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Ref. No. : lSO/ R 182 - 1080 (E)
IS0
I NT ERN AT1 O NA L
ORGAN IZATl ON FOR STAN DARD IZATl O N
IS0 RECOMMENDATION
O
R 162
LOCATION OF RECORDING HEADS
FOR THREE MAGNETIC SOUND RECORDS ON 35rnm FILM AND
ONE MAGNETIC SOUND RECORD ON 17.5 rnrn FILM
1st EDITION
July 1960
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COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 162, Location of Recording Heads for Three Magnetic
Sound Records on 35 mm Film and One Magnetic Sound Record on 17.5 mm Film, was drawn
up by Technical Committee ISO/TC 36, Cinematography, the Secretariat of which is held by
the American Standards Association, Inc. (ASA).
During its first meeting, held in New York, in June 1952, the Technical Committee
turned over to its Secretariat the study of a draft proposal for an IS0 Recommendation
drawn up as recommended by the Working Group No. 4, Dimensions and Locations for
Sound Records on the basis of the American Standard PH22.86-1953 (Dimensions of
sound records on 35 mm and 17.5 mm motion picture film).
This draft proposal was submitted, in September 1954, to the Technical Committee
for adoption, and in December 1954 to the IS0 Member Bodies for approval.
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At the second meeting of ISO/TC 36, held in Stockholm, in June 1955, it was unanim-
ously decided, in the light of certain observations put forward by the Working Group, to
have the Secretariat undertake the study of a new draft proposal to take the place of the
first one.
In October 1955, this second draft proposal was presented to the members of the
Technical Committee; it was recast by the Secretariat to incorporate a number of substan-
tially similar observations made by France, Sweden, the U.S.S.R. and the United Kingdom:
when submitted in this modified form to the members of the Technical Committee ISO/TC 36
for their approval, it was adopted as a Draft IS0 Recommendation.
On 27 December 1957, the Draft IS0 Recommendation (No. 199) was distributed to
all the IS0 Member Bodies and was approved, subject to some modifications, by the
following Member Bodies :
Belgium Germany Rumania
Bulgaria Hungary Sweden
Switzerland
Burma Italy
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Canada Japan United Kingdom
Czechoslovakia New Zealand U.S.A.
France Portugal U.S.S.R.
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in July 1960, to accept it a9 an IS0 RECOMMENbATION.
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IS0 / R 182 - lSU0 (E)
IS0 Recommendation R 162 July 1960
LOCATION OF RECORDING HEADS
FOR THREE MAGNETIC SOUND RECORDS ON 35 mm FILM
AND ONE MAGNETIC SOUND RECORD ON 17.5 mm FILM
1. SCOPE
This IS0 Recommendation specifies the location and dimensions of the magnetic sound
recording heads for recording up to three magnetic sound records on 35 mm motion-
picture film and one magnetic sound record on 17.5 mm motion-picture film.
This IS0 Recommendation relates the placement of the magnetic coating on the film to
the direction of film travel.
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2. DIMENSIONS
The dimensions are as specified in the figure and the table below.
3. souNDREcoRDs
should be employed when recording a single sound record on 35 mm film.
Head No.
Head No. should be employed for recording the sound record on 17.5 mm film.
4. MAGNETIC COATING
With the direction of film travel shown in the figure, the magnetic coating is on the upper
face of the film base.
O No. 1 No. 2 No. 3
Recording
Dimension Millimetres Inches
heads in line
A + 0.004
The Iona chain lines
4 shown &e the mechanical
center lines of the pole tips
B 8.6 f 0.05 0.339 f 0.002
of the recording heads
C 8.9 f 0.05 0.350 -+ 0.002
D 17.8 f 0.05 0.700 f 0.002
Travel
I I
(base down)
Note: The millimetre and inch dimensions represent acceptable practice, though positions of the outer tracks differ slightly in
the two systems. The advantage of round numbers in both systems Justifies the differences.
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Date of the first printing:
Price: sw. fr. 1.50
November 1960
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CDU 778.1
RBf. NO: 180/R 162 - IMO (F)
IS0
O RQ A N I SAT1 ON
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