The data discovered might lead the way for supersonic commercial flights without sonic booms, the company said in the news ...

The light from this lamp was picked up by another photo-electric cell, which in turn actuated the switches controlling the mercury vapour lamps flood-light ing the hall of the Museum.

2.4-amp., high-pressure quartz mercury vapour lamp kept parallel to the layer of zinc oxide powder on the quartz frit at a distance of 5 cm. the photocatalytic oxidation of methyl alcohol could ...