Elements of Surveying, and Navigation: With a Description of the Instruments and the Necessary Tables |
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Page 9
... marked 0 , 1 , 2 , 3 , 4 , 5 , & c . , until you come to the column which is designated by the fourth figure of the ... marked 0 , are to be prefixed . If the four figures thus found , stand opposite to a row of six figures in the column ...
... marked 0 , 1 , 2 , 3 , 4 , 5 , & c . , until you come to the column which is designated by the fourth figure of the ... marked 0 , are to be prefixed . If the four figures thus found , stand opposite to a row of six figures in the column ...
Page 10
... marked D , the number on the same horizontal line with the logarithm , and multiply this number by the figures that have been considered as ciphers then cut off from the right hand as many places for decimals as there are figures in the ...
... marked D , the number on the same horizontal line with the logarithm , and multiply this number by the figures that have been considered as ciphers then cut off from the right hand as many places for decimals as there are figures in the ...
Page 24
... marked , 1 , 2 , 3 , & c . The unit of scales of equal parts , is , in general , either an inch , or an exact part of an inch . If , for example , ab the unit of the scale , were half an inch , the scale would be one of 10 parts to half ...
... marked , 1 , 2 , 3 , & c . The unit of scales of equal parts , is , in general , either an inch , or an exact part of an inch . If , for example , ab the unit of the scale , were half an inch , the scale would be one of 10 parts to half ...
Page 26
... marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical instruments , and is marked CHO . To lay off , at a given point of a line , with the ...
... marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical instruments , and is marked CHO . To lay off , at a given point of a line , with the ...
Page 27
... marked and the angular point : this line will make with the given line the required angle . SECTORAL SCALE OF EQUAL PARTS . 40 50 60 100 110 120 130 140 150 160 170 180 190 a 20 30 40 50 60 το 90 100 110 120 130 140 150 160 170 180 190 ...
... marked and the angular point : this line will make with the given line the required angle . SECTORAL SCALE OF EQUAL PARTS . 40 50 60 100 110 120 130 140 150 160 170 180 190 a 20 30 40 50 60 το 90 100 110 120 130 140 150 160 170 180 190 ...
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Elements of Surveying, and Navigation: With a Description of the Instruments ... Charles Davies No preview available - 2016 |
Elements of Surveying, and Navigation: With a Description of the Instruments ... Charles Davies No preview available - 2016 |
Popular passages
Page 12 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Page 49 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 41 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 34 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.
Page 73 - Being on a horizontal plane, and wanting to ascertain the height of a tower, standing on the top of an inaccessible hill, there were measured, the angle of elevation of the top of the hill 40°, and of the top of the tower 51° ; then measuring in a direct line 180 feet farther from the hill, the angle of elevation of the top of the tower Cway 33° 45' ; required the height of the tower.
Page 40 - THEOREM I. The sides of a plane triangle are proportional to the sines of their opposite angles.
Page 19 - A right-angled triangle is one which has a right angle. The side opposite the right angle is called the hypothenuse.
Page 85 - What must be the nominal value of 4% bonds that will yield to their owner an annual income of $720 ? 7. A owns $6000 of 5% bonds; B owns $8000 of 4£% bonds. How much greater is the annual income from B's bonds than from A's ? 8. Find the area of a piece of land in the form of a rhomboid, whose base is 32 rods and whose altitude is 15 rods.
Page 35 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, OC is the secant of the arc AB.
Page 130 - Take a board, of about one foot square, paste white paper upon it, and perforate it through the center; the diameter of the hole being somewhat larger than the diameter of the telescope of the theodolite. Let this board be so fixed to a vertical staff" as to slide up and down freely ; and let a small piece of board, about three inches square, be nailed to the lower edge of it, for the purpose of holding a candle. About twenty-five minutes before the time of the greatest eastern or western elongation...