Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |
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Page 67
... telescope MN . This telescope is connected with a hollow cylinder , which is worked freely round the outer spindle , by the thumb - screw P , having a pinion working into a concealed cog - wheel , that is perma- nently fastened to the ...
... telescope MN . This telescope is connected with a hollow cylinder , which is worked freely round the outer spindle , by the thumb - screw P , having a pinion working into a concealed cog - wheel , that is perma- nently fastened to the ...
Page 68
... telescope are called the wyes , and designated Y's . Two loops , turning on hinges , pass over the telescope , and are made fast by the pins c and d ; these loops confine the telescope in the Y's . By withdrawing the pins , and turning ...
... telescope are called the wyes , and designated Y's . Two loops , turning on hinges , pass over the telescope , and are made fast by the pins c and d ; these loops confine the telescope in the Y's . By withdrawing the pins , and turning ...
Page 69
... telescope , which is called the line of collimation . Having screwed the tripod to the instrument , extend the legs , and place them firmly . Then loosen the clamp - screw S , of the vernier plate , and direct the telescope to a small ...
... telescope , which is called the line of collimation . Having screwed the tripod to the instrument , extend the legs , and place them firmly . Then loosen the clamp - screw S , of the vernier plate , and direct the telescope to a small ...
Page 70
... telescope , parallel to the line of collimation . Turn the vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against ...
... telescope , parallel to the line of collimation . Turn the vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against ...
Page 71
... telescope , when the telescope is reversed , the bubble would not stand in the middle of the tube , except in one position of the level . This suggests the necessity of making the first part of the adjustment with tolerable accuracy ...
... telescope , when the telescope is reversed , the bubble would not stand in the middle of the tube , except in one position of the level . This suggests the necessity of making the first part of the adjustment with tolerable accuracy ...
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Common terms and phrases
Applying logarithms axis azimuth back-sight base-line bearing chord clamp-screw column compass contour lines corresponding Cosine Cosine D Cotang course curve decimal degree of curvature degrees determined difference of level divided double meridian distance draw drawn east error example feet field-notes fore-sight given angle given line given point ground height of instrument hence horizontal angles horizontal distance horizontal plane inch intersection latitude and departure length limb line of collimation M.
M. Sine mantissa marked measured method multiplied notes offsets paper parallel passing perpendicular plane of reference plot position prismoid protractor radius reading right angles scale of equal screws secant side sights Sine D slope spider's lines stakes station subtract surface survey taken Tang tangent theodolite traverse vernier plate vertical plane wwwwwwwww yards
Popular passages
Page 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Page 17 - 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.
Page 37 - 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, etc.
Page 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Page 10 - When a number lies between 1 and 10, its logarithm lies between 0 and 1; that is, it is equal to 0, plus a decimal; if a number lies between 10...
Page 9 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Page 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Page 130 - MC; hence, the double meridian distance of a course is equal to the double meridian distance of the preceding course, plus the departure of that course, plus the departure of the course itself : if .there is no preceding course, the first two terms become zero.
Page 38 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, 00 is the secant of the arc AB.