A Course of Mathematics: For the Use of Academies as Well as Private Tuition : in Two Volumes, Volume 2W. E. Dean, 1831 - Mathematics |
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Page 35
... angles of any spheric polygon , is always less than 2n right angles , but greater than ( 2n - 4 ) right angles , n denoting the num ber of angles of the polygon . GENERAL SCHOLIUM . On the Nature and Measure of Solid Angles . A Solid angle ...
... angles of any spheric polygon , is always less than 2n right angles , but greater than ( 2n - 4 ) right angles , n denoting the num ber of angles of the polygon . GENERAL SCHOLIUM . On the Nature and Measure of Solid Angles . A Solid angle ...
Page 36
... solid angle made by the planes at their common point of meeting for no change can be conceived in the relative position of those planes , that is , in the magni- tude of the solid angle , without a corresponding and propor tional ...
... solid angle made by the planes at their common point of meeting for no change can be conceived in the relative position of those planes , that is , in the magni- tude of the solid angle , without a corresponding and propor tional ...
Page 37
... solid angles formed by n bounding planes , by the excess of the sum of the angles of inclination of the several ... angle of 180 ° . The maximum limit of solid angles is measured by the surface of a hemisphere , in like manner as the ...
... solid angles formed by n bounding planes , by the excess of the sum of the angles of inclination of the several ... angle of 180 ° . The maximum limit of solid angles is measured by the surface of a hemisphere , in like manner as the ...
Page 38
... solid angle of a regu . lar prism , with triangular base , is half each solid angle of a prism with a regular hexagonal base . Each with regular square base of each , with regular octagonal base , pentagonal ; hexagonal - = Im gonal = m ...
... solid angle of a regu . lar prism , with triangular base , is half each solid angle of a prism with a regular hexagonal base . Each with regular square base of each , with regular octagonal base , pentagonal ; hexagonal - = Im gonal = m ...
Page 39
... solid angles at the vertices of cones , will be deter . mined by means of the spheric segments cut off at the bases of those cones ; that is , it right cones , instead of having ... solid angle at the vertex of SPHERICAL TRIGONOMETRY . 39.
... solid angles at the vertices of cones , will be deter . mined by means of the spheric segments cut off at the bases of those cones ; that is , it right cones , instead of having ... solid angle at the vertex of SPHERICAL TRIGONOMETRY . 39.
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Common terms and phrases
absciss altitude axis ball base beam becomes body centre of gravity circle conic surface consequently Corol cosine curve cylinder denote density descending determine diameter direction distance draw earth equa equal equation equilibrio EXAM expression feet find the fluent fluid force given plane ground line Hence horizontal plane hyperbola inches inclined plane intersection length logarithm measure motion moving multiplied nearly ordinate parabola parallel pendulum perpendicular position pressure prob PROBLEM PROP proportional quantity radius ratio rectangle resistance right angles right line roots Scholium side sine solid angle space specific gravity spherical excess spherical triangle square straight line supposed surface tangent theorem theref tion variable velocity vertex vertical plane vertical projections vibrations weight whole
Popular passages
Page 13 - 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 469 - Or, by art. 249 of the same, the pressure is equal to the weight of a column of the fluid...
Page 74 - To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig.
Page 299 - The workmen thought that substituting part silver was only a proper <perquisite; which taking air, Archimedes was appointed to examine it ; who, on putting...
Page 158 - MECHANICAL POWERS are certain simple instruments employed in raising greater weights, or overcoming greater resistance than could be effected by the direct application of natural strength. They are usually accounted six in number; viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 249 - BPC) ; or, the pressure of a fluid on any surface is equal to the weight of a column of the fluid...
Page 301 - In the doctrine of fluxions, magnitudes or quantities of all kinds are considered as not made up of a number of small parts, but as generated by continued motion, by means of which they increase or decrease ; as a line by the motion of a point ; a surface by the motion of a line ; and a solid by the motion of a surface.
Page 254 - Weigh the denser body and the compound mass, separately, both in water, and out of it ; then find how much each loses in water, by subtracting its weight in water from its weight in air; and subtract the less of these remainders from the greater. Then...
Page 494 - The reason is, all bodies lose some of their weight in a fluid, and the weight which a body loses in a fluid, is to its whole weight, as the specific gravity of the fluid is to that of the body.
Page 461 - ... horizontal *. 2. The theorems just given may serve to show, in what points of view machines ought to be considered by those who would labour beneficially for their improvement. The first object of the utility of machines consists in furnishing the means of giving to the moving force the most commodious direction ; and, when it can be done, of causing its action to be applied immediately to the body to be moved. These can rarely be united : but the former can be accomplished in most instances...