A Treatise of Practical Mathematics, Part 2W. & R. Chambers, 1842 |
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Page 15
... sides ; and the tedious pro- cess of measuring them all by the chain is thus dispensed with , unless the measuring of offsets or some other cause requires all the sides to be measured ; but circumstances will determine what is the best ...
... sides ; and the tedious pro- cess of measuring them all by the chain is thus dispensed with , unless the measuring of offsets or some other cause requires all the sides to be measured ; but circumstances will determine what is the best ...
Page 16
... sides but one , and all its angles except the two at the extremities of that side . From the data it will always be possible , by applying trigonometrical calculation , to find two sides and the con- tained angle of each of the ...
... sides but one , and all its angles except the two at the extremities of that side . From the data it will always be possible , by applying trigonometrical calculation , to find two sides and the con- tained angle of each of the ...
Page 18
... side of the frame are divided into equal parts , for the purpose of drawing on the paper lines parallel or perpendicular to the edges of the frame ; and the edges of the other side are divided into degrees corresponding to a central ...
... side of the frame are divided into equal parts , for the purpose of drawing on the paper lines parallel or perpendicular to the edges of the frame ; and the edges of the other side are divided into degrees corresponding to a central ...
Page 19
... sides of the field , can also be measured at the same time by placing the frame with that side uppermost which contains the angular divi- sions , and then the contents of the field can be calculated independently of the plan . 32 ...
... sides of the field , can also be measured at the same time by placing the frame with that side uppermost which contains the angular divi- sions , and then the contents of the field can be calculated independently of the plan . 32 ...
Page 22
... 2 acres 28 poles by a line parallel to its side . A 10 ac . 3 ro . 20 pls . = 1087500 links = 217500 ... a = 2 ac . 0 ro . 28 pls . aL 217500 Hence , / = × 1500 300 links 22 PRACTICAL MATHEMATICS . 223 Division of Land,
... 2 acres 28 poles by a line parallel to its side . A 10 ac . 3 ro . 20 pls . = 1087500 links = 217500 ... a = 2 ac . 0 ro . 28 pls . aL 217500 Hence , / = × 1500 300 links 22 PRACTICAL MATHEMATICS . 223 Division of Land,
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Common terms and phrases
actual range bastion body breadth bung diameter called cask centre constructed content in imperial cosec cosine course declination deflexion depth dial difference of latitude difference of longitude distance ditch divide divisor draw earth elevation equal EXAMPLE EXERCISES fathoms Find the content flank frustum gauge point glacis hence horizontal hypotenuse imperial bushels imperial gallons impetus inches inclination length logarithms longitude mean diameter measure meridian middle moon's multiply number of balls oblique observed opposite parallax parallel parapet perpendicular pile place of arms plane plane sailing pole potential range preceding primitive PROBLEM projectile projection proportional quadrant quotient radius ravelin redoubt refraction right angle right ascension sailing semi-diameter Severndroog Castle side sidereal sin² sine Sliding Rule small circle specific gravity spherical angle spherical excess spherical triangle spherical trigonometry square sun's surface true altitude ullage velocity vessel weight
Popular passages
Page 196 - Fig. 9. Case 1. Let AB, AC be each less than a quadrant. Let AE, AG be quadrants ; G will be the pole of AB, and E the pole of AC, and EC a quadrant; but, by prop. 12. CE is greater than CB, since CB is farther off from CGD than CE. In the same manner, it is shown...
Page 95 - To the square of the bung diameter add the square of the head diameter ; multiply the sum by the length, and the product again by .0014 for ale gallons, or by .0017 for wine gallons.
Page 96 - RULE. — To the square of the bung diameter add the square of the head diameter ; multiply the sum by the length, and the product by .0014 for ale gallons, or by .0017 for wine gallons.
Page 42 - A magnitude which has length, breadth, and thickness. Solution. The process by which the answer to a question is obtained. Specific gravity of a substance. The ratio of the weight of a given volume of it to that of an equal volume of water.
Page 192 - A sphere is a solid, bounded by one continued convex surface, every point of which is equally distant from a point within, called the centre. The sphere may be conceived to be formed by the revolution of a semicircle about its diameter, which remains fixed.
Page 227 - ZODIAC.— The Zodiac is an imaginary belt, or broad circle, extending quite around the heavens. The ecliptic divides the zodiac into two equal parts, the zodiac extending 8 degrees on each side of the ecliptic, and therefore is 16 degrees wide.
Page 196 - BC will be greater than a quadrant : for let AE be a quadrant, then E is the pole of AC, and EC will be a quadrant. But CB is greater than CE by Prop. 12.
Page 195 - Oj the same affection with the angles opposite to them, that is, if the sides be greater or less than quadrants, the opposite angles will be greater or less than right angles, and conversely.
Page 195 - IN a right angled spherical triangle, the sides are of the same affection with the opposite angles ; that is, if the sides be greater or less than quadrants, the opposite angles will be greater or less than right angles. Let ABC be a spherical triangle right angled at A, any side AB, will be of the same affection with the opposite angle ACB. Case 1.
Page 195 - ... will be greater than a quadrant. Let ABC be a right angled spherical triangle ; according as the two sides AB, AC are of the same or of different affection, the hypotenuse BC will be less, or greater than a quadrant. The...