SCHOOL SLATES.
SCIENTIFIC INVESTIGATION. • By Cable—Press Association —Copyright Received 25, 5.40 p.m. Berlin, March 21. Tests are being made, and as a result it is alleged thai a prejudicial effect on the eyesight is caused by black slates and white pencils in schools. A slate hag been invented with a dull white surface, requiring a black crayon pencil.
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https://paperspast.natlib.govt.nz/newspapers/TDN19140326.2.42
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Taranaki Daily News, Volume LVI, Issue 255, 26 March 1914, Page 5
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58SCHOOL SLATES. Taranaki Daily News, Volume LVI, Issue 255, 26 March 1914, Page 5
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