Air Navigation For Flight Officers |
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Common terms and phrases
00m oos 1st Mag barometer bearing given body centre circle clouds Coefficient compass bearing compass card CONG CONGRES CONGRESS THE LIBRARY corrected Cumulus cyclonic daily difference deflected deviation Devn direction distance earth east and west equator Example Flashing flying ground geographical poles Greenwich Greenwich mean GRESS Hemisphere horizontal hour angle isobars latitude latitude and declination latter LIBR LIBRA LIBRARY OF CONGRESS light longitude longitudinal low pressure machine machine's compass machine's head magnetic bearing mean Mercator's chart mercury meridian passage miles moon Naut Nautical Almanac needle north and south Northern Hemisphere observer opposite names ordnance map parallel parallel ruler pole position quadrant rain RARY RESS shore compass shown soft iron star steer subtracted sun's superior meridian tables tion total force true bearing true course twelve hours Variation velocity vertical water vapour weather westerly wind
Popular passages
Page 117 - Time,' and is given in the Nautical Almanac for every two hours of the day throughout the year. In problems connected with the sun's bearing, the times given in the true bearing or azimuth tables are all apparent times, so that it is necessary to change the time by watch into apparent time. The Effect of Longitude. — The way in which the longitude of a place on the earth's surface affects the time of that place, should be clearly understood, as it helps to give one a firm grasp on the problems...
Page 90 - Generally, the softer the clouds look, the less wind (but perhaps more rain) may be expected ; and the harder, more ' greasy,' rolled, tufted, or ragged, the stronger the coming Wind will prove.
Page 89 - Whether clear or cloudy, a rosy sky at sunset presages fine weather ; a red sky in the morning bad weather, or much wind (perhaps rain) ; a grey sky in the morning, fine weather ; a high dawn, wind ; a low dawn, fair weather.
Page 84 - ... wavelets form on inland waters. Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty. Whole trees in motion; inconvenience felt when walking against wind. Breaks twigs off trees; generally impedes progress.
Page 90 - Small inky-looking clouds foretell rain ; light scud clouds driving across heavy masses show wind and rain, but, if alone, may indicate wind only. High upper clouds crossing the sun, moon, or stars in a direction different from that of the lower clouds, or the wind then felt below, foretell a change of wind.
Page 90 - Light, delicate, quiet tints or colours, with soft, undefined forms of clouds, indicate and accompany fine weather ; but gaudy or unusual hues, with hard, definitely outlined clouds, foretell rain, and probably, strong wind.
Page 91 - After fine clear weather, the first signs in the sky of a coming change are usually light streaks, curls, wisps, or mottled patches of white distant clouds, which increase and are followed by an overcasting of murky vapour that grows into cloudiness.
Page 89 - high dawn" is when the first indications of daylight are seen above a bank of clouds ; a " low dawn " Ы when the day breaks on or near the horizon, the first streaks of light being very low down.
Page 48 - The spot having been chosen, permanent lines are marked out running north, south, east, and west. The north-east, south-east, south-west, and north-west lines may also be drawn in if required. Permanent marks should be placed at the ends of these lines and also at the central spot. All that has to be done is to place the machine's head along the desired line and note the compass reading. The difference between this and the lubber point of the compass will be the deviation. An explanation of the methods...
Page 110 - A SPHERE is a solid, bounded by a surface, every point of which is equally distant from a fixed point called the centre. A radius of a sphere is a straight line joining the centre to any point in the surface.