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IS0
I NTE R NAT1 O NA L O R GAN I ZATl O N STAN DA R D I ZATl O N
FO R
IS0 RECOMMENDATION
R2
DESIGNATION OF THE DIRECTION
OF TWIST IN TEXTILE YARNS
1 st E D IT1 O N
February 1954
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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FOREWORD
A standard designation for the direction of twist in textile yarns was
considered by the International Organization for Standardization through
its Technical Committee ISO/TC 38 - Textiles, the Secretariat of which is
held by the British Standards Institution.
This Committee examined ISA 1) Bulletin 28 - Single yarns and twisted
yarns.
During its first meeting, held from 7 to 12 June 1948 in Buxton (England),
the Technical Committee ISO/TC 38 unanimously decided to adopt as a Draft
IS0 Recommendation the designations S and Z for twists in yarns, the subject
of ISA Bulletin 28.
The following Member Bodies took part in this meeting:
Australia, Belgium, Czechoslovakia, Finland, France, India, Netherlands, New
Zealand, Sweden, Switzerland, United Kingdom, U.S.A., U.S.S.R.
On 10 January 1950, the Draft IS0 Hecommendatlon proposed by the
Technical Committee ISO/TC 38 was submitted to all the Member Bodies of ISO.
This Draft IS0 Recommendation was approved by the following 27 Member
Bodies :
Australia Hungary Portugal
Austria India Rumania
Belgium Israel Sweden
Canada Italy Switzerland
Chile Mexico Union of South Africa
Czechoslovakia Netherlands United Kingdom
Denmark New Zealand U.S.A.
Finland Norway U.S.S.R.
France Poland Yugoslavia
J-
At its Meeting in Geneva in July 1951, the IS0 Council unanimously accepted
the Draft IS0 Recommendation as an IS0 RECOMMENDATION (Reso-
lution No. 11, Council July 1951).
I) Published by the former International Federation of the National Standardizing
Associations (ISA).
-2-
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Ref. No.: ISO/R 2-1951/A 1-1961 (E)
UDC 6
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