The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art. With a New Set of Accurate Mathematical TablesHarper, 1832 - 348 pages |
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Page 47
... glass at C , it is again reflected to E , where the eye likewise receives , through the transparent part of that glass , a direct ray from the boun- dary of the horizon . Hence , the triangle AEC has its exterior angle ECD and one of ...
... glass at C , it is again reflected to E , where the eye likewise receives , through the transparent part of that glass , a direct ray from the boun- dary of the horizon . Hence , the triangle AEC has its exterior angle ECD and one of ...
Page 48
... horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its most improved state , and ...
... horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its most improved state , and ...
Page 121
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid in a brass rim , to pre- vent the needle being disturbed by wind or rain at the time of surveying there is also a brass ...
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid in a brass rim , to pre- vent the needle being disturbed by wind or rain at the time of surveying there is also a brass ...
Page 131
... glass lid be taken off , and let the instrument be turned on one side , with the stem of the ball into the notch of the socket , so that the circle may be perpendicular to the plane of the horizon ; let the instrument be placed in this ...
... glass lid be taken off , and let the instrument be turned on one side , with the stem of the ball into the notch of the socket , so that the circle may be perpendicular to the plane of the horizon ; let the instrument be placed in this ...
Page 222
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be ... horizon- tal level of another , for various intentions , and of marking out courses for conveyance of water , & c ...
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be ... horizon- tal level of another , for various intentions , and of marking out courses for conveyance of water , & c ...
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Common terms and phrases
ABCD acres altitude arch azimuth base bearing blank line centre chains and links circle circumferentor co-sine column compasses contained cube root decimal diagonal diameter difference of latitude divided divisions divisor draw east ecliptic edge EXAMPLE feet field-book figure four-pole chains geometrical series given angle given number half the sum height Hence horizon glass hypothenuse inches instrument length logarithm manner measure meridian distance method multiplied needle nonius number of degrees object observed offsets opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal SCHOLIUM screw secant sect sector semicircle side square root station stationary distance subtract suppose survey taken tangent theo theodolite THEOREM third trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Popular passages
Page 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Page 49 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 163 - RULE. From half the sum of the three sides subtract each side severally.
Page 41 - 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, &c.
Page 97 - 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 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Page 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Page 24 - The square of the sum of two numbers is equal to the square of the first number plus twice the product of the first and second number plus the square of the second number.
Page 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.