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THE BI-MULTI SYSTEM
of
STREET LIGHTING

GROUP "B" SINGLE LAMP
for
200 - 1000 Watt
Filament Lamps

Two Way
(165^o)


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

GROUP "B" SINGLE LAMP

BI-MULTI REFLECTORS
20 - 1000 Watts
LAMPS

Suitable for main and important
secondary roads of all kinds

(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: 1" gas thread as standard. Tappings to ¾" to 1½" to order.
Lamp Holders: Rigid Edison screw.

approximate dimensions and weights

Type	Approx Dimensions			Approx Weight
Type	Length	Width	Height	Cast Iron	Aluminium
Two Way	17"	14½"	15"	31½ lbs	14½ lbs
Three Way	17"	16½"	15"	31½ lbs	14½ lbs
Four Way	16"	16"	13½"	33½ lbs	16½ 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 12½^o below the horizontal.

The recommended average economical spacing of posts is six to 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 may be used as explained later.

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	200	300	500	1000
Recommended minium Height to Light centre.	17'-25'	20'-25'	25' and over	25' and over

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 130^o 120^o 110^o 105^o 100^o 90^o 80^o	130^o 110^o 120^o 140^o 130^o 90^o 140^o 100^o 120^o 140^o 90^o 130^o 145^o 120^o 95^o 150^o 140^o 70^o 150^o 90^o 120^o 155^o 102½^o 102½^o 155^o 90^o 115^o 155^o 80^o 125^o 155^o 65^o 140^o 160^o 100^o 100^o 160^o 90^o 100^o 160^o 60^o 140^o 165^o 145^o 50^o 165^o 140^o 55^o 165^o 112½^o 82½^o 165^o 100^o 95^o 165^o 97½^o 97½^o 165^o 82½^o 112½^o 170^o 95^o 75^o 170^o 80^o 110^o 170^o 40^o 150^o 175^o 140^o 45^o 180^o 100^o 80^o 180^o 95^o 85^o 180^o 90^o 90^o 180^o 85^o 95^o 180^o 80^o 100^o 180^o 75^o 105^o 180^o 65^o 115^o 180^o 50^o 130^o 190^o 95^o 75^o 190^o 85^o 85^o 190^o 80^o 90^o 190^o 75^o 95^o 195^o 115^o 50^o 195^o 100^o 65^o 195^o 88^o 77^o 195^o 82½^o 82½^o 195^o 75^o 90^o 195^o 65^o 100^o 200^o 100^o 60^o 205^o 77½^o 77½^o 210^o 108^o 42^o 210^o 65^o 85^o 210^o 60^o 90^o 215^o 72½^o 72½^o 240^o 60^o 60^o	90^o 90^o 90^o 90^o 100^o 80^o 100^o 80^o 100^o 95^o 82½^o 82½^o 100^o 100^o 65^o 95^o 110^o 85^o 65^o 100^o 110^o 90^o 70^o 90^o 115^o 100^o 65^o 80^o 115^o 85^o 105^o 55^o 120^o 80^o 70^o 90^o 120^o 85^o 77½^o 77½^o 135^o 65^o 95^o 65^o 140^o 75^o 65^o 80^o 140^o 80^o 55^o 85^o 165^o 45^o 50^o 100^o 174^o 77^o 77^o 32^o

GROUP "B" SINGLE LAMP

BI-MULTI REFLECTORS 20 - 1000 Watts LAMPS

Suitable for main and important secondary roads of all kinds

(Patent No. 228294)

BI-MULTI REFLECTORS
20 - 1000 Watts
LAMPS

Suitable for main and important
secondary roads of all kinds