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    Sheeny Shepherd and Gordon Mackenzie worked at the P. L. Robertson Manufacturing Company, Milton

    P. L. Robertson (right) and his brother and P. L.'s house in Milton, Ontario

    For further information, see "P. L., inventor of the Robertson screw" by Ken Lamb.

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. The photographs are pasted into an album with the following inscription "To Stimulate The

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription "To Stimulate The memory of M

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription "To Stimulate The memory of M

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of