A complete treatise on practical land-surveying, in seven parts; . to memory. KULK. T :he sum of the first and last ordinates, add four tin:sum of all -rdinates, and twice the sum of all the odd ordinates, not including the first and last^ multiply th: r commoi of the ordinates, divide the product by 3, and the quotient will be the area required. Note.—The length of the base must be ascertained before yon begin totake the ordinates, in order that yon may divide it into an even number ofequal parts; or you may take the dimensions without doing this, and find :.1t ire; :: : r jir: — :: :he e:
A complete treatise on practical land-surveying, in seven parts; . to memory. KULK. T :he sum of the first and last ordinates, add four tin:sum of all -rdinates, and twice the sum of all the odd ordinates, not including the first and last^ multiply th: r commoi of the ordinates, divide the product by 3, and the quotient will be the area required. Note.—The length of the base must be ascertained before yon begin totake the ordinates, in order that yon may divide it into an even number ofequal parts; or you may take the dimensions without doing this, and find :.1t ire; :: : r jir: — :: :he e:.i. :; ...i rulr: ::r :r: „:.£ rr-^Tri:::~.which being added to that part of the figure computed by equidistant ordi-nates, will give the whole area. See the following example. 1. Required the plan and area of a piece of land, measuredby equidistant ordinate?, from the following notes. Part III.) LAND-SURVEYING, 99 Besfin AB 1167 0 1100 44 EF 1000 97 CD 900 139 800 175 700 206 600 230 500 248 400 260 300 264 200 268 100 262 000 252 at A, and go West. E C The first and last ordinates. 252 The first ordinate A The last ordinate C Sum. The even ordinates. 262 Tenth. TTl9 4476 Four times the sum. h 2 100 land-surveying. (Part III. The odd ordinates, 268 Seventh. 175 Sum. 1866 Twice the sum. 349 The first and last ordinatef>4476 Four times the sum, & Twice the sum, &c. 6691 Sum total. 100 The common distance. 3)669 100 223033 The area of the figure A C D G. frapezo id C E F D. Triangle EBF 97 67 44 44 141 268 100 268 14100 2948 Double Trapezoid CE F D2948 Triangle EBF. 2)17048 Sum. 8524 The area of the figure Ditto of the figure Sum. 4 10 49120 Hence the area of the ^hole figure A C E B F D G A, i*2a. Ir. IO^p. nearly. Part III.) LAND-SURVEYING. 101 2. Lay down a piece of ground, and find its area from thefollowing equidistant
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