edit

Hello fellow Wikipedians,

I have just modified 2 external links on Peter W. Barlow. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 11:57, 10 December 2017 (UTC)Reply

Barlow-Greathead-Beach shield design controversy

edit

W. C. Copperthwaite was Greathead's pupil and wrote a definitive exposition on each of the above named engineers' contributions to tunnelling shield design published in 1906 at New York. A copy of which is available from the Institution of Civil Engineers in London.

A long controversy has raged over who invented the cylindrical shield since 1869, making it a bicentennial-long conjecture. It is flat that Barlow came up with the idea first but never built it. Whilst it has been proven that Greathead designed, patented and built the first cylindrical tunnelling shield, it was not of Barlow's design or input. This became clear to me on 10 July 2018 when I spoke to the librarian at the institution of Civil Engineers in London who clarified the facts according to the minutes of a meeting of the engineers on 19 November 1895 in which the chairman asked Greathead of he was aware that the late Barlow had had a provisional patent that closely resembled Greathead's patented idea. It turned out that Greathead had no idea of the 1868 provisional patent or of the 1864 patent of his school master. I have a substantial collection of notes and the minutes of that meeting which I am collating. Hopefully ICE will allow this copyright material to be partially shown to clarify the evidence of who built the first cylindrical shield. Simultaneously, Alfred Ely Beach designed a shield of his own and built it in New York around the same time as Greathead built his in London. Beach's design was very similar to Barlow's 1864 patent. For historical accuracy, there was never a Barlow-Greathead shield since they came up with their own patents meaning differently designed enough to warrant not being the same. Ashattock (talk) 01:08, 11 July 2018 (UTC)Reply