A Treatise on Meteorological Instruments: Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility, Nide 3Negretti & Zambra, 1864 - 160 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 25
Sivu 3
... glass cylinder containing the mercury . At the top of the interior of the cistern is fixed a small piece of ivory , A , the point of which DB Fig . 2 . 70 60 40 # 31 29 Fig . 3 . FORTIN'S BAROMETER . 3 Fortin's Barometer Cistern.
... glass cylinder containing the mercury . At the top of the interior of the cistern is fixed a small piece of ivory , A , the point of which DB Fig . 2 . 70 60 40 # 31 29 Fig . 3 . FORTIN'S BAROMETER . 3 Fortin's Barometer Cistern.
Sivu 10
... contain the mercury , which falls from 31 to 27 inches , without any appreciable error on the height read off on the scale . 12. The Words on the Scale . - The following words are usually engraved on the scales of these barometers ...
... contain the mercury , which falls from 31 to 27 inches , without any appreciable error on the height read off on the scale . 12. The Words on the Scale . - The following words are usually engraved on the scales of these barometers ...
Sivu 13
... containing less moisture , blow more from the land . The weight of the vapour of the warm winds tends to raise the barometric column ; but , at the same time , the increased dilatation of the air tends to lower it . This latter ...
... containing less moisture , blow more from the land . The weight of the vapour of the warm winds tends to raise the barometric column ; but , at the same time , the increased dilatation of the air tends to lower it . This latter ...
Sivu 26
... contain in general but little moisture ; and hence , on reaching a warmer latitude , wil take up the vapour of the air , so that dry weather will result . It is generally observed , that wind causes a fall in the instrument ; and ...
... contain in general but little moisture ; and hence , on reaching a warmer latitude , wil take up the vapour of the air , so that dry weather will result . It is generally observed , that wind causes a fall in the instrument ; and ...
Sivu 29
... containing the tube and fixtures . The dial is covered by a glass in a brass rim , similar to a clock face . A brass index , working over the dial , moveable by a key or button , may be applied , and will serve to register the position ...
... containing the tube and fixtures . The dial is covered by a glass in a brass rim , similar to a clock face . A brass index , working over the dial , moveable by a key or button , may be applied , and will serve to register the position ...
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Muita painoksia - Näytä kaikki
Yleiset termit ja lausekkeet
actinometer adjusted Admiral FitzRoy alcohol amount anemometer aneroid aqueous vapour ascertaining atmospheric pressure attached Barograph barometric column boiling-point boxwood brass bulb changes of temperature cistern cold constructed contraction correction cylinder decrease degree dial diameter difference ditto Drosometer electricity elevation evaporation fall feet fixed float fluid frame funnel gauge glass tube graduated heat height Hence horizontal hygrometer inches inches of mercury increase indications instru instrument International Exhibition 1862 invented ivory JAMES GLAISHER latitude limb liquid lower maximum means measuring ment mercurial barometer mercurial column mercury falls Messrs metal meteorological meter minimum temperature minimum thermometer moisture mometer motion move needle Negretti and Zambra observation ordinary paper placed plate platinum pointer portable position quantity radiation thermometer rain reading rise Rutherford's scale screw self-registering solar radiation specific gravity surface sympiesometer syphon Table temperature tension ther upper vernier vertical weather wind zero
Suositut otteet
Sivu 84 - The refrigeration at night is extreme when the air is dry. The removal, for a single summer night, of the aqueous vapour from the atmosphere which covers England, would be attended by the destruction of every plant which a freezing temperature could kill. In Sahara, where 'the soil is fire and the wind is flame,' the cold at night is often painful to bear.
Sivu 11 - ... and then fall, it presages a change, though not to so great a degree as if it had stood lower : besides which, the direction, and force of wind, are not in any way noticed. It is not from the point at which the mercury may stand that we are alone to form a judgment of the state of the weather, but from its rising or falling ; and from the movements of immediately preceding days as well as hours, keeping in mind effects of change of direction, and dryness, or moisture, as well as alteration of...
Sivu 19 - ... much lower than the lowest pressure to which marine barometers are likely to be exposed ; and by compressing the air it can be made to read higher than the mercury ever stands at the level of the sea. The tube of the standard is contracted...
Sivu 26 - A rapid rise Indicates unsettled weather. A gradual rise indicates settled weather. A rise with dry air and cold increasing- in summer indicates wind from the northward; and if rain has fallen, better weather may be expected. A rise with moist air and a low temperature indicates wind and rain from the northward.
Sivu 85 - Shallow pits are dug, which are partially filled with straw, and on the straw flat pans containing water are exposed to the clear firmament. The water is a powerful radiant, and sends off its heat copiously into space. The heat thus lost cannot be supplied from the earth — this source being cut off by the non-conducting straw. Before sunrise a cake of ice is formed in each vessel.
Sivu 105 - ... passes into a vessel of water, placed at such a distance as to allow a length of conducting thread of about three inches. The cup or glass is placed on one side and a little beneath, so that the water within may not affect the reading of the dry butt) thermometer.
Sivu 53 - ... deteriorate in time, though slowly." " The aneroid is quick in showing the variation of atmospheric pressure ; and to the navigator who knows the difficulty, at times, of using barometers, this instrument is a great boon, for it can be placed anywhere, quite out of harm's way, and is not affected by the ship's motion, although faithfully giving indication of increased or diminished pressure of air.
Sivu 88 - Into the cylinder this thermometer d, is introduced, the stem of which is protected by a piece of brass tubing. We thus obtain the temperature of the mercury. The flat end of the cylinder is to be turned towards the sun, and the surface thus presented is coated with lampblack.
Sivu 19 - The divisions on this scale correspond exactly with those on the tube of the standard barometer. A vernier and telescope are made to slide on the scale by means of a rack and pinion. The telescope has two horizontal wires, one fixed and the other moveable by a micrometer screw, so that the difference between the height of the column of mercury and the nearest division on the scale of the standard, and also of all the other barometers placed by the side of it for comparison, can be measured either...
Sivu 81 - The result of this is that on the thermometer being set, the contracting force of the mercury in cooling withdraws the fluid in the indicating stem only, whilst on its expanding with heat the long column does not move, the increased bulk of mercury finding an easier passage through the larger bore into the small pear-shaped chamber attached.