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APPENDIX
As emphasized in the Introductory Statement of
this Academy Report, and repeated in other parts
of the book, the researches, proceedings and transactions
of the Academy in relation to Incandescent
Illumination contained in the foregoing pages are
not meant to be in any way final or conclusive as
to results. It is enough that present developments
in illumination problems are made Iaitly clear'
These developments are continuing and will certainly
so .oniir,t,. indefinitely' The Academy has
efiected only a beginning.
FUTURE RESEARCHES
It is, there{ore, with pleasure that the announcement
is made that all studios are keeping records of
their experiments and experiences in all kinds of
illumination which may be made available for surveys
from time to time in the future {or the benefit
of the industry.
The value o{ this continuation of researches in all
kinds of illumination is more than ever apparent,
now that the industry has become actively involved
in the production of sound and voice pictures' Illumination
that can be silently employed is obviously
essential {or sound reproductions and the more per-
{ect this silent illumination can be made for photographic
efiects, the greater will be the combined
results.
DEFINITION
There are many important points to be cleared
up, and among them there is one that was not gone
into with detailed attention during the recent researches,
but is now being made the subject of a
special enquiry by the AcademY.
The point is this: Can Incandescent Illumination
be relied upon to give approximately as much definition
in photography as Arc lighting? The question
has come up in connection with the plans of a certain
producer whose business is almost solely with
the smaller classes of theatres where projection is
not always of the best. It has been well known in
the induitry since its start, that inadequate projection
in u rity large number of badly equipped and
operated theatres, has completely nullified so-called
aitistic efiects in photography. Pictures that are
praised for their fine lighting when well p{ojected
iru-r. upp.uted on the screen as blotches, shadows
and undistinguishable blurs. There{ore, to guard
against this, producers catering to the smaller theaters
have been obliged to photograph all their product
with a special view to sharp definition. Can
any other form of illumination than Arc meet this
requirement? An enquiry has been sent to the
Technicians of the Academy and to other authorities
for the purposes of securing a concensus of
opinion on the question.
ORDERING LAMPS
A report* entitled' "How to Order Mazda
Lamps for Best Results at Lowest Cost," obtained
through the courtesy of Mr. R. E. Farnham of the
Natioiral Lamp Works of the General Electric Co',
recommends that the producers "make 115 volts the
standard for all their studio circuits and instruct
their purchasing departments to order lamps for
their studio equipments according to the {ollowing
167 l
schedule:
Watts
Rulb
Order LamP Labeled
1,000
PS-52
105 volts
1,000
T-20 Beacon 110 volts
1,500
PS-52
105 volts
2,500
PS-52
105 volts
2,000
G-48 115 volts
5,000
G-64 115 volts
10,000
G-80 115 volts"
It is explained that the first four types were not
designed solely for photographic service; and that
it his been found that when operated, as indicated,
above their rated voltages, the amount and actinic
value of the light are increased and best results in
color rendition are obtained. The li{e of the lamp
is somewhat shortened by this use, but, on the other
hand, the relative expense due to breakage will probably
6e lessened. Graphs are given,in support of the
conclrlsion that the total cost of photographic light
obtained is least when the lamps are used as indicated
above.
PRESENT EQUIPMENT
The material in the following section of the Appendix
was gathered in response to a demand for
photographs and descriptions of the various types
u"a of Incandescent equipment available for
use. -oa.t Manufacturers known to the Academy weie
solicited. The photographs and descriptions which
follow are available through the co-operation of
First National Productions Corporation, Mole-
Richardson, Inc., Creco, Inc.' and Gustav Deitz'
Manufacturers of equipments other than those herein
included are requested to send photographs and
descriptions of this product to the Academy for use
in later reports.
Equipments are designated as named by the :espective
manufacturers. In this connection it is felt
tlat with the increase in number of the types and
models of equipment available communications between
studios would be greatly facilitated by the
adoption of astandard nomenclature. A committee
t tuy b. appointed by the Academy to study this
problem. . . .
--gopie"
of this report can be obtained tbrough
the Academy.