrees on the dial in Figure 10. One-twelfth of a degree is equal to 5 minutes. Each space on the vernier scale is, therefore, one-twelfth of a degree. The vernier scale is divided into 24 spaces, 12 spaces on either side of the zero (see Figure 9). As with other vernier measuring devices, the vernier scale of the bevel protractor allows the tool to divide each degree into smaller increments. Degrees can be read directly off of the main scale, while the minutes are read on the vernier scale. The main scale is numbered to read from 0 to 90 degrees and then back from 90 degrees to 0 (Figure 9). The main scale is graduated into four 90-degree components. Measuring Acute Angles Measuring Obtuse Angles The main component of the bevel protractor is the main scale. Measuring applications for the universal bevel protractor. Using a protractor with a vernier height gage. Look at Figure 8 below to give you an idea as to the uses of the universal bevel protractor. The universal bevel protractor is capable of measuring obtuse angles as well as acute angles when accompanied with the correct attachments. The universal bevel protractor is capable of measuring to within 5 minutes or 1/12 of a degree.

The universal bevel protractor (Figure 7) is designed for precision measuring and layout of angles. The universal bevel protractor picks up where the blade protractor leaves off. Such devices are most commonly used in drafting of technical drawings such as architectural plans. By attaching a swiveling arm to the straight edge of the semicircular disk described above, lines with arbitrary angles can be drawn. Protractors are generally used for measuring existing lines, but they can also be constructed to help draw them. This allows them to directly measure all angles between 0 and 360. Astronomers often use a third type of protractor, one formed from a fully circular piece of material. An arm is placed along one line, and the other arm is swung outwards until it is parallel to the other line. The arc is attached to one arm, and the other arm slides freely over it. An alternate type of protractor is made from two straight edges attached to each other at one end, with a graduated arc between them.

They cannot both measure more than 180, as they must add up to 360, the number of degrees in a full circle. One direction will measure an angle greater than 180 degrees, and the other will measure an angle less than 180 degrees. This is due to the symmetrical nature of the circle starting from one line, the angle to a second intersecting line can be measured by moving either clockwise or counter clockwise. If the original placement of the protractor produces an angle greater than 180 degrees, simply flipping it over will provide a reading of less than 180 degrees. This is adequate in normal use, as the relationship between two lines can always be expressed as an angle of 180 degrees or less.

Because it is a half-circle, the basic protractor only measures angles up to 180 degrees. The straight edge is placed along one of the lines to be measured, and the number of degrees is determined by where the second line crosses the arc. A basic protractor consists of a half-circular piece of material with degree markings notched onto the outside edge of the arc, or curved section. The earliest known protractors were designed in the 17th century by sailors needing to plot courses on nautical charts. The angle is measured in degrees, and a circle is defined as having 360 degrees of identical size.

TFT Tools Inc Operation Instruction Universal Bevel Protractor A protractor is a device for measuring the angle between two intersecting lines.

Military protractor pdf