collision "type bar"2

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http://books.google.com/books?lr=&hl=ja&as_brr=0&q=%22collision+in+rapid+work%22&btnG=%E6%9B%B8%E7%B1%8D%E3%81%AE%E6%A4%9C%E7%B4%A2&as_drrb_is=b&as_minm_is=1&as_miny_is=1865&as_maxm_is=12&as_maxy_is=1892

They consist: First, in the manner in which the type-bar is jointed or hung, and in its mode of connection with the key-lever. In the Remington machine the type- bar is hung from a "trunnion-like bearing.
An increase in the number of type-bars consequently involves a longer type-bar, and, with equal solidity, a correspondingly greater weight, with greater liability of collision in rapid work.

The characters are all on a single solid piece of metal called a " type sleeve," instead of on separate type bars, so that no collision is possible.

avoids the difficulty and inconvenience experienced with typewriting machines of the type-bar class, when two keys are struck simultaneously.
With the Hammond printing form there cannot be a collision between the types , whilst in machines of the class above-named, if two keys are struck

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