GV-70 PHOTOGRAMMETRIC ENGINEERING 
General Cullen's comments about the planning and execution are usual. It 
is extremely unfortunate that this same condition exists even today. Equipment 
is designed and experiments planned and, at the last minute, the photographic 
requirements are made known. This necessitates many important phases of the 
permanent photographic recording to be made with improvised set-ups. 
Gomer T. McNeil presented an excellent summarization of some of the 
non-topographic aspects of photogrammetry in PHOTOGRAMMETRIC ENGINEER- 
ING, March, 1955, pages 49-56. Several points, however, need clarifying. 
The High Speed Photography Committee of the Society of Motion Picture 
and Television Engineers was organized in January, 1948. In the minutes of the 
first meeting the requirements for good measurements were stressed. If Society 
correspondence were examined, it would be found that the term, ‘“photogram- 
metry'’ had to be ‘‘sold’’ to the Society. This is examplified bythe Symposium 
on data reducing equipment, presented at the Society's fall meeting in 1955. 
Another point to be clarified is that Mr. Shaftan was named Chairman of the 
Sub-Committee on Nomenclature. This was, and still is, a sub-committee of the 
High Speed Photography Committee of S.M.P.T.E. After the preliminary work 
by Messrs. Shaftan and Sultanoff (also of S. M.P.T.E.), a working glossary 1s 
is approaching completion under Messrs. Morgan and Waddell assisted by 
many organizations and interested individuals. 
There have been two great differences of approach to the nomenclature 
project: Whether the glossary should be extremely scientific; or whether it 
should be less scientific and more easily understood and translated. The latter 
conception is being followed by the Committee. It is hoped that this glossary 
will be ready for presentation at the Third International Congress on High 
Speed Photography, which is to be held in London, September, 1956. 
DISCUSSION 
The phase of photogrammetry relating to high speed motion pictures, time 
lapse pictures, still and multiple image photography and oscillography is pri- 
marily the photography of motion. The measurements, when the term is used 
broadly, are either qualitative or quantitative. Jean St. Thomas points out, in 
nomenclature being prepared by the Society of Photographic Engineers, that 
all nomenclature should be quantitative only; but in a glossary of high speed 
photography, being prepared by a Committee of S. M.P.T.E., it was decided 
that the terminology should be a working manual applied to both the qualita- 
tive and quantitative measurements. 
To illustrate the points of comparison just mentioned, the method of ob- 
servation and analysis of data presented on the picture bears consideration. 
Table I gives the comparative methods. 
In the qualitative observations, comparative sizes and distances only are 
needed; but for quantitative measurements, size, distance and time increments 
must be known. 
The time increment factor is important. The accuracy of the final results is 
dependent upon the accuracy of the recorded time. Electrically operated clocks 
are dependent on a frequency drift, or lack of drift, in the generating station. 
Because of the inter-area networks, this phase is relatively unimportant. Sixty 
cycles per second, for all practical purposes, is 60 cycles; but 60 cycles in a field 
generator can be practically any frequency between 50 and 70 cycles. 
Electric timing clocks with electro-magnetic clutches are useful if several 
precautions are taken into consideration. The clock motor should be running 
continuously and not started simultaneously with the operation being studied. 
7H,