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THE BI-MULTI SYSTEM
of
STREET LIGHTING

GROUP "AL" SINGLE LAMP
for
40-200 Watt
Filament Lamps


Three Way (195^o 82½^o 82½^o)	Four Way (110^o 90^o 70^o 90^o)

GROUP "AL" SINGLE LAMP

BI-MULTI REFLECTORS
40 - 200 Watt
LAMPS

Suitable for side streets and rural
main roads of moderate traffic density

(Registered No. 736776 Patent No. 228294)

THE FOUNDRY
CANTERBURY, KENT

Telegrams:
ESLA, 17 Canterbury
Telphone:
Canterbury 17

general construction

The reflectors consist of one piece castings glazed with silvered glass facets, cut from flat sheet, embedded in a special atmospheric resisting cement. Each facet is set at the exact angle and is of a calculated size to produce the desired light distribution.

Material: Cast iron or Aluminium non-corrosive alloy.
Finish: Green or Aluminium. Other colours to order.
Tapping: ¾" gas thread as standard. Tappings to 1¼" to order.
Lamp Holders: Bayonet Cap or Edison screw. Anti-vibration B.C. type as standard. Rigid Edision Screw or rigid Bayonet Cap when specified.

approximate dimensions and weights

Type	Approx Dimensions			Approx Weight
Type	Length	Width	Height	Cast Iron	Aluminium
Two Way	12¼"	11¼"	10½"	11½ lbs	5 lbs
Three Way	11¼"	11¼"	10½"	10½ lbs	4½ lbs
Four Way	11¼"	11¼"	8½"	10½ lbs	4½ lbs

technical description

The reflectors are designed to produce a light distribution of the required characteristics to ensure good uniformity of illumination and road brightness. The peak candle power is projected at an angle of 10^o below the horizontal.

The recommended average economical spacing of posts is ten times the mounting height of the lamp filament.

Type of lamp. B.S.I. type clear gas filled singled coil tungsten filament lamps for standard use. Where the reflectors are installed under aderse circumstances as regards mounting height etc., pearl lamps should be used as explained later. Also, where coiled coil lamps are employed, these should always be of the pearl type unless the mounting height is more than 17'.

mounting height

The table below gives the suggested mounting heights for various wattages. Where the mounting height is less than these values, it is advisable to either use a pearl lamp or one of the numerous grades of semi-diffusing silvered glass instead of the clear mirror glass. Reflectors glazed with different grades of this glass may be loaned for trial purposes and the grade best suited to the conditions can then be chosen.

Wattage	40	60	75	100	150	200
Recommended minium Height to Light centre.	14'	14'	15'	15'	16'	17'-20'

angular settings

The Bi-Multi method of street lighting constitutes a complete system, the reflectors being available in an extremely wide variety of angular settings, which are constantly being added to. We can therefore guarantee to provide a reflector producing the correct distribution of light for every position in a scheme, irrespective of road bends, intersections, varying spacings, road widths etc.

The table below indicates the present range of angular settings, but we make a regular practice of designing special patterns whenever we find unusual positions.

The angles are read in a clockwise direction looking down on the fitting. It must be remembered that the angle of the reflector does not follow the angle of the road. For instance, in the case of a straight road with side of road mounting, 180^o reflector is not required, the correct one being usually 165^o or 170^o. (i.e. ensuring that a minimum of light is wasted on the boundaries of the road.) Another example is an exact 90^o sharp bend; here either a 100^o or an 80^o fitting will be necessary according to whether the post is on the inside or outside of the bend. The general lines of procedure are described in the introductory matter of our general catalogues.

technical service

The personal services of our technical staff at the works are at our clients' disposal at all times. They are prepared to visit a district in order to advise on all street lighting problems, also to inspect every individual lighting position to ascertain the correct reflector, or this latter work can be done reasonably well from plans.

They are also ready to carry out photometric tests on site, for which purpose they are equipped with the latest portable photometers available.

schedule of angles

Two Way	Three Way	Four Way
180^o 175^o 170^o 165^o 160^o 155^o 150^o 140^o 135^o 130^o 120^o 110^o 100^o 90^o 80^o 40^o	120^o 120^o 120^o 130^o 130^o 100^o 130^o 110^o 120^o 135^o 135^o 90^o 135^o 112½^o 112½^o 140^o 140^o 80^o 140^o 130^o 90^o 140^o 120^o 100^o 140^o 100^o 120^o 150^o 140^o 70^o 150^o 130^o 80^o 150^o 120^o 90^o 150^o 95^o 115^o 150^o 80^o 130^o 150^o 70^o 140^o 155^o 150^o 55^o 155^o 135^o 70^o 155^o 115^o 90^o 155^o 102½^o 102½^o 155^o 90^o 115^o 155^o 80^o 125^o 155^o 55^o 150^o 160^o 155^o 45^o 160^o 120^o 80^o 160^o 105^o 95^o 160^o 90^o 110^o 160^o 80^o 120^o 160^o 70^o 130^o 160^o 60^o 140^o 165^o 165^o 30^o 165^o 145^o 50^o 165^o 140^o 55^o 165^o 125^o 70^o 165^o 115^o 80^o 165^o 112½^o 82½^o 165^o 105^o 90^o 165^o 97½^o 97½^o 165^o 95^o 100^o 165^o 90^o 105^o 165^o 82½^o 112½^o 165^o 77½^o 117½^o 165^o 60^o 135^o 165^o 45^o 150^o 165^o 35^o 160^o 170^o 145^o 45^o 170^o 100^o 90^o 170^o 95^o 95^o 170^o 75^o 115^o 175^o 115^o 70^o 175^o 45^o 140^o 180^o 125^o 55^o 180^o 120^o 60^o 180^o 110^o 70^o 180^o 100^o 80^o 180^o 95^o 85^o 180^o 90^o 90^o 180^o 80^o 100^o 180^o 70^o 110^o 180^o 65^o 115^o 180^o 55^o 125^o 180^o 30^o 150^o 185^o 145^o 30^o 185^o 80^o 95^o 190^o 95^o 75^o 190^o 90^o 80^o 190^o 85^o 85^o 190^o 75^o 95^o 190^o 70^o 100^o 190^o 55^o 115^o 190^o 40^o 130^o 195^o 130^o 35^o 195^o 115^o 50^o 195^o 100^o 65^o 195^o 82½^o 82½^o 195^o 75^o 90^o 195^o 55^o 110^o 195^o 40^o 125^o 200^o 135^o 25^o 200^o 100^o 60^o 200^o 80^o 80^o 200^o 70^o 90^o 200^o 60^o 100^o 205^o 90^o 65^o 205^o 77½^o 77½^o 210^o 50^o 100^o 215^o 90^o 55^o 220^o 65^o 75^o 225^o 45^o 90^o 230^o 75^o 55^o	90^o 90^o 90^o 90^o 100^o 80^o 100^o 80^o 100^o 100^o 80^o 80^o 105^o 50^o 102½^o 102½^o 105^o 80^o 85^o 90^o 105^o 90^o 65^o 100^o 105^o 90^o 75^o 90^o 110^o 70^o 90^o 90^o 110^o 80^o 80^o 90^o 110^o 90^o 70^o 90^o 120^o 40^o 105^o 95^o 120^o 80^o 70^o 90^o 120^o 100^o 90^o 50^o 120^o 105^o 40^o 95^o 121^o 73^o 100^o 66^o 125^o 50^o 105^o 80^o 125^o 70^o 90^o 75^o 125^o 90^o 80^o 65^o 130^o 35^o 125^o 70^o 135^o 65^o 95^o 65^o 140^o 70^o 55^o 95^o 145^o 40^o 120^o 55^o 145^o 55^o 75^o 85^o 145^o 65^o 70^o 80^o 145^o 75^o 85^o 55^o 165^o 15^o 155^o 25^o

GROUP "AL" SINGLE LAMP

BI-MULTI REFLECTORS 40 - 200 Watt LAMPS

Suitable for side streets and rural main roads of moderate traffic density

(Registered No. 736776 Patent No. 228294)

BI-MULTI REFLECTORS
40 - 200 Watt
LAMPS

Suitable for side streets and rural
main roads of moderate traffic density