The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 357
is eccentric to the disc -J^thof an inch, and conseciuently one point in the periphery of the disctouches the inner edge of the brass margin, with which the top ofthe disc is level. To the under side of the brass plate a small slideis fitted, to the outer end of which a piece of steel is attaclied… … notch in the brass margin, and is secured to the brass plate byscrews. The inner edge of the sliding jaw is rounded to a radiusof ^inch, and is kept in contact with the periphery of the eccen-tric disc by a spring (under the disc), which acts against a stud inthe slide projecting through the brass…
Architecture · Civil engineering · Science
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