Put your protractor on the edge of the paper and the pencil line exactly as shown in Fig.
A in the drawing and also on the line of the scale of the protractor marked 30 degrees and then draw a line on the paper along the edge of your rule.
Thus a semicircular protractor is used with a separate straight edge, along which it is slid to the nearest meridian; another form is the simple circular protractor with a thread fastened at the center.
A direction is laid down on the chart or read from the chart preferably by using some form of protractor and measuring the angle from the projection lines.
A protractor laid on the chart with two of its arms set at the observed angle and passing through the two objects, will permit of locating two or more points of this circle on the chart.
Some form of combined protractor and parallel ruler should be in every navigational equipment, and it is unfortunate that these instruments are not better known in this country.
With a protractor on the chart note the angle between the objects at any point on the outer part of this circle.
If any time is left, spend it in marking courses with the protractor and handling the sextant.
Illustration] Another interesting application of this corollary may be seen by taking an ordinary paper protractor ACB, and fastening a plumb line at B.
The mirror is always at hand, and a paper protractor on a piece of board, with a plumb line attached, serves as a quadrant.
The approximate bisection (or any other division) of an angle may of course be effected by the help of the protractor and a straightedge.
In the absence of any outdoor work a protractor may be used to measure the exterior angles of a polygon drawn on paper.
Illustration] The pupil who cannot see the equality of vertical angles intuitively better than by the use of the protractor is abnormal.
Then run two perpendiculars from A and C by any of the methods already given,--sighting on a protractor or along the edge of a book if no better means are at hand.
A paperprotractor may be used for the same purpose.
If the protractoris so held that the plumb line cuts the semicircle at C, then AC is level because it is perpendicular to the vertical line BC.
A small brass protractorcan be bought for 15 cents, a good one, large size, costs 80 cents.
Then with a protractorlay off the degrees of the circle.
With theprotractor the lines AD and BD can be plotted on the plan.
With the protractor the angles at B and A may be drawn or plotted.
Thus for October 12th we may find with the protractorthat the angle between the line S V and the line joining the earth to Mars is a little more than 30°, and in Fig.
Rule another line along the same edge of the board as before and with a protractor measure the angle between these lines.
With a foot rule and a protractor measure a base line and the angles necessary to determine the length of the schoolroom.
A B C and showing that A B C = 85° as nearly as the protractor scale can be read.
Carry the protractor farther away from the window and repeat the experiment, to see how much the angle changes.
Measure with a protractor the angle between the two lines drawn in the map, and use this angle and the recorded times of the observation to find how many degrees per hour this direction is changing.
Morris of New York City made and sold his own invention of a "Nautical Protractor for the price of One Dollar.
He also made another protractor for attaching to the end of a ruler for measuring distances on charts.
Note posterior to the adductor and below the retractor a small impression which affords attachment for the protractor muscles of the foot.
Note the projecting muscular foot, the movements of which are governed by the retractor and protractor muscles attached to the impressions just mentioned.
Note two sets of these muscles, one set for thrusting the cardiac portion of the stomach out through the mouth and another for pulling it back, the protractor muscles and retractor muscles, respectively.
After having drawn the locking face Q M, we draw the angle of width of teeth of 4½°, by planting the protractor on the escape center B.
The pallet having 12° draw when locked we place the center of the protractor on this corner and draw the angle Q M E.
Lieutenant Back missing the protractor which he used for laying down his bearings on the map, Augustus set off in the rain early this forenoon to recover it from an Esquimaux woman, whom he had seen pick it up.
His journey had been lengthened by the Esquimaux having gone farther to the eastward than he had expected, but he had recovered the protractor which had been kept in their ignorance of its utility to us.
Projecting Protractor Readings A simple and efficient means of projecting protractor readings to a larger size is shown in Fig.
Then the points are spread to the radius desired, and the protractor is read where the elastic band crosses its scale.
Illustration: The Extension Marks can be Easily Read on the Protractorunder the Elastic Band (Fig.
One point of the compass is placed at the center of the protractor and an elastic band is looped between the points.
In connection with this plumb line we occasionally used a protractor consisting of a semicircle of cardboard 5 inches in diameter, on which the degrees of the circle were marked off with radiating lines, as illustrated in Fig.
Now we will place the base edge of our protractor on the base line with its center at the right hand end of the line.
In guns of the ordinary construction, the position of the vent is marked on the profile-board, and its inclination to the surface is determined by the protractor and vent-gauge.
Its inclination to the surface, and its position externally, are verified by means of the vent-guide furnished for the Dahlgren guns, and by the semicircular protractor and the vent-gauge.
A semicircular protractor of metal for measuring the inclination of vents, or for ascertaining their deviation from the guide.
He read the new azimuth, and the doctor laid off the two readings on a sheet of paper with a protractor and made a few calculations.
Carnes read the compass bearing on the protractor attached to the frame which supported the telescope.
The center of the protractor is the lookout point.
In order to determine in what section or quarter section a fire is located, each lookout point on the Supervisor's and Rangers' fire maps has a transparent circular protractor mounted on it.
As all angles are not obtainable by the square or bevel, a protractor is a most desirable addition to the stock of tools.
The protractor has a graduated disk, and is adjustable so it can be disposed at any angle.
I have also here another glass plate in which the lines diverge each at a very slightly different angle--a typewriting protractor for measuring the slant of divergence of various letters that have become twisted, so to speak.
Clare had been using the protractor herself, quickly familiarizing herself with it.
For measuring the slopes of letters a transparent protractor is necessary.
Off and on I try and keep up my Euclid and do a rider over my lunch, and I just keep a protractor handy.
But why in Heaven's name," Yaverland asked, "do you carry a protractor about with you?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "protractor" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: bevel; compass; gauge; protractor; quadrant; sextant; transit
