. The Street railway journal . ou can readily see for yourself is also borne out in the form of con-struction which is called the Zell conduit, in which we have a drainagetube in the center beneath the slot, and the wire is supported in twoseparate compartments, one on each side of the drainage tube. Bothof these systems, as I say, are suggestions. Here are some more suggestions, one of which is very similar tothe Bentley-Knight construction. Avery complete and well designedconduit is that devised by Elias Ries as far back as 1887. The other isan oddity. The wire is simply loosely supported on
. The Street railway journal . ou can readily see for yourself is also borne out in the form of con-struction which is called the Zell conduit, in which we have a drainagetube in the center beneath the slot, and the wire is supported in twoseparate compartments, one on each side of the drainage tube. Bothof these systems, as I say, are suggestions. Here are some more suggestions, one of which is very similar tothe Bentley-Knight construction. Avery complete and well designedconduit is that devised by Elias Ries as far back as 1887. The other isan oddity. The wire is simply loosely supported on insulators, and thetrolley wheels pass under the wire and raise it up as it comes along, andafter the collector has passed the wire drops back into its support. Now you will please take notice that most of these various formsof open slot conduit possess several points of disadvantage. In nearlyall the forms which have been tried the conduit has been extremelysmall; the wires have been unprotected and poorly located; they have. TWO FORMS OF VAN DEPOELES FLEXIBLE LIP CONDUIT. been placed low instead of high; the insulators have been poor andinaccessible, and the problem seems to have been attacked from thewrong standpoint, namely, to get a cheap system to compete with thetrolley. We will leave the open slot conduit for a while and take up whatwe call the movable lip or cover conduit. In this form of constructionthe aim has been to protect the wire, and in order to do that severalinventors have attempted to cover up the slot to keep the slush and muddirt out, except when the trolley is passing. One of the best knownof this kind is the Van Depoele conduit, and the invention of the latewell known electrician, Mr. Van Depoele. He devised a form of con- 774 THE STREET RAILWAY JOURNAL. [Vol. X. No. 12. struction having flexible lips, which cover the slot of the conduit con-taining the wire. The conduit is very small, and there are two lipswhich press together over the slot and which a
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