Hva folk mener - Skriv en omtale
Vi har ikke funnet noen omtaler på noen av de vanlige stedene.
Andre utgaver - Vis alle
Elements of Surveying: With the Necessary Tables - Primary Source Edition
Ingen forhåndsvisning tilgjengelig - 2013
acres adjustment apparent level ascertain axis back-sights base line bearing centre clamp screw coincide column compass corresponding cosec Cosine Cotang curve decimal degrees determined difference of level direction divided east elongation Example extremity feet figure ground Gunter's chain hence hori horizontal angles horizontal distance horizontal plane inches instrument intersection latitude and departure levelling screws line fg line of collimation loga marked measure multiplied needle number answering object paper parallel perpendicular plain table plane of reference plane triangle position protractor Quadrilateral quotient radius right angles rithm roods scale of equal secant sector side sights similar triangles slide spider's lines square chains square rods staff station subtracted surface survey Tang tangent theodolite thumb screw trapezoids trigonometry true meridian upper telescope vernier plate vertical limb whole numbers zontal
Side 19 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Side 61 - 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.
Side 29 - In any triangle, the sum of the two sides containing either angle, is to their difference, as the tangent of half the sum of the two other angles, to the tangent of half their difference.
Side 21 - NB The minutes in the left-hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right-hand column, belong to the degrees below.
Side 106 - The line so determined makes, with the true meridian, an angle equal to the azimuth of the pole star; and from this line the variation of the needle is readily determined, even without tracing the true meridian on the ground. Place the compass upon this line, turn the sights in the direction of It, and note the angle shown by the needle. Now, if the elongation at the time of observation...
Side 25 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, each degree into 60 equal parts called minutes, each minute into 60 equal parts called seconds.
Side 16 - ... from the right hand as many places for decimals as there are figures in the multiplier, and add the product, so obtained, to the first logarithm, for the logarithm sought.
Side 14 - The logarithm of any root of a number, is equal to the logarithm of that number divided by the index of the root.
Side 101 - But the star being at a distance from the pole equal to 1° 30' nearly. It performs a revolution about the pole in a circle, the polar distance of which is 1° 30': the time of revolution is 23 h. and 56 min. To the eye of an observer this star is continually in motion, and is due north but twice in 23 h. 56 min.; and is then said to be on the meridian. Now, when It departs from the meridian it apparently moves east or west for 5 h.