process takes about two minutes.'I'hc dimensions of the ~~-pIilt<' arc 5 x .+x : in.Above ancl on each side ( i f the plate is a brass strip with a groove to forrn guir1c.sfor the r i i o w " n t of the plate-carrier.A channc.1 is cut along thc length of the wetlg:r-plate t o allow for t h e movement of t h e
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J W Sharpe (1949) studied this question.