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Wicksteed had completed the statement of his want, Mr. Nasmyth had drawn upon the back of an old letter a rough sketch of the first double-faced sluice-cock; and in less than an hour had converted this rough sketch into a full-sized working drawing; in the preparation of which it fell to Mr. Marten's lot to have the honour to assist. In his 'Autobiography' Mr.
Nasmyth referred to the conversation with Mr. Wicksteed, and introduced a print of the drawing made upon the occasion. The invention has been of the greatest use to the Waterworks Engineer, especially in connection with the constant supply system, in which it frequently happened that the pressure was sometimes against one face of the sluice-cock, and sometimes against the other."
Wicksteed explained to Mr. Nasmyth the want he had experienced of a sluice-cock for Waterworks purposes, which should shut and remain perfectly tight against a pressure coming from either side. Mr. Marten had a lively recollection of the instantaneous rapidity with which Mr. Nasmyth not only grasped but provided for the requirement; so that almost by the time Mr.
The great improvement originated with the introduction of 'the double-faced sluice-cock. This sluice-cock, which had now superseded every other description, was the creation of Mr. James Nasmyth's inventive genius. Mr. Marten said he well remembered the first reception of this useful invention, as he happened at that time to be a pupil of Mr. Thomas Wicksteed. He was present when Mr.
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