What is information on antique carbon arc projectors?


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2011-09-13 16:11:12
2011-09-13 16:11:12

I use to operate these prjectors in the 70's-80's before they were replaced by 1500 watt zenon bulbs. Only the lamp housing was changed out, the projector and film part stayed the same. The carbon rods were replaced quite often. The film was split up in about 20 minute reals usually 5 to 6. When it looked like the rod would not make it we would change it. It was a gamble if you had a short real or commercial if a small rod would make it. These ran on a AC to DC motor generator. When I came abord we used a diode unit mutch quiter but the motor-generator where still kept and we could switch over if the diode unit failed. Witch never did in around 15 years. Peerless made the projectors. These were in the bay area California USA


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An arc lamp is a lamp that produces light by an electric arc. The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the early 1800s, was the first practical electric light.

A carbon arc emission spectrograph is a piece of scientific equipment. Emission spectography is used to measure radiation intensity, and provides information about atoms and molecules as well as chemical composition of objects.

The arc has projectors coming up every night at dark, but otherwise there is no special scenery.

Arc lamps were invented in the 1940's and have many uses. Some of the uses are movie projectors and car headlamps. Arc light are also used to simulate sunlight in different types of equipment testing.

You have two electrodes mad out of carbon, and then you cause a sparc to arc over from one electrode to the other. By maintaining this arcing you get light.

Any electrode holder that will accommodate the size of rod can be used. Twin Carbon Arc Welding requires a specific holder. Air Carbon Arc Gouging requires a special holder that also supplies a stream of air.

Carbon arc lighting died out decades ago. The only carbon arc lamps still used today are restored World War II searchlights used for promotional purposes.

Any welding supply carries or can order for you, air arc carbon rods. They are the same that is used for air carbon arc gouging. Carbons are produced in two shapes, flat and round and various sizes. You would want the round ones.

Yes, if the heat of the arc exceeds the melting point of the material arcing. For example, carbon rods are used in very old movie projectors to generate an arc as a light source; due to their high melting point, they do not melt from the arc. Switches and relays, though, use contact materials with a much lower melting point and can easily be melted by the arc. This is why such devices have a maximum current rating. Welding systems used to intentionally melt metals together, such as "stick" welding, MIG welding, and TIG welding, intentionally use an arc to create temperatures in excess of 4000 degrees F.

a carbon rod or a pencil used in an arc lamp; also, a plate or piece of carbon used as one of the elements of a voltaic battery.

I have placed two links below with information about Joan of Arc.

you use carbon electrodes in a electic arm holder that creates a arc at the bottom and melts any steel that comes through it.

The answer depends on the information that you have. If the arc subtends an angle of x radians in a circle with radius r cm, then the arc length is r*x cm.

It depends on what information you do have.

delivery of sensory information.....

Biography's website is one source where a biography of Joan of Arc can be found. Wikipedia is also a excellent source of Joan of Arc bio information.

Carbon arc is an old welding method which uses relatively low voltage, high amperage electricity to heat metal when an arc is established between a carbon electrode and the work (single-carbon arc) or between two such electrodes (twin-carbon arc). The single-carbon and twin-carbon processes have gone out of fashion, at least in the United States, other processes having replaced them. Few welders today have experience with carbon arc's use in welding, brazing, or heating, although the process retains its utility for those who acquire the particular skills involved. Carbon arc welding is often confused with the widely-used arc-air gouging process, which is used for metal removal rather than metal joining. Arc-air employs a single carbon in a special handpiece that is supplied with electrical power and compressed air, and is used for removing flawed welds, gouging out cracks for welding, beveling the edges of plates, and other spot-removal problems. An arc is struck between the carbon and the metal to be removed; when the metal reaches a liquid state, the operator triggers a jet of compressed air which blows out the liquid metal. It should be noted that this action differs in principle from gouging, beveling, and cutting of steel as done by oxygen/acetylene and oxygen/propane torches. In that process, the steel is heated with a flame, but not to the liquid state; instead an oxygen jet is triggered which makes an exothermic reaction with free ferrite in the steel, liquifying it and blowing it out of the base metal. Single-carbon arc welding, brazing, and heating utilizes a direct-current (DC) power source, usually connected with the electrode negative ("straight polarity"). The process was thought to have particular merit in welding galvanized sheetmetal, having a relatively concentrated heat which minimized distortion of the metal. The single-carbon handpiece was designed to withstand considerably higher electrode temperatures than do common arc welding handpieces designed for coated "stick" welding electrodes, and some industrial versions were water-cooled. A significant problem with single-carbon welding was the likelihood of the weld puddle being contaminated by bits of carbon from the electrode. Carbon contamination is much less likely with twin-carbon arc. Twin-carbon arc handpieces are unlike any other welding handpieces (often loosely referred to as "torches"). These have two arms which affix the twin electrodes, or carbons, at a range of angles to each other, and which are manipulated by the operator to vary the distance between the tips of the electrodes, or "gap," this usually being done while the work is in progress. Welding electricity usually and preferably is from an alternating-current (AC) power source. Holding the handpiece, the operator manipulates the moving arms to touch the electrode tips together momentarily to initiate current flow, then moves them apart to achieve the desired gap. The resultant electric arc across the gap serves as a heat source to bring the workpiece to a temperature at which welding or brazing filler rod can be added. The electrodes for either carbon arc process were made of baked carbon or pure graphite in a tubular copper jacket. The electrodes, often called "carbons," are not intended to be consumed as a part of the process, although they gradually erode and must be replaced. Welding carbons were commonly 6" long and ranged in diameter from 3/16" to 1/2". The arc temperature was in the area of 5000C/9000F degrees, emitting an extremely bright light which in earlier times found use in street and stage lighting, in searchlights and lighthouses, and a little later in photo-engraving and movie theater projection equipment. The brightness of this arc calls for the protection of a welding helmet with a minimum darkness rating of #12, with #14 recommended, and protective clothing is essential to protect the skin from the intense ultra-violet radiation of the arc. Carbon electrodes for arc-air gouging are readily available, and those for old theater projectors are still manufactured, but the current availability of new welding carbons is unclear. Both the single and twin-carbon arc processes were first patented in Europe and the United States at the end of the 19th century, and achieved widespread use in the first three decades of the 20th century. Advances in the shielded metal arc welding process (abbreviated SMAW and often referred to as "stick" welding) during the second world war, particularly to the coating materials on the consumable electrodes, made it a superior process for nearly every application. SMAW quickly became popularly synonymous with arc welding and remained so for many years, and completely replaced carbon arc. Today, in the United States, the UK, And Australia, carbon arc joining as an industrial process exists only in a very few highly specialized and automated applications. The special handpieces for carbon arc welding appear to have gone out of production, at least in the United States. The few current users of such equipment tend to employ the carbon arc most often for heating metal for bending and forming, sometimes for brazing, and often for heating purposes such as thawing frozen water pipes. It could also be used for melting lead and babbit, and even the hard-surfacing of digging and earthmoving equipment, using a special hardfacing paste. The twin-carbon arc torch in particular was often offered as an accessory with small AC transformer welders sold to amateur welders and farmers, serving some of the same purposes as an oxy-acetylene gas welding outfit which would have cost these occasional users hundreds of dollars more. --Philip H. Smith, Jr.

Use the information you have to find it. -- divide the length of the arc by the total circumference of the circle, or -- divide the central angle of the arc by 360 degrees (a full circle)

The Arc Lamp is the first commercially successful form of electric lamp. It changed the world of lighting by setting the trend on carbon electric lights.

Contradiction in terms. If its "non-fusion" then it isn't welding. You probably mean brazing.

The answer will depend on what other information is given.

The reflex arc includes the sensory neuron (sensory intake) to the motor neuron (motor response). This two neuron arc is the fastest. Many times an interneuron at the level of the spinal cord is involved. It passes information to the brain more slowly. It is like an "incident report".

According to some sources, she had a sister, older named Catherine D"arc who was NOT a Girl Knight. One has very little information on her life span.

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