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Holophane

Holophane Limited
Elverton Street
London, SW1 England

The firm exhibit three types of prismatic refractor at the 1928 APLE Conference in Sheffield. These are:
  • Bowl Refractors: Two-way non-axial bowl type for installation at the sides of the roadway; the two-way axial bowl type for central suspension; the three-way bowl type for "T" intersections; the four-way bowl type for four-way intersections; and the symmetrical bowl type for covering large areas.
  • Band Refractors: Gives a form of light distribution more suitable for spacing on wider thoroughfares. This form of refractor is generally fitted inside lanterns with clear glass bowls. A new band-type refractor has recently been designed giving a two-way directional distribution.
  • Dome Refractors: These are also for lanterns equipped with outer globes. It is not made with diffusing prisms, the necessary diffusing of the light rays being effected by the outer globe, which is made in rippled or frosted glass. Dome-type refractors are also being made with an asymmetric light distribution, so as to redirect the maximum amount of light away from the house line to the roadway proper.
  • Refractor Plates: A new and particularly interesting Holophane development in directional street lighting was the square-type gas lantern with four-light burners. These lanterns were fitted with special prismatic refracting plates of heat-resisting glass for street gas lighting, to control the light rays from the superheated burner and give a lateral direction to the light distribution. The prismatic plates are designed for use with square-type lanterns having single or multiple burners. They are easily adapted to existing lanterns, and when fitted, are readily detached and replaced for maintenance purposes. For ordinary street-lighting practice two prismatic plates are fitted in a lantern, each axial to the direction of the street.
In all these Holophane street refractors the prism surfaces are protected from the collection of dirt and dust. They have smooth surfaces both inside and out, and therefore can be very readily cleaned. The Illuminating Engineer, August 1928



The three main groups of prismatic refractor in 1932 are the Bowl, Dome and Band Refractors, and also a large ornamental type The light control is similar in each case with two members comprising the refractor which encases the prisms between them - therefore the exterior and interior glass of the refractor is smooth and easily cleaned. Bowl refractor types:

  • Symmetric - Circular distribution for open areas, squares etc.
  • Asymmetric - For positions along one side of a road with close spacing or a very wide road.
  • 2-Way Non-Axial - Staggered spacing along an average road.
  • 3-Way Non-Axial - For "T" junctions.
  • 4-Way Non-Axial - For normal crossings.
  • 2-way Axial - For central suspension between intersections.

Dome refractor types:

  • Symmetric - Circular distribution for open areas, squares etc.
  • Asymmetric - For positions along one side of a road with close spacing or a very wide road.
  • 2-Way Non-Axial - Staggered spacing along an average road.

Band refractor types:

  • Symmetric - Circular distribution for open areas, squares etc.
  • 2-Way Non-Axial - Staggered spacing along an average road.

Ornamental refractor types:

  • Symmetric - Circular distribution for open areas, squares etc.
  • Asymmetric - For positions along one side of a road with close spacing or a very wide road.

The two main types of lantern are the cast iron and spun copper type - APLE Exhibition Catalogue 1932



Holophane's stand at the 1936 APLE exhibition in Cheltenham.


At the APLE's 1936 conference in Cheltenham the firm are exhibiting a comprehensive range of street lighting equipment, the well-known Duo-Dome range of refractors for gas-filled lamps, the ornamental refractor and the Lennox Lantern which used a different type of ornamental refractor. - Public Lighting #3, 1936


In 1937, the firm have teamed up with Philips and various manufacturers to exhibit various lanterns fitted with their 780 Prismatic Panels for 150W SO/H lamps. The refractor gives very wide lateral light distribution without "glare" and with exceptional visibility. It is constructed in two pieces with the prisms formed internally so that both exposed surfaces are smooth. The Bowl Refractor Lantern 564/2/4114 is also being exhibited. - APLE Conference Programme 1937


The firm are exhibiting:

  • A new ARP Fitting for industrial yards and open spaces. It has a cut-off reflector with a special glass filter and an attachable reflector shield to prevent light distribution above the horizontal.
  • A new refractor lantern of special shape to be used with horizontal Mercury discharge lamps. (Probably the Cylinder Lantern of the next year.
  • A large ornamental bronze Street Light for 1000-1500W GLS lamps. It has a special three-piece internal refractor for the illumination of very wide thoroughfares.
  • The Bi-Way lanterns with three different types of light distribution.
  • The latest types of Holophane Sodium Refractors
  • A range of the well-known Duo-Domes.
Interestingly the firm also exhibited lanterns by various gas street lighting manufacturers which used their gas refractors. - APLE Conference Programme 1938


The new Cylinder Lantern is being exhibited in 1939 along with an improved Lineal and the Cut-Off, Bi-Way and Duo-Dome lanterns. - APLE Conference Programme 1939


A brief history of the firm is outlined along with general information about their street lighting department, formed to give service and information on every aspect of the subject, and to plan and explain the application of Holophane units.- APLE Conference Programme 1945



Holophanes' stand at the 1953 APLE exhibition in Liverpool.


References:
The Illuminating Engineer 1928
APLE Exhibition Catalogue Blackpool 1932
APLE Conference Programme Folkestone 1937
APLE Conference Programme Bournemouth 1938
APLE Conference Programme Glasgow 1939
APLE Conference Programme Glasgow 1945


External Links:
Grace's Guide