Tables of Logarithms of Numbers and of Sines and Tangents for Every Ten Seconds of the Quadrant: With Other Useful Tables |
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Page 21
... perpendicular let fall from one extremity of the arc on the radius passing through the other extremity . Thus FG is the sine of the arc AF , or of the angle ACF . Every sine is half the chord of double the arc . Thus the sine FG is the ...
... perpendicular let fall from one extremity of the arc on the radius passing through the other extremity . Thus FG is the sine of the arc AF , or of the angle ACF . Every sine is half the chord of double the arc . Thus the sine FG is the ...
Page 32
... perpendicular EF . Then EF will be the sine , and CF the cosine of the angle C. Because the triangles CAB , CFE are similar , we have or Also , or CE : CB :: EF : BA , R CB sin . C : BA . : CE : CB :: CF : CA , R : CB cos . C : CA ...
... perpendicular EF . Then EF will be the sine , and CF the cosine of the angle C. Because the triangles CAB , CFE are similar , we have or Also , or CE : CB :: EF : BA , R CB sin . C : BA . : CE : CB :: CF : CA , R : CB cos . C : CA ...
Page 33
... perpendicular . The three sides will then be called the hypothenuse , base , and perpendicular . The base and perpendicular are sometimes called the legs of the triangle . Of the two acute angles , that which is adjacent to the base may ...
... perpendicular . The three sides will then be called the hypothenuse , base , and perpendicular . The base and perpendicular are sometimes called the legs of the triangle . Of the two acute angles , that which is adjacent to the base may ...
Page 34
... perpendicular 231.63 2.364798 . Also , Radius , 10.000000 Is to the hypothenuse 275 2.439333 As the cosine of C 57 ° 23 ' 9.731602 To the base 148.23 2.170935 . Ex . 2. Given the hypothenuse 67.43 , and the angle at the perpendicular 38 ...
... perpendicular 231.63 2.364798 . Also , Radius , 10.000000 Is to the hypothenuse 275 2.439333 As the cosine of C 57 ° 23 ' 9.731602 To the base 148.23 2.170935 . Ex . 2. Given the hypothenuse 67.43 , and the angle at the perpendicular 38 ...
Page 35
... perpendicular is given , perpendicular must be substituted for base in this proportion . Ex . 1. Given the base 222 , and the angle at the base 25 ° 15 ' , to find the perpendicular and hypothenuse . By natural numbers , we have 1 : 222 ...
... perpendicular is given , perpendicular must be substituted for base in this proportion . Ex . 1. Given the base 222 , and the angle at the base 25 ° 15 ' , to find the perpendicular and hypothenuse . By natural numbers , we have 1 : 222 ...
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Common terms and phrases
9 I I altitude angle of elevation arithm base chains circle Co-sine Co-tangent complement computed correction cosecant course and distance decimal diameter diff difference of latitude difference of longitude Dist divided equal equator fifth figure find the angles find the area find the Logarithm frustum given number given the angle height Hence horizontal plane hypothenuse inches latitude and departure length LO LO LO logarithmic sine measured meridian middle latitude miles minutes Multiply natural number nautical miles parallel parallel sailing perpendicular places plane sailing Prob Prop proportional quadrant radius Required the logarithmic right-angled spherical triangle right-angled triangle Sandy Hook secant ship sails side AC spherical triangle ABC SPHERICAL TRIGONOMETRY station subtract surface tabular number tang Tangent telescope theodolite Theorem vernier vertical Vulgar Fraction wyll yards zoids ΙΙ ΙΟ
Popular passages
Page 20 - The circumference of every circle is supposed to be divided into 360 equal parts, • called degrees, each degree into 60 minutes, and each minute into 60 seconds, etc.
Page 163 - In any spherical triangle, the sines of the sides are proportional to the sines of the opposite angles. In the case of right-angled spherical triangles, this proposition has already been demonstrated.
Page 69 - FIND the area of the sector having the same arc with the segment, by the last problem. Find also the area of the triangle, formed by the chord of the segment and the two radii of the sector.
Page 54 - 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 69 - TO THE NUMBER OF DEGREES IN THE ARC ; So IS THE AREA OF THE CIRCLE, TO THE AREA OF THE SECTOR.
Page 73 - To find the solidity of a pyramid. RULE. Multiply the area of the base by one third of the altitude.
Page vi - The characteristic of the logarithm of ANY NUMBER GREATER THAN UNITY, is one less than the number of integral figures in the given number.
Page 184 - If a heavy sphere, whose diameter is 4 inches, be let fall into a conical glass, full of water, whose diameter is 5, and altitude 6 inches ; it is required to determine how much water will run over ? AHS.