Journal . . 1 • • f • /? ^ Ml( SIIKWlXn KKl-WT OK , THE CORROSION AND RUSTING OF IRON. 243 strong currents, and corrosion of neighbourinf^ ironwork is prac-tically certain. To minimise the effect, the pipes or steel girdersmust be either (i.) sufficiently insulated from the wet soil by meansof a protective coating or insertion in dry cement or brickwork, or(ii.) connected to the rails at frequent intervals, thus causing thewhole network to be at one potential. The following table shows the permissible loss of voltage onthe tram rails in some large European cities {Engi
Journal . . 1 • • f • /? ^ Ml( SIIKWlXn KKl-WT OK , THE CORROSION AND RUSTING OF IRON. 243 strong currents, and corrosion of neighbourinf^ ironwork is prac-tically certain. To minimise the effect, the pipes or steel girdersmust be either (i.) sufficiently insulated from the wet soil by meansof a protective coating or insertion in dry cement or brickwork, or(ii.) connected to the rails at frequent intervals, thus causing thewhole network to be at one potential. The following table shows the permissible loss of voltage onthe tram rails in some large European cities {Engineering Record,1909) : — Town. Permissible potential loss on return circuit. Potential observed between rails and pipes laifl near. London . Paris Berlin Vienna St. Petersburg . Moscow . Glasgow . Liverpool . Christiana. ? 1 per kilometre 5No regulations 5-7 1 • 5 in towns 3 in suburbs 7 7 10 —4-27 1 45 5 Other cases where externally supplied currents cause corrosionare to be found at
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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
