This catalogue, dating from July 1935, differs remarkably from similar catalogues from several years earlier. The
introduction of the first discharge lamp, the medium-pressure OSIRA (MA), has seen a revolution in street lighting, with
the catalogue filled with (mostly) new designs.
Among these new lanterns is the Di-Fractor. This catalogue introduces the first version of the lantern, which has a narrow
canopy, inspired by the profile of the Wembley. This design would be short lived as the lantern would undergo redesign
through the rest of the decade.
Lengthy notes are also given about the OSIRA lamp itself as many lighting engineers would've been unfamiliar with the requirements
for these lamps for ancillary equipment and how to specify wiring for them.