Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 215
from a gelatine mould castfrom a plaster of Paris model. For indoorwork, however, it may suffice to work witha plaster of Paris or wood shape direct,thus saving expense. The embedding ofthe mirrors must be done with specialcare with a view to avoiding any possibleprejudicial effect of the entry of… … Showing method of applying Luminor Mirrors in awarning sign for motorists. disc which may show signs of wear.Apart from their ordinary use as signsfor the purpose of giving informationor warning, or acting as advertisements,the mirrors may have other special uses,e.g., as an adjunct in theatrical…
Lighting
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