A Treatise of Practical Surveying: Which is Demonstrated from Its First Principles. Wherein Every Thing that is Useful and Curious in that Art, is Fully Considered and Explained ... The Whole Illustrated with CopperplatesP. Wogan, 1795 - 319 páginas |
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Página 6
... those in the Dividend , and the Defect fupplied by prefixing Cyphers to the Quotient . For the Dividend is a Product contained under the Divifor and Quotient ; and that Product contains as many Places of Decimals as the Numbers do from ...
... those in the Dividend , and the Defect fupplied by prefixing Cyphers to the Quotient . For the Dividend is a Product contained under the Divifor and Quotient ; and that Product contains as many Places of Decimals as the Numbers do from ...
Página 16
... those Angles are called right Angles , and the Line CD a Perpen- dicular . 12. An obtufe Angle is that which is wider or greater than a right one , as the Angle ADE , Fig . 7. and an acute Angle is lefs than a right one , as ÉDB . Fig ...
... those Angles are called right Angles , and the Line CD a Perpen- dicular . 12. An obtufe Angle is that which is wider or greater than a right one , as the Angle ADE , Fig . 7. and an acute Angle is lefs than a right one , as ÉDB . Fig ...
Página 34
... . D. THE 7 H E 0. XII . If two equal and parallel Lines AB , CD , be joined by two other Lines AD , BC , those shall be also equal and parallel . Fig . 3 . Let Plate I. Let the Diameter or Diagonal BD be drawn 34 GEOMETRICAL.
... . D. THE 7 H E 0. XII . If two equal and parallel Lines AB , CD , be joined by two other Lines AD , BC , those shall be also equal and parallel . Fig . 3 . Let Plate I. Let the Diameter or Diagonal BD be drawn 34 GEOMETRICAL.
Página 43
... those in the other . By Theo . 22. ABC : abc :: the Square of AC to the Square of ac , and alfo ADC : adc :: the Square of AC , to the Square of ac ; therefore from Equa- lity of Proportions ABC : abc :: ADC : adc ; in like Manner we ...
... those in the other . By Theo . 22. ABC : abc :: the Square of AC to the Square of ac , and alfo ADC : adc :: the Square of AC , to the Square of ac ; therefore from Equa- lity of Proportions ABC : abc :: ADC : adc ; in like Manner we ...
Página 46
... those Arcs draw BO , and OL , and BOL is the Trian- gle required . This is manifeft from the Construction . PRO B. II . At a Point B in a given Right Line BC , to make an Angle equal to a given Angle A. Fig . 8 . = = Draw any right Line ...
... those Arcs draw BO , and OL , and BOL is the Trian- gle required . This is manifeft from the Construction . PRO B. II . At a Point B in a given Right Line BC , to make an Angle equal to a given Angle A. Fig . 8 . = = Draw any right Line ...
Términos y frases comunes
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Pasajes populares
Página 13 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees; and each degree into 60 minutes, each minute into 60 seconds, and so on.
Página 88 - 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.
Página 56 - ... logarithm of that number. EXAMPLE. • Required, the logarithm of 365. Answer, 2.56229. And though most tables of logarithms run but to 10000, yet by them the log. of any number not exceeding 10,000,000 may be found, and on the contrary, the number to any such logarithm, thus : 1 Find the log. of the first four figures of the given number 2. Take that log. from the log: of the number next following, and note their difference, 3. Multiply that difference by the remaining figures of the given number...
Página 91 - In the triangle ABC, there is given AB 240, the angle A 46° 30', and BC 200, to find the angle C, being acute, the angle B, and the side AC.
Página 89 - ED. that is as the sum of the two sides AB and BC, is to their difference ; so is the tangent of half the sum of the two unknown angles A and C, to the tangent of half their difference.
Página 32 - KCML, the sum of the two parallelograms or square BCMH ; therefore the sum of the squares on AB and AC is equal to the square on BC.
Página 19 - Four quantities are said to be in proportion when the product of the extremes is equal to that of the means, thus if A multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D. POSTULATES OR PETITIONS. 1 . That a right line may be drawn from any one given point to another. 2. That a right line may be produced or continued at pleasure. 3. That from any centre and with any radius, the circumference of a circle may be described.
Página 13 - A chord is a right line drawn from one end of an arc or arch (that is, any part of the circumference of a circle) to the other ; and is the measure of the arc. Thus the right line HG, is the measure of the arc HBG.
Página 72 - ... these three proportions, for DE we put its equal be, for AE put ab, and for AD put ac, they will become AB : ab : : AC : ас, and AB : ab : : BC : be, and AC : ac : : BC : be.
Página 285 - Then if the true and magnetic amplitudes, be both north or both south, their difference is the variation ; but if one be north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking...