Theatre Design & Technology - May 1966 - 30

'lard Leonard
Preset cord mounting frame;

6.1.3.

Word

facturers,

Leonard,

has

Front view with the card extracted

like many stagelighting control manu-

developed

preset

cord

system

for

infinite

variation of sets of cues. The accompanying photographs provide
a

relatively

lationships

complete

sequence

views,

clarifying

the

re-

of component functions in the preset card for such

Preset card mounting f,ame; rear view (Lob sample)

The
accompanying
illustration
reveals
the
tube
enclosed
within a conventional gloss envelope, as well as the doublyfused links for circuit protection. Of central interest is the
lamp's claimed increase in life, particularly the increase of the

rated

lumen hours,

without any change in

the 3200" Kelvin

Extensions from the 30 wirewound potentiometers in

color temperature. Characteristics of these two lamps compared

each of these plastic cords (16" x 5 3/8") engage rhodium-

with the 400 watt and 1000 watt linear filament Quartzline are

coated, phosphor-bronze fingers to provide positive contacts.
This Insert, like other similar ones, allows modular combinations: at Stanford Ward Leonard is installing a console of ten

of Quartzline lamps has been consistently downward as volume

system.

shown below. It is of some comfort to note that the price trend
of use and manufacturing efficiency has improved.

scenes in a 60-dimmer system with a total of 80 cards.

06.1.3

Another development in halogen cycle lamps has been

announced

the

General

Electric

Lamp Co.

An improvement

of the 750 watt T24 lamp, employing bromine rather than iodine
gas, broadens the
design.

Quartzline

series to include planor filament

Order
Abbrev.

Q750T20/4CL 750T24/16 Q400T4/CL Ql000T6/CL

Initi 01
Lumens

20,500

7,500

21,000

200

2,000

Mean Lumens

19,700

through life
(CO initial)

(96CO)

17,400
(85"')

7,275
(97oo)

20,400
(97"".)

Rated lumen

3,940,000

870,000

14,550,000

40,800,000

3" dia.

3 1 '8"
length

5 7/8"
length

Approx.

5 '8"
length

1" length

$ 7 .50

$ 16.00

Life

hours
Outer

i acket

Light size

2'," dia.
Approx.
12 "

List price

square

$32.10

12 "

square

$ 7 .20

Claimed lamp characteristics of Four General
Electric Lamps

07 _'.3

significant

turning

point

the

field

acoustics

has been carefully explained by Harry F. Olson, RCA Laboratories, Princeton, New Jersey, in the October, 1965, j ssue of the

JOURNAL OF THE AUDIO ENGINEERING SOCIETY ("Passive
and Active Acoustics In Architectural Enclosures," XIII, No.4,
pp. 307-318), by contrasting the charactertstics of an "acousftcolly passive orchitec ural enclosure" (no electronic modification) with on
acoustically ac Ive architectural enclosure"
(employment of· active electronic reinforcement). This "before
and
after" picture leaves lIttle doubt about the
dl(~cflon
archit~ctural acoustics will
toke In large architectural enclosures, once the multi·purpose function and complete range of
electronic

control exposes the costly

luxury and limitaTions of

the acoustically passive hall.

IOSITT

THEATRE DESIGN AND TECHNOUX;Y

Table of Contents for the Digital Edition of Theatre Design & Technology - May 1966