A Treatise of Practical Mathematics, Part 2W. & R. Chambers, 1842 |
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Page 152
... fathoms thick , and a rampart of 8 or 10 , besides their slopes . 245. The outside of the rampart is commonly lined with a wall of stone called the revêtement , which is strengthened within by buttresses , called counterforts . 246 ...
... fathoms thick , and a rampart of 8 or 10 , besides their slopes . 245. The outside of the rampart is commonly lined with a wall of stone called the revêtement , which is strengthened within by buttresses , called counterforts . 246 ...
Page 153
... Fathoms 45 2 20 Fathoms Ditch 12 17 를 3 18 30 Glacis Way Covert 11 18 14 12 11 33 Parapet Banquette Rampart In this profile the dimensions are all given in feet FORTIFICATION . 153 Profile of the Principal Works,
... Fathoms 45 2 20 Fathoms Ditch 12 17 를 3 18 30 Glacis Way Covert 11 18 14 12 11 33 Parapet Banquette Rampart In this profile the dimensions are all given in feet FORTIFICATION . 153 Profile of the Principal Works,
Page 154
... fathoms , 253. The dotted line LV represents the natural level of the ground , or plane of site , the bottom of the ditch being 12 feet below it , and the top of the parapet 18 feet above it , and that of the rampart 12 feet . The inner ...
... fathoms , 253. The dotted line LV represents the natural level of the ground , or plane of site , the bottom of the ditch being 12 feet below it , and the top of the parapet 18 feet above it , and that of the rampart 12 feet . The inner ...
Page 155
... fathoms , CD = 30 , AE = A'E ' = 50 , EF EE ' , and E'F = EE ' . = Breadth of ditch , ... ... ... AN 20 fathoms , ... Covert way , QR = 6 glacis , RS - 20 parapet , mo = 3 rampart , mn = 8 ... ... Sometimes a fine line is made within ...
... fathoms , CD = 30 , AE = A'E ' = 50 , EF EE ' , and E'F = EE ' . = Breadth of ditch , ... ... ... AN 20 fathoms , ... Covert way , QR = 6 glacis , RS - 20 parapet , mo = 3 rampart , mn = 8 ... ... Sometimes a fine line is made within ...
Page 156
... fathoms broad . 257. Forts are generally square fortifications , the exterior side being between 80 and 130 fathoms , the perpendicular being only about of the exterior side , otherwise the gorges of its bastions would be too narrow ...
... fathoms broad . 257. Forts are generally square fortifications , the exterior side being between 80 and 130 fathoms , the perpendicular being only about of the exterior side , otherwise the gorges of its bastions would be too narrow ...
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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...