Electrical news and engineering . rent had to traverse the wlujle length of the carbon beforereaching the charge in the furnace. Now, however, theconnection is made by a water cooled copper ring whichgrijis the electrode just above the point where it enters theroof. In this way the distance which the current has totravel is always at a minimum, and not only is the lengthof carbon traversed by the current a great deal shorter,Init its temperature is higher and consequently its resistanceconsiderably less than that of the cold electrode. It will be remembered that the gas produced by the r
Electrical news and engineering . rent had to traverse the wlujle length of the carbon beforereaching the charge in the furnace. Now, however, theconnection is made by a water cooled copper ring whichgrijis the electrode just above the point where it enters theroof. In this way the distance which the current has totravel is always at a minimum, and not only is the lengthof carbon traversed by the current a great deal shorter,Init its temperature is higher and consequently its resistanceconsiderably less than that of the cold electrode. It will be remembered that the gas produced by the re-duction of the charge was taken and, after passing through. in the fact that an improved method of connecting thecopper cables carrying the current, with the electrode, canbe adopted. The old arrangement was to make this con-nection at the upper end of the electrode so that the cur- two dust catchers, was blown by means of a fan under theroof of the melting chamber, serving the double purpose ofcooling the roof and at the same time aiding in the re-duction of the descending charge during its passage up theshaft. Difficulties were however experienced in carrying outthis scheme, due to the dust contained in the gas. The dustcatchers installed were effective in catching the coarserdust particles, but allowed the very fine ones to pass throughwith the gas. On passing through the centrifugal fan thisfine dust was thrown to the outside of the fan casing, whereit accumulated and periodically choked the fan, so thatin spite of the introduction of a jet of water into the centreof the fan this deposit became so thick that the fan hadto be shut down ever
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidelectricalnewsen20donm
