In the earliest the conductor was represented by long metal wires, supported by silk or other insulating material, and left to pick up the air's potential.
This was constructed of a shallow box placed in a vertical position, with metallic front and back and insulating sides.
Ebonite takes a fine polish, and is valuable to the electrician on account of its insulating properties, and to the chemist and photographer because vessels made of it are unaffected by most chemical reagents.
In conjunction with Josiah Latimer Clark, with whom he entered into partnership in 1861, he invented improved methods of insulating submarine cables, and a paper on electrical standards read by them before the British Association in the same year led to the establishment of the British Association committee on that subject, whose work formed the foundations of the system still in use.
Cavendish proved it by enclosing a metal sphere in two hemispheres of thin metal held on insulating supports.
4), consisted of two curved metal plates between which revolved a pair of balls carried on an insulating stem.
In the form of standard coil recommended by the Berlin Reichsanstalt the coil is immersed in an insulating oil which is kept stirred by means of a small electric motor during the time of making the measurement.
Granulated cork has practically the same insulating properties as silicate cotton, and the same thicknesses may be used.
For lager-beer cellars and fermenting rooms, for bacon-curing cellars, and for similar purposes, brick walls with single or double air spaces are used, and sometimes a space filled with silicate cotton or other insulating material.
In the Hospitalier ondograph, 1 a synchronous electric motor driven in step with the periodic current in the circuit being tested drives a cylinder of insulating material having a metallic slip let into its edge.
4), in an early form, consisted of a cell of insulating material having at its bottom a flat-headed platinum screw G; on the top of G was a layer of carbon powder C, on the top of that a platinum disk D, and above that again, forming the cover of the cell, a disk of ivory B, held in position by a ring E.
Thomson (Lord Kelvin) at a meeting of the Philosophical Society of Glasgow in 1854, because its greater flexibility renders it less likely to damage the insulating envelope during the manipulation of the cable.
17 and a thickness of insulating material which formerly would have been considered quite insufficient is now very generally adopted with complete success.
For various purposes a manufactured material known as "micanite" or "micanite cloth" is much used; this consists of small sheets of mica cemented with shellac or other insulating cement on cloth or paper.
On the 6th of May he makes further experiments, and concludes: "Hence I see no reason to expect that any kind of structure or tension can be rendered evident, either in decomposing or non-decomposing bodies, in insulating or conducting states."
The plates are placed in a vessel full of insulating oil which prevents the glow or brush discharge taking place over their edges.
In the point-by-point method the shaft of an alternator, or an alternating current motor driven in step with it, is furnished with an insulating disk having a metallic slip inserted in its edge.
On insulating the lower plate and raising the upper plate by the glass handle, the capacity of the condenser formed by the plates is vastly decreased, but since the charge on the lower plate including the gold leaves attached to it remains the same, as the capacity of the system is reduced the potential is raised and therefore the gold leaves diverge widely.
1, where W represents a portion of the wiring of the building and I a portion of the insulating materials surrounding it.
The microphonic portion of the transmitter is contained in a thin cylindrical box or case of brass A, the inner curved surface of which is covered with an insulating layer of paper.
Nansen perfected the instrument, adapting it not only for enclosing a portion of water at any desired depth, but by a series of concentric divisions insulating in the central compartment water at the temperature it had at the moment of collection.
For the purpose of measuring resistances up to a few thousand ohms, the most convenient appliance is a Wheatstone's Bridge (q.v), but when the resistance of the conductor to be measured is several hundred thousand ohms, or if it is the resistance of a so-called insulator, such as the insulating covering of the copper wires employed for distributing electric current in houses and buildings for electric lighting, then the ohmmeter is more convenient.
To prevent leakage over the surface of the insulating covering of the wire which projects above the surface of the water, it is necessary to employ a " guard wire P, which consists of a piece of fine copper wire, twisted round the extremity of the insulated wire and connected to the battery.
It was also necessary to give the fine charcoal a thin coating of calcium oxide by soaking it in lime-water, for the temperature was so high that unless it was thus protected it was gradually converted into graphite, losing its insulating power and diffusing the current through the lining and walls of the furnace.
3), each two inches in diameter and separately supported on insulating arms in the same plane, so that a third revolving plate B may pass very near them without touching.
The axis N 0 passes through the brass piece M, which stands on an insulating pillar of glass, and supports the plates A and C. At one extremity of this axis is the ball D, and the other is connected with a rod of glass, N P, upon which is fixed the handle L, and also the piece G H, which is separately insulated.
Tudsbury that if an influence machine is enclosed in a metallic chamber containing compressed air, or better, carbon dioxide, the insulating properties of compressed gases enable a greatly improved effect to be obtained owing to the diminution of the leakage across the plates and from the supports.
The acid process goes on much faster, because in it the heat insulating layer of slag is much thinner.
For the purpose of a standard condenser a number of concentric metal tubes may be arranged on an insulating stand, alternate tubes being connected together.
In examining the dissipation which takes place along imperfectly insulating substances, he found that a thread of gum-lac was the most perfect of all insulators; that it insulated ten times as well as a dry silk thread; and that a silk thread covered with fine sealing-wax insulated as powerfully as gum-lac when it had four times its length.
In 1876, Paul Jablochkov (1847-1894), a Russian officer, passing through Paris, invented his famous electric candle, consisting of two rods of carbon placed side by side and separated from one another by an insulating material.
The conductive particles (nano or micro) may be metallic, coated insulating particles or based intrinsically conductive particles (nano or micro) may be metallic, coated insulating particles or based intrinsically conductive polymers.
DO NOT attempt work involving sprayed asbestos, lagging or insulating boards, as this must be undertaken by a licensed asbestos removal contractor.
Reduce heat losses by fitting a hot water tank jacket, insulating hot water pipes and consider installing double-glazing.
A thermos or insulating flask allows hot drinks to be carried.
At the moment there are no facilities in the United Kingdom that are capable of removing such substances from the insulating foam of fridges.
insulate moment there are no facilities in the United Kingdom that are capable of removing such substances from the insulating foam of fridges.
insulate are surrounded by an insulating fatty sheath comprised of a complex protein called myelin.
insulatemos or insulating flask allows hot drinks to be carried.
insulateter tank - fit an insulating jacket to your hot water cylinder.
insulatet stage itself consists of a thermally insulating ceramic block which is attached to the NanoTest sample holder.
They are white, insulating solids with negligible small electronic conductivities and the bonding is mainly ionic.
Hot water tank - fit an insulating jacket to your hot water cylinder.
The Technical Service can calculate U-values for external roofs and walls to assist in selecting Knauf insulating laminates to meet thermal insulation targets.
Between the outer shell and the insulating layers is a 100% waterproof, breathable, seamless inner protective glove.
pulsed unbalanced magnetron sputtering is producing excellent insulating coatings.
The front sub frame is attached to the car by insulating rubber mountings.
At the site of a lesion, a nerve insulating material, called myelin, is lost.
Often many axons remain intact but are rendered useless by loss of their insulating myelin.
plasterboard backed with 100mm of phenolic insulating foam.
Less commonly the problem lies in the insulating myelin sheath.
short circuitions This push-fit plastic constructor kit is convenient as it is an insulating plastic, so will not short-circuit electrical projects.
With this technique, a metallic bridge on an insulating substrate is carefully stretched by mechanical bending.
Industrial strength insulating tape can be used to secure lengths of cable off the floor behind appliances.
Over insulating can cause the heat tape itself to overheat, even with a properly installed thermostat.
Other tips include appointing a water monitor, sorting out dripping taps and insulating water pipes.
At an intermediate O _ _ O or wayside station W, a a B = a `_ " switch " S, consisting of three blocks of brass fixed to an insulating © © © base, is sometimes used FIG.
This surface is divided into two parallel halves by a short insulating space on which the arm normally rests, so that two separate conducting surfaces are provided, with either one of which the arm will make contact in its excursions in one direction or the other from the central position, the direction and duration of contact being governed by the motion of the suspended coil.
In another form, a revolving contact is used driven by an electric motor, which consists of an insulating disk having on its surface slips of metal and three wire brushes a, b, c (see fig.
The inner platinum ends DD of the wire may be sealed into the glass insulating tubes, but reliance should not be placed upon these sealings.
Volta then proved that all metals could be arranged in an electromotive 1 Modern researches have shown that the loss of charge is in fact dependent upon the ionization of the air, and that, provided the atmospheric moisture is prevented from condensing on the insulating supports, water vapour in the air does not per se bestow on it conductance for electricity.
LEGO Dimensions This push-fit plastic constructor kit is convenient as it is an insulating plastic, so will not short-circuit electrical projects.
Wood is good at both insulating and letting the roof breathe during the warmer months, but it is not nearly as durable as the other two materials.
It mimics the lightness and spring of down, as well as down's insulating characteristics.
Its insulating properties make it warm and inviting in cold weather.
Insulating your home can help to reduce the amount of energy that is required to heat or cool your home.
In addition to insulating your home, you should also check windows for drafts and fit draft excluders where required.
By insulating your home thoroughly, you'll prevent heat loss in the winter and heat gain the summer.
Just as with straw bale homes, straw bale cold frames use the mass of the insulating straw walls to buffer the temperature difference between outside and inside.
Insulating Concrete Form (ICF): Used in construction of exterior walls, ICFs are permanent structures and come in either interlocking blocks or panels made of insulation materials.
It comes in either expanded or extruded forms and is used when insulating foundation walls (in a basement, for example).
In some states utility companies will send a representative to your home to offer insulating and weatherizing tips to help reduce energy bills.
You'll need to gently press it into place, without compressing it, which could decrease its insulating power.
If they are not adequate at insulating, you will need to buy separate insulation to install along with the tiles.
These ceiling tiles are approved as fire safe and despite being plastic, do a good job at insulating the room.
Insulating material is rated based on its R-Factor, a function of thermal resistance, or the ability of the medium to insulate against heat loss.
Where R-Factor is concerned, increasing the thickness of the insulating layer will also increase the R-Factor of the material.
Fiberglass has been used as an insulating medium in homes for decades.
Insulating your attic stairs can lower your heating and cooling bills instantly by sealing off this escape route.
An insulating wall is built around the opening to your attic, with a lid that fits down over it.
How thick will he pour the insulating concrete to keep the heat indoors around the circulating pumps?
However, plastic isn't very aesthetically pleasing, and on very windy or especially cold or hot days, plastic doesn't help a whole lot with insulating the home.
They are far more effective than plastic because they provide an insulating gap of air between two window panes.
Some windows are also double-paned, providing an additional insulating vacuum barrier.
No matter how you look at it, storm windows offer the most insulating qualities for the lowest investment of all options.
Each manufacturer has a recommended number of bags for insulating a 1,000 square-foot space.
While these cans provided an excellent solution to solving minor draft or insulation problems, they were inadequate for larger applications like insulating a garage attic or an empty wall cavity.
Turn both canisters on and point the tip of the spray nozzle at the area you are insulating.
DIY spray foam canisters can be found at most home improvement stores, but not all of them offer large-scale insulating solutions.
Flannel's versatility comes from its insulating capabilities, and in pajamas, both sides are usually brushed to create an especially cozy feel.
Wool fibers are excellent for insulating the feet.
First of all, it naturally resists water and its insulating qualities are known to keep people warm when other fabrics fail.
Many nerve cells have long, wire-like axons that are covered by an insulating layer called the myelin sheath.
Axons are covered by sheaths of an insulating whitish substance called myelin, and the region in which they lie is accordingly called white matter.
Practice home energy saving tips, such as only washing full sinks of dishes and covering windows with insulating plastic in the winter.
Water Heater Blanket: An insulating blanket (available from home improvement stores) can be wrapped around a water heater to save energy and keep the water reservoir warm far longer than if it is uncovered.
After you pull on some thermals, consider an insulating layer such as a wool sweater or a down jacket.
Just like boots for dad, boys' winter boots tend to fall on the more rugged side and are made of leather, suede, nubuck or insulating materials.
These short boots are perfect for women who live in more temperate locales -- they still want winter-specific footwear, but they don't need the insulating qualities of fur or long boots.
These gowns are typically very comfortable and because flannel offers such insulating warmth, warm!
Cashmere has superior insulating properties to keep you warm in winter or cool in summer.
In cold weather, its natural insulating properties keep you warm.
Along with their insulating qualities, some robes have organic bamboo blended into the chenille.
These uniform jackets appear the same but provide different insulating properties.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.