...1851, only three thousand miles are actually in working order; so that three-fourths may be considered a failure and loss to the country. The insulators...substituted, but at present with no satisfactory result. All these difficulties, together with those connected with the coiling and paying out of the cable,...

...advantages, and, next to it, Wray's compound and pure gutta percha far surpass the commercial gutta percha hitherto employed ; but it remains to be seen whether...materials can be successfully overcome. The external projecting covering is still a subject of anxious consideration. The objections to iron wire are its...

...advantages, and, next to it, Wray's compound and pure gutta percha far surpass the commercial gutta percha hitherto employed, but it remains to be seen whether...materials can be successfully overcome. The external projecting covering is still a subject of anxious consideration. The objections to iron wiro are its...

...advantages, and, next to it, Wray's compound and pure gutta percha far surpass the commercial gutta percha hitherto employed, but it remains to be seen whether...materials can be successfully overcome. The external projecting covering is still a subject of anxious consideration. The objections to iron wire are its...