Patent plate glass
Maintaining traditional plain glass and glazing, published on 1 November 2007 by Historic Scotland, states: ‘…the process for producing Patent Plate glass was invented in 1839 by James Chance. Earlier types of plate glass required the initial sheet of glass to be very thick to allow for a portion of its surface to be ground away to make it flat. However, the Patent process enabled thinner sheets of glass to be ground and polished which meant that manufacturers could make more finished glass from the same amount of raw materials.’
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