Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 345
This illustration shows some characteristic B.T.H. Endirec Units. Now thuthe Hulf-watt lamp is coming into general use these fixtures are expected-o bewidely adopted. It will be observed that the white exterior surface of such lidoe much to remove the appearance of darkness when the fitting i- sen…
Lighting
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