Frictional electrical machines can be purchased from any electrical instrument makers, at a small price, and with these experiments mentioned are more readily performed.
Theory of Frictional Errors and the Isochronal Hairspring.
Theory teaches us in brief, that the position adjustment is made necessary principally because of frictional errors.
The joint then possesses the high strength of a wrought-iron one and at the same time the goodfrictional qualities of a brass surface.
The maximum frictional resistance is independent of the area of contact, the velocity of rubbing, or any other conditions than intensity of pressure and condition of surfaces.
He further states that these "laws" are not absolutely exact, as here stated, so far as they affect the magnitude of frictional resistance.
The coefficient of friction is that quantity which, being multiplied by the total pressure acting normally to the surfaces in contact, will give the measure of the maximum frictional resistance to motion.
The direction of frictional resisting forces is in the common tangent plane of the two surfaces, and directly opposed to their relative motion.
The amount of frictional resistance to the motion of machinery is obviously determined by the character of the lubricating material.
Undoubtedly there is a frictional wake in the case of aeroplanes, possibly quite as much in proportion as in the case of a boat, allowing for difference of medium.
Sometimes, too, the frictional resistance of the gases through an economizer make its adaptability questionable because of the draft conditions.
The cross sectional areas of the passages leading from the boilers to the stack should be of ample size to provide against undue frictional loss.
Determine the cross sectional area necessary to handle the gases without undue frictional losses.
Cord wood and slabs form an open fire through which the frictional loss of the air is much less than in the case of sawdust or hogged material.
These figures are also good for square or rectangular steel flues with areas sufficiently large to provide against excessive frictional loss.
Where the temperatures are low, the added frictionalresistance will ordinarily be too great to allow the draft required to be secured by additional stack height and the installation of a fan is necessary.
Artificial reservoirs are usually constructed on the near outskirts of a town in order that the frictional force lost in transmission may be reduced to a minimum.
Motion is communicated to the rope by frictional contact with the drum, which is covered through about one-half of the circumference.
But this very increase of the driving force causes a greater pressure of the teeth of the scape-wheel on the rest-faces of the pallets, and hence counteracts the increased drive of the pendulum by an increased frictional retardation.
This is accomplished by frictional means to indicate the power, and by the use of weights to determine the lift.
An object lying on the ground has the frictional resistance of the earth to prevent its moving.
Block segments G are placed between the chain and pulley B, and when the bolts E are tightened the pulley is held by frictional contact between the block C and the segments G.
It was heavy, shaped like the pressure door on an airplane fuselage, and designed to withstand the frictional heat of space flight.
He watched the wheels slide across the patch of gelignite, creating instantaneous frictional heat.
The asymmetry of the crystal, due to a one-sided working of the forces of crystallization, plays the same role here as does the alchemic opposition between the two bodies used for the production of frictional electricity.
These few facts connected with the generation of frictional electricity are enough to allow us to form a picture of the nature of the polarity represented by the two kinds of electricity.
Just as in the case of frictional electricity, the kind of electricity which is supplied by a certain metal depends on whether the other metal with which it is coupled stands to the right or to the left of it in the series.
The similarity between this process and the frictional generation of electricity is evident.
Among his writings there is a treatise on electricity, giving many generally unknown instances of frictional electricity which are in good accord with our picture and well worth investigating.
Both the recording stylus and reproducing ball are made of sapphire, chosen on account of its hardness, to resist the great frictional wear to which they are subjected.
It consists of a series of brake shoes which, when brought into frictionalcontact with the cylinder 5, are made to act on small vertical rods which bring down the keys just as the fingers do in playing.
Nicholson and Carlisle discovered frictional electricity while William Cruickshank showed that a voltaic current decomposes solutions of metallic salts.
William Hyde Wollaston used Cruickshank's discovery to prove that frictional and voltaic electric currents are identical.
It is not a phenomenon of mechanical impact or frictional resistance, since neither are possible in the ether.
Another consideration is that the magnetic field itself, when moved in space, suffers nofrictional resistance.
It will spin longer on a plate than on the carpet, and longer in a vacuum than in the air, for it does not have the air friction to resist it, and there is no kind or form of matter not subject to frictional resistance.
The idea was soon abandoned, and to-day there is no astronomical evidence that bodies having translatory motion in the ether meet with anyfrictional resistance whatever.
This principle is apparently contradicted in many cases of transformation, since it is impossible to transform energy by natural process, or by the use of mechanism, without doing work in overcoming frictional or resisting forces.
It so happened, as a consequence of the method of producing the drops, that they carried a small frictional charge, and incidentally Millikan was able to verify that this was always an integral multiple of the electronic charge e.
This was quite apart from the frictional resistance offered to the upper thread in passing over the cavity of the hook.
This is not to say that the frictional resistance is greater in proportion to the thrust at high than at low speeds.
His object now is to comparefrictional with voltaic electricity.
This introduces a fixed element offrictional resistance which does not decrease with the increasing smoothness of the interior surface of wood pipe, and probably accounts for the higher resistance of the 16-in.
The explanation is found in the high frictional resistance between the band and the pipe, which distributes the weakness of a bad splice over several adjacent turns of the band around the pipe.
At each end the spiral wind is doubled two turns, the second lying over the first and developing a frictional resistance similar to that of a double hitch of a rope around a post.
Equally unacquainted are they generally with the diverse physiological action of the several modifications of the electric force--galvanism, magnetism, faradism, and frictional electricity.
To avoid the difficulties with frictional contacts, the preferred plan adopted was to establish the arc and rotate through it at great speed a rim of mica provided with many holes and fastened to a steel plate.
I might take a familiar appliance, a Leyden jar, charge it from a frictional machine, and then discharge it.
The rubber disc h with its metallic segments s s, was finished in a lathe, and its entire surface highly polished so as to offer the smallest possible frictional resistance to the motion through a fluid.
But to a certain degree resonance is producible, the magnitude of the effects being limited by the imperfect conductivity and imperfect elasticity of the media or, generally stated, by frictional losses.
It is desirable, in order to maintain the vibration economically, to reduce the impact and frictionallosses as much as possible.
All the frictional losses occur then practically in the air.
In such a case, as far as the body itself is concerned, only frictional losses in the inside could occur.
This has the advantage of reducing greatly the wear and corrosion of the parts coming in frictional contact with the rod, which frequently causes trouble.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "frictional" in a variety of sentences. We hope that you will now be able to make sentences using this word.
