See Marvin, Barometers and the Measurement of Atmospheric Pressure (1901); and C.
But the instrument failed as all water-barometers do, for the gases dissolved in the water coupled with its high vapour tension destroy its efficacy.
In constructing the best barometersthree materials are employed, viz.
Since capillarity depresses the height of the column, cistern barometers require an addition to be made to the observed height, in order to give the true pressure, the amount depending, of course, on the diameter of the tube.
Much obscurity surrounds the invention of barometers in which variations in pressure are rendered apparent by the alteration in the volume of an elastic chamber.
Before being used, barometers should be thoroughly examined as to the state of the mercury, the size of cistern (so as to admit of low readings), and their agreement with some known standard instrument at different points of the scale.
In some barometers the cistern is fixed, and the ivory point is brought to the level of the mercury in the cistern by raising or depressing the scale.
Barographs" are barometerswhich automatically record any variations in pressure.
There he made barometers and thermometers as well as glasses for philosophical experiments.
Correction to be added to Barometers for Capillary Action.
Some of the greatest questions in meteorology depend on its due execution, and the objects for which these instructions have been prepared will be greatly advanced by the zero points of all barometers being referred to one common standard.
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.
In barometers furnished with a fiducial point for adjusting the lower level, this correction is superfluous, and must not be applied.
The effects on the air of minor paroxysmal outbreaks are also recorded by this instrument; but barometersin the most distant places record the same disturbance.
Barometers in the principal cities of the world automatically recorded this effect of the first great wave from Krakatoa to its antipodes in Central America, and also the return wave.
In 1704 he noted that barometers are affected by heat as well as by the weight of the atmosphere, and in the following year he described barometers without mercury, for use at sea.
Abbe, Meteorological Apparatus; Marvin, Barometersand the Measurement of Atmospheric Pressure.
I have determined to get the barometers from the wreck, if they are there.
The summit of the cliff is 3,000 feet above the river, as our barometers attest.
But, in the distribution, there was one exception to this precaution--the barometers were all placed in one boat, and they are lost!
Can I go out to Salt Lake City and obtainbarometers from New York?
Our hopes are that the worst places are passed, but our barometers are all so much injured as to be useless, and so we have lost our reckoning in altitude, and know not how much descent the river has yet to make.
It is a very exceptional piece, but there are other barometers of considerable beauty in the hands of collectors of old bronze and metal-work.
It was so before the day of barometers and scientific instruments, and it is equally so by those who prefer the pronouncement of the weather prophet rather than the barometer gauge.
Furthermore, water barometers cannot be used in any countries where the temperatures fall to freezing.
Mercurial barometers of the Weather Bureau pattern are best hung in a barometer box, fastened securely against the wall of a room, where there is a good light on the instrument and where the temperature is as constant as possible.
This strip, for barometers used at or near sea level, is about 4 inches long, the variations in pressure under normal conditions not exceeding that amount.
A pamphlet of information respecting the theory and construction of barometers in general, with summary of instructions for the care and use of the standard Weather Bureau instruments.
Barometers and the Measurement of Atmospheric Pressure.
They may be adjusted to mercurial barometers by means of a small screw, whose head may be found on the lower surface of the instrument.
I was fortunate in being able to compare my barometers with a first-rate standard instrument, and in finding no appreciable alteration since leaving Calcutta in the previous April.
In very dry climates these and all other barometers are apt to leak, from the contraction of the box-wood plug through which the tube passes into the cistern.
I hung the barometers near one of the many chaits on the summit, where there is also a rude temple, in which worship is performed once a year.
The barometers mark twelve hundred metres, then thirteen, fourteen, fifteen hundred; and the little rice papers still fall about us.
The two barometers mark about five hundred meters, and we gaze with enthusiastic admiration at the earth we are leaving and to which we are not attached in any way; it looks like a colored map, an immense plan of the country.
Mallet leave his net and return to the basket; then we pack the barometers and everything that could be injured by possible shocks.
On landing, the barometers were set up at the edge of the water and read off, and at the same moment the barometer on board was read off.
Engleman's barometers at St. Louis, to which mine were referred; but it had done its part well, and my objects were mainly fulfilled.
It is true that people buying barometers do not usually pay the workmen for making them; a man with capital gets the barometers made beforehand and puts them in shops ready for sale.
The capitalist advances the wages of the workmen, but this is only for a few weeks or months, and according as the demand for barometers is brisk or slow, he employs more or fewer workmen.
Now," said George, "father will tell us aboutbarometers and thermometers, as he promised.
Good barometers require the greatest possible care in their construction, and there ought to be two or more standing together as checks on one another in order to obtain correct results.
If weather forecasters had only their own barometers to go by, they would not be of much value; for one thing, they could not tell us that a storm was coming much before it reached us.
It is not necessary, therefore, to carry the scales of marine barometers beyond these limits, but they should not be made shorter.
It has been remarked by persons in the habit of reading barometers with large tubes, that, in squally weather, sudden and frequent oscillations of the mercurial column are sometimes seen.
The scales of standard barometers are usually divided into half-tenths, or .
In a third series of experiments, Mr. Negretti being present, five of the new pattern barometers were subjected to the concussion produced by firing a 68-pounder gun with shot, and 16 lbs.
These barometers are graduated to hundredths, and they will be found accurate to that degree, namely the second decimal of an inch.
This latter word appears to be applicable to all kinds of self-registering barometers hitherto designed.
In all barometers it is requisite that the space above the mercurial column should be completely void of air and aqueous vapour, because these gases, by virtue of their elasticity, would depress the column.
It differs from barometers hitherto made in points of detail, rather than principle:--1.
Marine barometersrequire to be suspended, so that they may remain in a vertical position under the changeable positions of a vessel at sea.
The hands of watches and the numbers of dial-faced barometers run from left to right: this is a peculiarity dependent upon the left to right system of writing.
For example, if the height of barometers in different localities is observed at exactly the same time, and if all the cities and towns which have the same pressure are connected by a line, the curved lines will be called isobars.
The aneroid barometers are frequently made no larger than a watch and can be carried conveniently in the pocket, but they get out of order easily and must be frequently readjusted.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "barometers" in a variety of sentences. We hope that you will now be able to make sentences using this word.
