Little Figures
ECENTLY there has been developed a method of finishing surfaces to a much higher degree of smoothness and accuracy than before. It is also claimed that the surface thus produced is harder and more resistant to wear. Such a surface is said to be super- ' finished. A surface which could commonly ‘be regarded as dead smooth actually contains innumerable. minute hills and hollows having a height or depth of many millionths of an inch. To-day we can measure these heights and depths from the true mean plane of the surface. If the surface is finished by the general method of grinding, the variations measure between 1 and 2 micro-inches, a microinch being one millionth patt of an inch. Ii the surface is super-finished by the new method the hills are removed and only a few small valleys of from 1 to 5 micro-inches remain.-= (" Engineering," Cecil Dawson, lecturer at Auckland University College, 1YA, August 14.) -_--- --
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https://paperspast.natlib.govt.nz/periodicals/NZLIST19410905.2.14
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New Zealand Listener, Volume 5, Issue 115, 5 September 1941, Page 5
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157Little Figures New Zealand Listener, Volume 5, Issue 115, 5 September 1941, Page 5
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Copyright in the work University Entrance by Janet Frame (credited as J.F., 22 March 1946, page 18), is owned by the Janet Frame Literary Trust. The National Library has been granted permission to digitise this article and make it available online as part of this digitised version of the New Zealand Listener. You can search, browse, and print this article for research and personal study only. Permission must be obtained from the Janet Frame Literary Trust for any other use.
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