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adopted amount applied aqueous vapour atmosphere barometer becomes bulb causes changes climate clouds column combined compared considerable construction continued correction cubic foot curve cylinder daily described determined dew-point direction divided earth effect elastic electricity equal evaporation expansion extreme fall feet fixed force give given glass grains Greenwich heat higher horizontal important inches increase indicated January July laws length less light lower maximum mean temperature measure mercury meteorological meter moisture month monthly observations Observatory obtained ozone pass phenomena Plate portion position present pressure produced quantity rain range reached reading received record reduced rise Royal saturated scale shown space standard surface Table taken takes Temp tension thermometer throughout tion trace tube upper usual variation various vertical vessel volume weight wet-bulb whole 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.