Hints to Travellers: Scientific and General, Volum 1Royal geographical society, 1906 |
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Hints to Travellers: Scientific and General, Volum 1 Royal Geographical Society (Great Britain) Uten tilgangsbegrensning - 1906 |
Hints to Travellers: Scientific and General, Volum 1 Royal Geographical Society (Great Britain) Uten tilgangsbegrensning - 1906 |
Vanlige uttrykk og setninger
accuracy accurately adjustment alidade aneroid approximate artificial horizon astronomical azimuth barometer bearing celestial centre chronometer circle clamp computed Corr correct Cosine Parts Secant decl Declination diagram Diff difference of longitude equator Error of Watch Fahr fixed points geographical given hour angle inches Index Error intersection interval Length in feet Log sec log sine Logarithm longitude magnetic magnetic bearing mean measured mercury meridian method Mètres Feet micrometer moon Nautical Almanac object observations obtained occultation ordinary Parallax parallel plane table plane-table plate position prismatic compass probable error rays reading refraction Right Ascension screw Secant Cotang Secant Parts Cosine sextant shown sidereal Sine Parts Cosec star station Statute Miles subtended subtract survey surveyor TABLE XXXVII.-(continued tacheometer taken Tangent Cosec Tangent Parts Cotang tangent-screw telescope temperature theodolite thermometer transit theodolite traveller traverse triangle vernier vertical angles wires zero ΙΟ
Populære avsnitt
Side 81 - In all four languages a noun referring to the distance from the end of the thumb to the end of the middle finger...
Side 142 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Side 83 - Sound at intervals from shore to shore, fixing your position on each occasion, by a sextant-angle between your starting-place and your assistant's station, and throw the floats overboard, signalling to your assistant when you do so, that he may note the interval that elapses before they severally arrive opposite to him. Take an angle from the opposite shore, to give the breadth of the river. To make the calculation approximately, protract the section of the river on a paper ruled to scale in square...
Side 73 - The logarithm of the quotient of two positive numbers is found by subtracting the logarithm of the divisor from the logarithm of the dividend. (6) The logarithm of a power of a positive number is found by multiplying the logarithm of the number by the exponent of the power. For, N" = (oT)
Side 67 - E from the top until within a short distance of the water, which it should never touch, and is supported in that position by an indiarubber washer F. The steam passes from the boiler up the tube E and escapes by the hole G.
Side 43 - To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig.
Side 42 - The angle between the first and last directions of a ray which has suffered two reflections in one plane is equal to twice the inclination of the reflecting surfaces to each other. Let AB be the limb or graduated . arc, of a portion of a circle 60° in extent, but divided into 120 equal parts. On the radius CB let a silvered plane glass D be fixed, at right angles to the plane of the circle, and on the moveable radius CE let another such silvered glass, C, be fixed.
Side 24 - Also a large light box suffers much less from an accidental concussion than a small and heavy one. Thermometers travel best when slipped into india-rubber tubes. A coil of such tubing will serve as a floor, to protect a case of delicate instruments from the effects of a jar. Horse-hair is of use to replace old packing, but it has first to be prepared by steeping in boiling water, twisting into a rope, and, after it is firmly set, chopping it into short pieces. The hairs retain their curvature and...
Side 203 - For the same body the semidiameter varies with the distance; thus, the difference of the sun's semidiameter at different times of the year is due to the change of the earth's distance from the sun; and similarly for the moon and the planets.
Side 471 - Fellows of 20 years' standing and over £12 10«. 15 „ „ and under 20 ... £16 10 „ „ „ 15 ... £20 " And no Fellow shall be entitled to vote or to enjoy any other privilege of the " Society so long as he shall continue in arrear.