Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 367
Fig. 71.Section of TrevelyansRocker. Fig. 72.Trevelyans Rocker. away and a groove made in the small flat thus produced,see Fig. 71. When working this prism rests with itsgroove downwards on a block of lead with a rounded top.The end of the rocker is carried by a rod terminating in aball which rests…
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