Symons's Monthly Meteorological Magazine, Volumes 3-4Edward Stanford, 1868 |
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Popular passages
Page 74 - After being subjected to sudden changes of pressure, the zero of an aneroid gradually changes, so that under such circumstances it ought only to be used as a differential and not as an absolute instrument, that is to say, used to determine the distance ascended, making it correct to begin with, or to ascertain the distance descended, making it correct to begin with, it being understood that the instrument ought to be quiescent for some time before the change of pressure is made.
Page 74 - If an aneroid correct, to commence with, be used for a balloon or mountain ascent, it will be tolerably correct for a decrease of about 6 inches of pressure.
Page 152 - But besides this aid, we may make use of it to enable us to tell the precipitation or evaporation. For instance, a very damp air, in passing over a very dry country, may be supposed to emerge less damp, having its hygrométrie quality changed ; or a very dry air, in passing over a very damp country, may be supposed to emerge less dry, having its quality changed in the opposite direction.
Page 114 - Another paper by the above authors, entitled " Account of some Recent Observations on Sun-spots made at the Kew Observatory," has likewise been ordered to be published in the
Page 152 - ... the moisture with the dry air. So much for the vertical component ; and in the next place, with regard to the production or consumption of aqueous vapour as it passes from place to place. "Our consideration has hitherto been confined to quantity ; let us now define what is meant by the hygromeiric quality of the air. It may be represented by the following quotient : — mass of vapour in a cubic foot...
Page 114 - Kew for the year 1868, have been communicated to the Astronomical Society, and published in their monthly notices.
Page 62 - January, 0-48 inch is the difference of pressure due to height — that is, the lake is about 400 feet above the sea. But since the mean pressure is nearly 30'3 inches, 0'88 inch is the pressure due to height ; the lake is therefore nearly 730 feet above the sea. Thus in July the lake would be made 350 feet too high, and in January 330 feet too low — the difference of the two observations, each being here supposed to be taken under the most favourable circumstances, and with the greatest accuracy,...
Page 195 - and of some other European countries systematic instruction is communicated " on this subject. But in this country few, even of the liberally educated " classes, are able to read from a vernier ; they are ignorant of the use of the...
Page 74 - From all these experiments we may perhaps conclude as follows : — (1) A good aneroid of large size may be corrected for temperature by an optician, so that the residual correction shall be very small. (2...
Page 170 - On the USE of ISOBARIC CURVES, and a LINE of GREATEST BAROMETRIC CHANGE in attempting to FORETEL WINDS. Illustrated by Fourteen Diagrams of Gales in January, 1867, and August, 1868, &c.