The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art. With a New Set of Accurate Mathematical TablesA. S. Barnes, 1839 - 412 páginas |
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Página 29
... centre is C , vertex F , and interposed square CAFE = 1 . In CA take AB and Ab , on each side , or 0.1 · and , erecting the perpendiculars BD , bd , half the sum of the spaces AD and Ad will be 0.1+ & c . and the half diff . = 0.01 ...
... centre is C , vertex F , and interposed square CAFE = 1 . In CA take AB and Ab , on each side , or 0.1 · and , erecting the perpendiculars BD , bd , half the sum of the spaces AD and Ad will be 0.1+ & c . and the half diff . = 0.01 ...
Página 41
... centre . 14. The describing line CB , fig . 8 , is called the semidiam- eter or radius ; so is any line from the centre to the circum- ference ; whence all radii of the same or of equal circles are equal . 15. The diameter of a circle ...
... centre . 14. The describing line CB , fig . 8 , is called the semidiam- eter or radius ; so is any line from the centre to the circum- ference ; whence all radii of the same or of equal circles are equal . 15. The diameter of a circle ...
Página 42
... centre , and so become the radius ; hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8 ) must be perpendicular to the diameter ( by def . 20 ) ...
... centre , and so become the radius ; hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8 ) must be perpendicular to the diameter ( by def . 20 ) ...
Página 45
... centre and with any radius the circum- ference of a circle may be described . 4. It is also required that the equality of lines and angles to others given , be granted as possible : that it is possible for one right line to be ...
... centre and with any radius the circum- ference of a circle may be described . 4. It is also required that the equality of lines and angles to others given , be granted as possible : that it is possible for one right line to be ...
Página 49
... centre of a circle ABED is double the angle BAD at the circumference , standing upon the same arc BED . Through the point A , and the centre C , draw the line ACE ; then the angle ECD = CAD + CDA ( by theo . 4 ) ; but since AC = CD ...
... centre of a circle ABED is double the angle BAD at the circumference , standing upon the same arc BED . Through the point A , and the centre C , draw the line ACE ; then the angle ECD = CAD + CDA ( by theo . 4 ) ; but since AC = CD ...
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Términos y frases comunes
ABCD acres altitude arch base bearing blank line centre chains and links circle circumferentor column compasses contained Cosine Sine cube root decimal diagonal diameter difference of latitude divided divisions divisor draw east ecliptic edge EXAMPLE feet field-book figure four-pole chains geometrical series given angle given number half the sum height Hence horizon glass hypothenuse inches instrument length logarithm manner measure meridian distance multiplied needle nonius number of degrees object observed opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal screw secant sect sector semicircle side Sine Cotang square root station stationary distance subtract suppose survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Pasajes populares
Página 49 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Página 41 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Página 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Página 45 - A lemma is something which is premised, or demonstrated, in order to render what follows more easy. A corollary is a consequent truth derived immediately from some preceding truth or demonstration.
Página 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Página 21 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.