“Electric arc welding.”

Mr. President and Gentlemen, As there is a little more time available, I think it would be useful to show, through the epidiascope, a few illustrations showing the application of apparatus giving an alternating current arc. The first illustration shows a stationary type transformer welding plant for one operator, rated 12 kVA continuous or 16 kVA for one hour (the recognised time rating for welding units). This gives a welding capacity of 200 amps, when the secondary winding is arranged to give 80 volts on open circuit. To reduce the voltage immediately after striking the are, an adjustable reactance coil is used. The core is arranged with graduations of current, and is set to suit the particular size electrode to be used.