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actinometer amount of rain anemometer aqueous vapour atmosphere axis barometer boiling-point bulb Centigrade cistern climate clouds column construction correction cubic foot curve cylinder deduced degree of humidity density determined dew-point diameter direction diurnal dry air dry-bulb thermometer earth elastic force electricity equal ether evaporation expansion Fahren Fahrenheit feet foot of air formula freezing-point Glaisher glass tube grains Greenwich heat horizontal hygrometer inches of mercury indicated instrument July Kew Observatory liquid magnet maxima and minima maximum mean daily range Mean monthly reading mean temperature meteorological meter moisture mometer month Negretti and Zambra observations taken oxygen ozone paper perature phenomena Plate portion pressure quantity rain-gauge rays Reaumur's record Regnault's rise Royal Observatory saturated scale Southampton stratum surface Table Temp temperature tension of aqueous thermo tion trace ture upper variation vertical vessel volume wet-bulb thermometers wind
Page 219 - ... 4. If fair weather continue for several days, during which the mercury continually falls, a long succession of foul weather will probably ensue ; and again, if foul weather continue for several days, while the mercury continually rises, a long succession of fair weather will probably succeed. 5. A fluctuating and unsettled state in the mercurial column indicates changeable weather.
Page 218 - In frost its fall indicates thaw : and its rise indicates snow. 3. Whatever change of weather suddenly follows a change in the barometer may be expected to last but a short time. Thus, if fair weather follow immediately the rise of the mercury, there will be very little of it ; and in the same way, if foul weather...
Page 219 - The barometer falls for southerly wind, including from southeast by south to the westward, for wet weather, for stronger wind or for more than one of these changes, except on a few occasions, when moderate wind, with, rain or snow, comes from the northward.
Page 219 - The barometer rises for northerly winds, including from northwest by north to the eastward for dry, or less wet weather, for less wind, or for more than one of these changes, except on a few occasions, when rain, hail or snow comes from the northward with strong wind.
Page 247 - ... sent duly (qualified persons to assist at a conference held at Brussels, last year, on the subject of meteorology at sea. The report of that conference was laid before Parliament, and the first direct result of it was a vote of money for the purchase of instruments and the discussion of observations. All the valuable meteorological data which have been collected at the Admiralty, and all that can be obtained elsewhere, will be tabulated and discussed in this new department of the Board of Trade,...
Page 219 - Whatever change of weather suddenly follows a change in the barometer may be expected to last but a short time. Thus, if fair weather follow immediately the rise of the mercury there will be very little of it ; and, in the same way, if foul weather follow the fall of the mercury it will last but a short time. (4...
Page 234 - ... of ozone can disinfect an equal volume of air so corrupted. Such experiments show how little appreciable by weight miasmata may be, which are yet sensible to the smell, and how small is the proportion of ozone necessary for the destruction of all the miasmata produced...
Page 175 - The Rain cloud. A cloud, or system of clouds from which rain is falling. It is a horizontal sheet, above which the Cirrus spreads, while the Cumulus enters it laterally and from beneath.
Page 293 - Correction to be applied to Barometers with Brass Scales, extending from the Cistern to the top of the Mercurial Column, to reduce the observation to 32° Fahrenheit.
Page 218 - The following rules may generally be relied upon, at least to a certain extent: — 1. Generally the rising of the mercury indicates the approach of fair weather ; the falling of it shows the approach of foul weather. 2. In sultry weather the fall of the mercury indicates coming thunder ; in winter the rise of the mercury indicates frost ; in frost its fall indicates thaw, and its rise indicates snow.