Catalogue Number 15 from Holophane firstly explains the scientific principles and principles of
street lighting before listing the various types of refractor available. This gives an excellent insight into the thinking
behind street lighting in the 1920s which eventually lead to BS 307: Street Lighting in 1927.
Unfortunately the catalogue is undated, but given the emphasis given to
Scentific Street Lighting, the early range of refractors and
the lack of any standards, then it probably dates from the mid 1920s.
This catalogue is the property and copyright of Holophane Europe Ltd. Many thanks to
Holophane Europe Ltd for the scans and permission to reproduce it.