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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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โˆ™ 2011-09-13 16:11:12
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Q: What is information on antique carbon arc projectors?
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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.

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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.

What is an arc lamp used to accomplish?

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.

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

The electrode holder used for shielded metal-arc welding may not be used carbon arc welding?

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.

How does a Carbon Arc Torch work?

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.

Where can a person buy carbons for a vintage twin-carbon arc torch?

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.

Does arcing cause melting?

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.


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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.