The power of this wheel will be, of course, in proportion to the vacua produced in manner aforesaid, and to the altitude of the columns of mercury employed.
It is necessary to apply to the results thus obtained a correction which becomes very important when highvacua are measured.
For the purpose of measuring the vacua I have used an arrangement similar to McLeod's gauge, Figure 4; it has, however, some peculiarities.
In the July number of this Journal for 1880, I gave a short account of certain changes in the Sprengel-pump by means of which far better vacua could be obtained than had been previously possible.
On the Method of Obtaining and Measuring Very High Vacua with a Modified Form of Sprengel Pump.
Apparatus for obtaining vacua of one four hundred-millionth of an atmosphere--Construction.
Very high vacua can be obtained with the Leblanc pump, but the power required to drive it is more than is required with a 3-throw piston-pump.
In nearly all pumps for producing the high vacua necessary, e.
But to reach extreme vacuathe appliances must be much more improved, and ultimate perfection will not be attained until we shall have discharged the mechanical and perfected an electrical vacuum pump.
Think we as we may, of all the possible directions to develop a practical illuminant, the line of high vacua seems to be the most promising at present.
With disruptive discharge coils there are sudden rises of potential and the vacua are more quickly impaired, for the electrodes are deteriorated in a very short time.
It is an undeniable fact that with very high frequencies, provided the impulses be of harmonic nature, like those obtained from an alternator, there is less deterioration and the vacua are more permanent.
Both of these results enable us now to pass a luminous discharge through almost any vacua obtainable, and the field of our investigations is greatly extended.
But first, the object of sensation was an atomic compound having some appreciable bulk, while that of thought might be separate atoms or vacua so minute as to be invisible and intangible.
He believed that there are vacua existing between the innumerable particles which constitute matter in all its states and forms.
But to reach extreme vacua the appliances must be much more improved, and ultimate perfection will not be attained until we shall have discarded the mechanical and perfected an electrical vacuum pump.
Puluj declares that the phenomena I have described in high vacua are produced by his irregularly shaped lumps of radiant electrode matter.
In recording my investigations on the subject of radiant matter and the state of gaseous residues in high vacua under electrical strain, I must refer to certain attacks on the views I have propounded.
The study of apparatus for obtaining more perfect vacua was unceasingly carried on, for Edison realized that in this there lay a potent factor of ultimate success.
Not even Sir William Crookes's vacua can give an idea of the rarefaction which this fact implies.
Another illustration of the power of cooled charcoal to produce high vacua is afforded by a Crookes radiometer.
Exceedingly high vacua can be obtained by the aid of liquid gases, with or without charcoal.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "vacua" in a variety of sentences. We hope that you will now be able to make sentences using this word.
