Theatre Design & Technology - Oct 1973 - 18

With respect to relative stability, amber areas of the
spectrum should be the most stable, as luminous efficiency
is highest in this area for photopic vision (see Figure A).
The effects of burnout should become apparent on an
increasing scale as the outer limits of visible color are
reached. Gelatran, a mylar product, and Roscolar, a polyester base product, should show a greater stability than
Roscolene, on the basis of their advertisements.
This study, then, will attempt to confirm what is already known about color and color media and add to that
knowledge in specific terms of what the advancements in
the industry represent to the Iighti ng designer. Toward
that purpose, the method of experimentation is a repl ication of the method used by Gaiser and Rootes. Use of
that method, which showed its soundness in the three
trials of the Gaiser-Rootes study, will allow the results of
this study to be directly compared to the results of that
previous project.

In light of the Gaiser-Rootes tests and in order to add
to the information that was yielded by that experiment, a
replication of that testing of Roscolene was done as a
control factor in this experiment. In addition, two new
color medium products (to represent advancements in the
industry) were also used. One product, Roscolar, with a
polyester base, is manufactured by the same Rosco
Laboratories that makes Roscolene. The other, Gelatran,
made of mylar, is manufactured by Berkey Colortan.
Samples of each medium were obtained for the five color
areas. (A pale blue sample of Gelatran was not available,
consequently only Roscolene and Roscolar were tested in
this area). These represented not only a wide spectral
range and an apparent variation in color stabil ity but also
colors with a high incidence of use.
Following is a complete list of the colors tested.
Roscolene
802
815
842
849
863

-

Bastard Amber
Golden Amber
Special Lavender
Pale Blue
Medium Blue

-

Each color was tested in exactly the same manner and
at the same time Kliegl Bros. spherical reflector-fresnel
lens, 500 watt, six inch spotlights, No. 43N6, were used.
The instruments had all been purchased at the same time
and were approximately eight years old. Before testing,
each instrument was cleaned and re-aligned if necessary.
Each held a new ITT 500 watt T20/64 lamp, its life rated
at 500 hours. The lamps were all "burned in" approximately forty hours before the testing. The instruments
were hung and angled so that their optical axis formed a
45 degree angle with the floor. The lamp reflector of each
instrument were set at spot focus. Voltage was supplied to
the lamps through non-dim circuits of a Ward-Leonard
Solitrol System. The voltage was measured before each
exposure period on a Triplett 630-NS voltohmmeter.
Incident light from each instrument was measured on a
Weston 614 footcandle meter. The vertical distance of the
instruments was 8'6" from the floor, and the distance
from the center of the lens along the optical axis to the
floor was twelve feet. Surprisingly, twelve of the fourteen
instruments gave close to the same incident light output
that they did when they were first used in the GaiserRootes test, despite their almost constant use during the
eight years since that test, though a somewhat wider range
was noted. In order to balance the difference in incident
light output among the instruments, samples of like colors
were inserted in instruments with like footcandle readings.
Figure A

"....1-.0
,.,.. ,.........
.Uhlo_",
\

Bastard Amber
Golden Amber
Surprise Pink
Pale Blue
Primary Blue

I

-

\
\
\

/

Bastard Amber
Medium Amber
Medium Blue (primary)
Surprise Pink

As would be the case in normal theatre practice, the
samples used were obtained at different times and stored

18

1\

I
I

Gelatran
16
34
64
80

/ 1\
I \
I

1

Spectral
luminous
efficiency
in percent

Roscolar
902
915
942
951
963

for various lengths of time. Four of the Roscolar colors
were obtained two years before the testing and stored in
the shipping tubes. Four of the Roscolene colors were
taken from a theatre stock, this being a relatively lighttight storage cabinet. The age of each sheet of this stock
was less than two years. All the Gelatran, plus the
Roscolene Bastard Amber and the Roscolar Golden Amber
were obtained at the time of testing. Each sheet of color
medium would have undergone a minimal but normal
exposure to room light in its handling. Gaiser and Rootes
had determined in the results of their tests that these
variables in handling and storage time had no significant
bearing on their results.

~

/

/

\

-

,.11

THEATRE DESIGN AND TECHNOLOGY

'"

"

~

OCTOBER,1973



Table of Contents for the Digital Edition of Theatre Design & Technology - Oct 1973

Contents
Theatre Design & Technology - Oct 1973 - 1
Theatre Design & Technology - Oct 1973 - 2
Theatre Design & Technology - Oct 1973 - 3
Theatre Design & Technology - Oct 1973 - Contents
Theatre Design & Technology - Oct 1973 - 5
Theatre Design & Technology - Oct 1973 - 6
Theatre Design & Technology - Oct 1973 - 7
Theatre Design & Technology - Oct 1973 - 8
Theatre Design & Technology - Oct 1973 - 9
Theatre Design & Technology - Oct 1973 - 10
Theatre Design & Technology - Oct 1973 - 11
Theatre Design & Technology - Oct 1973 - 12
Theatre Design & Technology - Oct 1973 - 13
Theatre Design & Technology - Oct 1973 - 14
Theatre Design & Technology - Oct 1973 - 15
Theatre Design & Technology - Oct 1973 - 16
Theatre Design & Technology - Oct 1973 - 17
Theatre Design & Technology - Oct 1973 - 18
Theatre Design & Technology - Oct 1973 - 19
Theatre Design & Technology - Oct 1973 - 20
Theatre Design & Technology - Oct 1973 - 21
Theatre Design & Technology - Oct 1973 - 22
Theatre Design & Technology - Oct 1973 - 23
Theatre Design & Technology - Oct 1973 - 24
Theatre Design & Technology - Oct 1973 - 25
Theatre Design & Technology - Oct 1973 - 26
Theatre Design & Technology - Oct 1973 - 27
Theatre Design & Technology - Oct 1973 - 28
Theatre Design & Technology - Oct 1973 - 29
Theatre Design & Technology - Oct 1973 - 30
Theatre Design & Technology - Oct 1973 - 31
Theatre Design & Technology - Oct 1973 - 32
Theatre Design & Technology - Oct 1973 - 33
Theatre Design & Technology - Oct 1973 - 34
Theatre Design & Technology - Oct 1973 - 35
Theatre Design & Technology - Oct 1973 - 36
Theatre Design & Technology - Oct 1973 - 37
Theatre Design & Technology - Oct 1973 - 38
Theatre Design & Technology - Oct 1973 - 39
Theatre Design & Technology - Oct 1973 - 40
Theatre Design & Technology - Oct 1973 - 41
Theatre Design & Technology - Oct 1973 - 42
Theatre Design & Technology - Oct 1973 - 43
Theatre Design & Technology - Oct 1973 - 44
Theatre Design & Technology - Oct 1973 - 45
Theatre Design & Technology - Oct 1973 - 46
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1970May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1970Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
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