Some bodies, like dry wood, that readily conduct the high potential static electricity, make fairly goodinsulators for the low potential galvanic currents.
Multiple disc insulators are used, four discs being used to suspend each conductor from standard towers and ten discs to each conductor on strain towers.
The insulators are fitted with iron ends for securing the different parts.
The live parts are mounted on porcelain insulators carried on a cast iron yoke or base, forming a simple and substantial construction.
Because of the fact that no insulators are required, solely to support this choke coil, and that it can be installed in either a vertical or a horizontal position it can often be utilized effectively in power and sub-station layouts.
This equipment, together with the lightning arrester horn gaps and the heavy line outlet insulators mounted on the roof of the power house, is shown in fig.
The coils~ are insulated according to the standard practice for disconnecting switches, the insulators being mounted on wooden pins supported by a wooden base.
The number of insulators used in the columns depends on the voltage of the circuit in which the coil is to be used.
The upper or stationary contacts are mounted on porcelain insulators secured in the soapstone base.
The pantograph and contacts are supported on corrugated porcelain insulators on a hardwood base or insulator board.
In the study of conductors and insulators it was observed that an electric charge moved along the conducting rod to the electroscope.
Are conductors or insulators of the greater importance in practical electricity?
In the open country, telephone lines consist of bare wires of copper, of iron, of steel, or of copper-covered steel supported on insulators borne by poles.
If the wires on the poles be many, cross-arms carry four to ten wires each and the insulators are mounted on pins in the cross-arms.
If the wires on the poles be few, the insulators are mounted on brackets nailed to the poles.
The insulators generally employed for such purposes are cup-shaped pieces of porcelain, or pottery, fixed to the head of the telegraph posts.
Since it is difficult to exclude the gas perfectly when solid insulators are used, it is necessary to resort to liquid dielectrics.
The boys were forcing wedge-shaped wooden blocks or pegs, to which insulators were fastened, into cracks between stones of the turret floor.
The two grooved tubes are suspended from insulators fixed upon external cast iron supports.
As for the conductors, which have their resting points upon ordinary insulators mounted at the top of the same supports, these are cables composed of copper and steel.
The insulators are usually of glass or porcelain, which in certain patterns may be filled with oil, to insure better insulation as shown in figs.
Glass insulators are generally used on low tension lines, and porcelain insulators on high tension lines, the latter type being usually stronger and less brittle.
The reels are placed at the beginning of a section, each wire being inserted and secured through a separate hole in a board, which is perforated to correspond with the spacing of the insulators on the cross arms.
Both glass and porcelain insulators may be the double or triple petticoat type which may be cast or moulded solid, or made in two or more parts which are subsequently cemented together.
Service wires tapped to the main wires, are run to insulators on an auxiliary cross arm, thence to insulators on the side of the building, and through the drain tube to the service switch.
Such insulators are intended to act as circuit breakers, the particular wire to be transposed being cut and "dead ended," or tied around, on both the upper and lower grooves of the cap.
Standard rules specify that all wires shall be tied to the side of the insulators toward the pole, except on the insulators next to the pole, where they are to be attached on the opposite side.
The erection and guying of the poles of a line as well as the attachment of the cross arms and the screwing on of the insulators are completed before the stringing of the line is begun.
Insulators should always be provided where wires cross to support the wires, thus preventing the upper wires sagging and touching those below.
All arc light wiring of this class should be in plain sight and never enclosed, except when required, and should be supported on porcelain or glass insulators which separate the wires at least one inch from the surface wired over.
When installed in dry places and for pressures below 300 volts, the insulators should separate the wires 2½ inches from each other and ½ inch from the surface along which they pass.
These insulators are made in various sizes and may be obtained in earthenware or glass.
Insulators were also exhibited by Pass & Seymour, of Syracuse, and the Empire China Works, of Brooklyn.
Conductors and Insulators About this time other great electrical discoveries were made.
Bare wires in the air with glass insulators at the poles are used for land telegraphy, but bare wires in the water could not be used, for ocean water will conduct electricity.
Could this obscure inventor have seen a modern telegraph line with the glass insulators on the poles, which prevent the electric current escaping from the telegraph wire, he might have realized the importance of his discovery.
It can be continued only in insulators by the same portion of electricity, because they only can retain this state of the particles (1304).
In this view, insulators may be said to be bodies whose particles can retain the polarized state; whilst conductors are those whose particles cannot be permanently polarized.
If any portion of the air was electrified, as glass or other insulators may be charged (1171.
As the insulators are of the same size in each case, the length of the pin between the lower edge of each insulator and the top of the cross-arm is 4 inches on the Colgate line and 3-1/2 inches on the Electra line.
These towers differ from the others in that each carriesinsulators for only three conductors, and these insulators are all at the same level.
Wood is the most common material for pins on which to mount the insulators of high-voltage transmission circuits.
In the older types of insulators the lower wet edge often came within two inches of the cross-arm.
It seems at least doubtful whether any enlargement or improvement of the insulators themselves will entirely avoid the destruction of their wooden pins in one of the ways mentioned.
For these reasons the general use of iron or steel pins for the insulators of long lines operating at high voltages seems desirable.
In good practice it is thought desirable to test insulators for puncture with at least twice the voltage of the circuits which they will be required to permanently support on transmission lines.
When the insulators were covered with wet snow their surface insulation broke down at voltages that were within ten per cent above or below the arcing voltages during a moderate rain in five cases.
With wooden poles about four times as many pins and insulators are required as with steel towers, or say twelve pins and insulatorson poles instead of three on a tower.
This power of propagation possessed by insulators he called their 'Specific Inductive Capacity.
It acted by induction upon the concave surface of the latter, and he examined how this act of induction was effected by placing insulators of various kinds between the two spheres.
Different insulators possess this power of permitting the charge to enter them in different degrees.
The trolley system, with overhead cable attached to insulators on posts, to carry the current one way, the rails being used as the "return.
The remedy is to exclude it, or keep the insulators warm and dry, or coat them with shellac varnish, wax, or paraffin.
The distinction between conductors and non-conductors or insulators was first observed by Stephen Gray, a pensioner of the Charter-house.
However, strong arms at the bottom held it pretty steady, and Harry was enabled to nail on his insulators with comparative ease, and in a very satisfactory manner.
Electrical Insulators Insulators are the opposite of conductors.
The form of conductors and insulators used will depend upon the current and many other conditions.
The landlord may know that heat insulators would earn a big return on their cost, but since they would earn it for the tenant and not for himself, he does not cover the boiler and pipes adequately, if at all.
The tenant, even if he knows the economics of heat insulating, will not spend the money for insulators whose use he may not enjoy for more than a year or two before he moves out.
We sold glass insulators by the hundred as patent American teacups, and brackets by the thousand as prepared American kindling-wood.
In other words, if light is an electro-magnetic disturbance, all conducting substances must be opaque, and all good insulators transparent.
This leakage occurs both between the line conductors and at the insulators placed on the pole lines forming the line circuit.
The insulators are made either of glass or porcelain, and are of a peculiar form known as triple petticoat pattern.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "insulators" in a variety of sentences. We hope that you will now be able to make sentences using this word.
