While Telford was working busily upon his wonderful canal, he hadmany other schemes to carry out of hardly less importance, inconnection with his appointment as county surveyor. His prettyiron bridge across the Severn at Buildwas was another applicationof his favourite metal to the needs of the recent world that wasgradually growing up in industrial England; and so satisfied was hewith the result of his experiment (for though not absolutely thefirst, it was one of the first iron bridges ever built) that heproposed another magnificent idea, which unfortunately was nevercarried into execution. 0ld London Bridge had begun to get atrifle shaky; and instead of rebuilding it, Telford wished to spanthe whole river by a single iron arch, whose splendid dimensionswould have formed one of the most remarkable engineering triumphsever invented. The scheme, for some good reason, doubtless, wasnot adopted; but it is impossible to look at Telford's granddrawing of the proposed bridge--a single bold arch, curving acrossthe Thames from side to side, with the dome of St. Paul's risingmajestically far above it--without a feeling of regret that such anoble piece of theoretical architecture was never realized inactual fact.