Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part
of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open
content license such as Creative Commons.
Source:
Publication 167 of the Netherlands Ship Model Basin, NSMB, Wageningen, Published in: International Shipbuilding Progress, ISP, Volume 6, No. 63, 1959