Note 8 — Chapter IX · THE LOCK CONTROVERSY: DURING AND SINCE THE TIME OF THE GREAT EXHIBITION.

We believe the method was first made publicly known at a special general meeting of the members of the Institution of Mechanical Engineers, held at the rooms of the Society of Arts, London, on the 30th June, 1851, when a paper was read by Mr. Paul R. Hodge “On the progress of improvements in locks in the United States of America.” A report of this paper, together with the discussion thereon, was published by Waterlow and Sons, London Wall, 1851. Plate 34 (figs. 9 and 10) of this report contains representations of the lock-picking apparatus, from which we have copied our figures.