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ilp archive : cheltenham 1936

Presidential Address

Edward C. Lennox, M.I.E.E.
(North-Eastern Electric Supply Co., Ltd., Newcastle-Upon-Tyne)


Keywords: APLE: Organisation, Lighting: Specifications, Statistics: Accident Data, Lighting: Authority Organisation, Lighting: Theory


Tuesday, September 8th, 1936


Abstract: Lennox splits his address into several main sections, each dealing with one of the varied aspects of the association's work over the previous year.

He describes changes within the organisation and the publication of Public Lighting and the Public Lighting Enginner as well as the forthcoming Education Scheme; the M.O.T. Interim Report is welcomed and it should obviate any delay on the part of Lighting Authorities waiting the Final Report; Lighing Engineers should use current press interest and promote new schemes; Road Accident Data (up to 1935) is analysed and the general conclusion is that if better visibility is provided during dark hours on heavy traffic routes and in built-up areas then the accident rate would decrease materially; the administraiton of lighting authorities, car headlights and the clarification of terms.


References:
[1] Public Lighting: Its Necessity and Administration, E. C. Lennox, A.M.I.E.E., Public Works, Roads and Transport Congress (1935).
[2] MOT Interim Report 1935




MOT Interim Report From A Layman's Point Of View

Alderman W. E. Wilford, J.P.
(Chairman, Watch Committee, Leicester)


Keywords: Lighting: Specifications, Lighting: Authority Organisation


Tuesday, September 8th, 1936


Abstract: Wilford agrees with practically the whole of the conclusions recommended in the Interim Report but concentrates almost solely on how continuous, uniform and efficient lighting on main traffic routes can be acheived through a reform of the present methods of administration.


References:
[1] MOT Interim Report 1935




Street Lighting Practice In The Netherlands

Professor Ir. G. B. v. d. Werfhorst
(University of Utrecht)


Keywords: Lighting: Authority Organisation, Lighting: Distribution, Lighting: Theory, Lighting: Luminaires, Lighting: Glare, Lighting: Levels, Lighting: Lamps, Lighting: Installations


Tuesday, September 8th, 1936


Abstract: Werfhorst describes the organisation of street lighting in Belgium and the rapid changes about to happen due to the new thinking about optical design and the number of new lamp types available.

He notes how "horizontal illumination" or "uniform distribution" theory has been discarded for "good brightness" and "no dazzle." Example luminaries are illustrated the "globe-band" and "screened concentrating reflector" - and their use in two different scenarios are described.

A major portion of the paper is devoted to analysing the effects of contrast under scotopic and photopic lighting conditions for mercury, sodium and white light. He develops the concept of "apparent brightness" and "richness in contrast" to support the use of sodium for arterial roads under low lighting conditions. The theory rests upon the idea that portions of the field-of-view are viewed photopically and others scotopically at the same time.

The introduction of the new high-pressure mercury lamp is described along with an example installation.


Luminaires: Philips Philulex N.A., Philips Philulex N.D.


References:
[1] Modern Street Lighting, C. C. Paterson, J.I.E. Journal, January 1935.
[2] De Ingenieur, Bouma, BD 290-294, 1934.
[3] Light Und Lampe, Konig, 23, 131, 1934.
[4] Lecture, Dr. Jhr. v. Lennep, Utrecht, February 1936.
[5] The Importance Of Kinematical Factors Of Roadway Illumination, L. J. Davis, M.A., B.Sc.; R. Maxted, B.E. (Elect.), B.E. (Mech.); G. S. Lucas, M.I.E.E., APLE, 1935