Green Glass “Blackboards”
The latest blackboards, installed in schools in the United States, are made of glass—and are green. Education authorities selected this mod- ’ ern equipment because of its per'manence, velvety finish and nonglare writing surface. The writing surface of the glass blackboards is ground uniformly and treated to produce a surface of even, pleasant “feel,” on which chalk marks stand out in bold relief even when viewed from acute angles. By eliminating mirror-like glare, the velvet surface reduces eye-strain.
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https://paperspast.natlib.govt.nz/newspapers/BPB19480220.2.39
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Bay of Plenty Beacon, Volume 12, Issue 23, 20 February 1948, Page 8
Word count
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80Green Glass “Blackboards” Bay of Plenty Beacon, Volume 12, Issue 23, 20 February 1948, Page 8
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