## Hints to Travellers: Scientific and General, Volume 1 |

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accuracy accurately adjustment altitude aneroid angles apparent approximate azimuth barometer base bearing carried centre circle clamp compass computed correct Cosec Cosine Declination described determined Diff difference direction distance divided division draw drawn east equal equator error example feet fixed give given greater ground height horizontal hour inches intersection interval known latitude length less Logarithm longitude lower manner mark mean measured meridian method micrometer miles move necessary object observations obtained ordinary Parallax parallel passing plane table position possible probable rays reading represent scale screw Secant Cotang seconds sextant shown sides Sine staff star station survey taken Tangent telescope theodolite thermometer traveller traverse triangle true turn vernier vertical watch zero

### Popular passages

Page 83 - In all four languages a noun referring to the distance from the end of the thumb to the end of the middle finger...

Page 144 - 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.

Page 85 - 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...

Page 75 - 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)

Page 69 - 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.

Page 45 - To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig.

Page 44 - 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.

Page 26 - 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...

Page 205 - 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.

Page 473 - 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.