(From "Stage Lighting", 1975)

Beam Spread
Patt 264 Bifocal: Cut-off 17° max. ½ peak angle 17° 3m spread at 10m throw

Lamphouse
Steel pressings, bottom-hinged gate.

Fork
Mild steel, reversible, with friction disc tilt clamp and 3/8" Whitworth bolt and wingnut.

Lampholder
P28 medium prefocus, porcelain body, pretilted 30° from the vertical, fitted with 1m external length of 3-conductor sheathed cable.

Reflector
160mm diameter faceted ellipsoidal.

Gate assembly
Four hard-edge and four soft-edge shutters and gate runners.

Lens
150mm diameter plano-convex

Colour Frame
Double die-cast runners fitted to die-cast lens front, with 165mm square metal frame.

Lamps
1000W max. P.28 base up. 89mm l.c.l. Class T/4 recommended for stage use.

Accessories
12-leaf iris diaphragm, 2362504
Colour change wheel, 2341095
Additional metal colour frame, 2766107

(From "Bi-Focal Spots", 1968)

This spotlight is the only modern general-purpose unit for creative lighting as it embodies the beam characteristics of both the Profile and Fresnel spotlights in one compact unit.

It provides accurate control of beam shape with hard-edge cut-off on any one or more sides of the beam with indeterminate soft-edges on the remaining sides.

It projects an image of the gate aperture which has two sets of four built-in masking shutters - one set, in focus, for hard edges and another alternative set, out of focus, for soft edges.

Two lens combinations are available so that the most efficient use can be made of the light collected at the gate by an ellipsoidal reflector.