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 sider |
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Resultat 6-10 av 39
Side 153
... North of the Box to your Eye , and count your Degrees to the North Point of the Needle ; or you may turn the South of the Box to your Eye , and count your Degrees to the South End of the Needle . The Brafs Ring in the Box is divided on ...
... North of the Box to your Eye , and count your Degrees to the North Point of the Needle ; or you may turn the South of the Box to your Eye , and count your Degrees to the South End of the Needle . The Brafs Ring in the Box is divided on ...
Side 154
... North or South , as before , thus : If the Point of your Needle lies between the North and Eaft , North and Weft , South and Eaft , or South and Weft Points in the Bottom of the Box , then put down NE , NW , SE , or SW , annexing there ...
... North or South , as before , thus : If the Point of your Needle lies between the North and Eaft , North and Weft , South and Eaft , or South and Weft Points in the Bottom of the Box , then put down NE , NW , SE , or SW , annexing there ...
Side 157
... North ; confequent- ly the North must be a like Number of Degrees from the Line , and thus the North , and of course the South , as well as the Eaft and Weft , or the Si- tuation of the Land , is obtained . Secondly , To take the ...
... North ; confequent- ly the North must be a like Number of Degrees from the Line , and thus the North , and of course the South , as well as the Eaft and Weft , or the Si- tuation of the Land , is obtained . Secondly , To take the ...
Side 158
... North , and South , abftracted of the Varia- tion . The Circumferentor Box may be then taken off . Direct the Sights to the Object at the fecond Station , and the Degree cut by the oppofite End of the Index will be the Bearing of that ...
... North , and South , abftracted of the Varia- tion . The Circumferentor Box may be then taken off . Direct the Sights to the Object at the fecond Station , and the Degree cut by the oppofite End of the Index will be the Bearing of that ...
Side 159
... North End , or Flower - de - Luce , next your Eye , and count the Degree to the oppofite , or South End of the Index , and this will correspond with the Degree cut by the South End of the Needle . At the Second , or next Station ...
... North End , or Flower - de - Luce , next your Eye , and count the Degree to the oppofite , or South End of the Index , and this will correspond with the Degree cut by the South End of the Needle . At the Second , or next Station ...
Vanlige uttrykk og setninger
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Populære avsnitt
Side 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.
Side 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.
Side 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...
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 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...