The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 σελίδες |
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Αποτελέσματα 1 - 5 από τα 89.
Σελίδα 49
... triangle ABC , one of its legs , as BC , being produc- ed towards D , it will make the external angle ACD equal to the two internal opposite angles taken together . Viz . to B and A. Through C , let CE be drawn parallel to AB ; then ...
... triangle ABC , one of its legs , as BC , being produc- ed towards D , it will make the external angle ACD equal to the two internal opposite angles taken together . Viz . to B and A. Through C , let CE be drawn parallel to AB ; then ...
Σελίδα 50
... triangle ABC ' be supposed to be laid on the triangle DEF , so as to make the points A and B coincide with D and E , which they will do , because AB DE ( by the hypothesis ) ; and since the angle A = D , the line AC will fall along DF ...
... triangle ABC ' be supposed to be laid on the triangle DEF , so as to make the points A and B coincide with D and E , which they will do , because AB DE ( by the hypothesis ) ; and since the angle A = D , the line AC will fall along DF ...
Σελίδα 51
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. triangles a cd , dc b , by making the angle a c d = dcb ( by postulate 4 ) then because a c = b c , and cd common , ( by the last ) the triangle ...
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. triangles a cd , dc b , by making the angle a c d = dcb ( by postulate 4 ) then because a c = b c , and cd common , ( by the last ) the triangle ...
Σελίδα 52
... triangles ADC , BDC are right angled ones , since the line CD is a perpendicular ; and so the angle ACD = DCB ; ( by cor . 2. theo . 5. ) then have we AC , CD , and the angle ACD in one tri- angle ; severally equal to CB , CD , and the ...
... triangles ADC , BDC are right angled ones , since the line CD is a perpendicular ; and so the angle ACD = DCB ; ( by cor . 2. theo . 5. ) then have we AC , CD , and the angle ACD in one tri- angle ; severally equal to CB , CD , and the ...
Σελίδα 53
... triangles ADF , BDF ; AD = BD ( by the last ; ) DF is common , and the angle ADF BDF being both right , for CD or DF is ... triangle ABD , the half of each side is the sine of the opposite angle . Let the circle ADB be drawn through the ...
... triangles ADF , BDF ; AD = BD ( by the last ; ) DF is common , and the angle ADF BDF being both right , for CD or DF is ... triangle ABD , the half of each side is the sine of the opposite angle . Let the circle ADB be drawn through the ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 38 - 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.
Σελίδα 25 - 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.
Σελίδα 197 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 106 - 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.
Σελίδα 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.