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Ref. No.: ISO/R 21 - I956 (E)
IS0
I N TE R N AT10 NA L
O R GA N IZATl O N FO R STAN DAR D I Z’ATI O N
IS0 RECOMMENDATION
R 21
SHIPBUILDING DETAILS FOR INLAND NAVIGATION
SPROCKET WHEELS
Isf EDITION
October 1956
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
of that country, being
by the national standards organization
a member of ISO.
For each individual country the only valid standard is the national standard of tha- country.
Printed in Switzerland
to be obtained through the national standards organizations.
Also issued in French and Russian. Copies
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BRIEF HISTORY
The IS0 Recommendation R 21, Sprocket Wheels, was drawn up by the
Technical Committee IS0 /TC 9, Shipbuilding Details for Inland Navigation,
the Secretariat of which is held by the Hoofdcommissie voor de Normalisatie in
Nederland (H.C.N.N.).
At its initial meeting (held in Paris, June 1949) the Technical Committee
unanimously decided to adopt as a Draft IS0 Recommendation a proposal sub-
mitted by the Netherlands Member Body. It was agreed to add to the Draft
a note stating that the illustration representing the sprocket wheel does not define
the construction.
In March 1954, the Draft IS0 Recommendation proposed by the Technical
Committee ISO/TC 9 was submitted to all the IS0 Member Bodies. It was
approved, subject to certain editorial amendments, by the following 19 (out of
a total of 33) Member Bodies:
Sweden
Belgium Italy
Canada Mexico Switzerland
Denmark Netherlands Union of South Africa
France * NewZealand * U.S.A.
Yugoslavia
Hungary * Pakistan
India Portugal
Ireland Spain
Japan opposed
...