The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 12
... perches to the decimal of a mile . 1 mile 5 furlongs 8 40 8 fur . 40 200 vulgar fraction . 320 320 per . 320 ) 200.0 ( .625 decimal sought . 1920 800 640 1600 1600 Reduce 21 minutes 54 seconds to the decimal of a degree . Ans . .365 ...
... perches to the decimal of a mile . 1 mile 5 furlongs 8 40 8 fur . 40 200 vulgar fraction . 320 320 per . 320 ) 200.0 ( .625 decimal sought . 1920 800 640 1600 1600 Reduce 21 minutes 54 seconds to the decimal of a degree . Ans . .365 ...
Page 13
... perches 14.0000 [ in a rood . The value , therefore , is 1 rood 14 perches . What is the value of .6875 of a yard ? DECIMAL FRACTIONS . 13.
... perches 14.0000 [ in a rood . The value , therefore , is 1 rood 14 perches . What is the value of .6875 of a yard ? DECIMAL FRACTIONS . 13.
Page 103
... perches , or miles , & c . and this mark , either in an angle or on a side , denotes the angle or side to be required . From these proportions it may be observed ; that to find a side , when the angles and one side are given , any side ...
... perches , or miles , & c . and this mark , either in an angle or on a side , denotes the angle or side to be required . From these proportions it may be observed ; that to find a side , when the angles and one side are given , any side ...
Page 134
... perches , which consists of 100 links ; ( and this is the most natural division ) or by one of 50 links , which contains two poles or perches : but because the length of a perch differs in many places , therefore the length of chains ...
... perches , which consists of 100 links ; ( and this is the most natural division ) or by one of 50 links , which contains two poles or perches : but because the length of a perch differs in many places , therefore the length of chains ...
Page 139
... perch ; and because 320 perches make a mile , therefore 640 rotations wil be a mile also ; and the machinery is so contrived , that by means of a hand , which is carried round by the work , it points out the miles , quarters , and perches ...
... perch ; and because 320 perches make a mile , therefore 640 rotations wil be a mile also ; and the machinery is so contrived , that by means of a hand , which is carried round by the work , it points out the miles , quarters , and perches ...
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Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 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.
Page 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.