Z.8135B. Top entry with non-levelling body.
Sectional scale drawing of Z.8138 non-levelling side entry difractor.
The iso-candle is based on an average lamp light output through life from a 250 watt
OSRAM H.P.M.V. lamp. (7,250 lumens).
| 250 w. | 400 w. |
| Directional intensity ratio | 2.8 | 2.7 |
| Light above horizontal | 15% | 15% |
| Light output ratio | 70% to 75% |
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UNIVERAL
"DIFRACTOR" LANTERN
Z.8138B Side entry with non-levelling body.
|
Universal "Difractor" Lantern.
SPECIFICATION
Catalogue Nos. Z.8134/5/7/8B.
(British Patent Nos. 408419)
Use
Main road lighting; 25 ft. mounting height; spacing 120-150 ft; road width up to 40 ft.
| Lamp |
Z.8134/5B |
For use with a 250 W. or 400 W. OSRAM H.P.M.V. lamp, alternatively a 125 W. or 400 W.
OSRAM H.P.M.V. fluorescent lamp
|
| Z.8137/8B |
| Mounting |
Z.8134B. | Top entry, standard tapping 1 in. gas, requires 1 in. of threaded nipple. Levelling top. |
| Z.8135B. | Top entry, standard tapping 1 in. gas, requires 1 in. of threaded nipple. |
| Z.8137B. | Side entry, requiring 3 in. of unthreaded horizontal gas barrrel. Levelling top. |
| Z.8138B. | Side entry, requiring 3 in. of unthreaded horizontal gas barrrel. |
| Alternative tappings for ¾ in. to 1½ gas are available for Z.8134 and Z.8135 lanterns. Locking is by
a 7/16 in. Allen type grub screw. |
Levelling Top
A levelling top on the ball and socket principle is provided on the Z.8134 and Z.8137 body. This enables small variations from
the vertical of the lantern to be corrected.
Lantern Body
Die-cast light alloy. The body consists of a main bell-shaped casting containing the focusing gear and lampholder. On the top of the
body a small "umbrella" shaped casting protects the weathered cable entry and porcelain terminal block from water-drip. This "umbrella"
and the terminal block are enclosed by a hinged cap which is secured by two fixing bolts to the main body. Two toggle action
catches, one of which acts as a hinge, support the outer over-reflector which holds the bowl refractor. An earthing screw is provided.
Lampholder
G.E.S. porcleain holder wired to the terminal block with heat-resisting wire. An anti-vibration mounting can be provided.
Focusing
The lampholder is mounted on a bridge which is carried on two vertical pillars. A spring-loaded catch ensures that the bridge is
locked into the correct focal position for the type of lamp in use.
Optical System
The refractor is made in one piece of heat-resisting glass and is a Z.6610 non-axial asymmetric bowl refractor. It has
vertical curved prisms and deep flutes on the interior surface to provide light control. The exterior of the bowl is smooth except
for some prisms on the base. A white enamelled inner reflector is held in place by an expanding spring ring. Constriction of this ring
releases the reflector, giving access for focusing and maintenace.
Weathering Finish The alloy used is specially selected for its resistance to
corrosion. Further protection is obtaiend by the use of a suitable primer, undercoat and glossy aluminium top coat.
Erection Instructions Full erection and focusing instructions are packed with
each lantern.
APPROXIMATE EXPORT PACKING DETAILS (Standard Case)
LANTERN BODY
| 6 |
| cwt. | qr. | lb. |
| 0 | 3 | 12 |
| (43.5 Kgs) |
|
| cwt. | qr. | lb. |
| 1 | 2 | 18 |
| (84.3 Kgs) |
|
31.3 cu. ft.
(0.89 cu. metres)
|
|
GLASSWARE
| "B" Bowl |
12 |
| cwt. | qr. | lb. |
| 1 | 2 | 0 |
| (76.2 Kgs) |
|
| cwt. | qr. | lb. |
| 2 | 2 | 14 |
| (133.3 Kgs) |
|
23.3 cu. ft.
(0.66 cu. metres)
|
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