Artikel 22

The position of the middle transverse section, as determined on the tonnage deck, is now to be transferred into the hold (machinery spaces, bunkers, etc.) perpendicularly to the keel line of the ship, by using the distance from a bulkhead, hatch-coaming, etc., as measured in accordance with Article 20.
By setting off forward and aft from the position of the middle section, as determined in the hold, the common interval between the various sections, the positions of the other sections are determined and marked off on the bottom ceiling, the tunnel, the keelson or whatever may be found suitable. The common interval is to be set off parallel to the keel line, and in the middle plane of the ship, or parallel to it. The correctness of the positions of the various transverse sections is to be verified by measuring distances to bulkheads, hatch-coaming, etc., and checking such distances on top of the tonnage deck.
When it is not possible to measure a transverse section at its correct position, it should be measured as close thereto as possible.1) It may even be advisable to measure two subsidiary transverse sections situated respectively forward and aft of the correct position (see Article 44). It should be very accurately ascertained how far forward or aft of the correct position the section is being measured, and full particulars as to this should, if necessary, be given in the formulae of measurement.
In ships propelled by machinery, the distance from the machinery bulkhead to the correct position of the nearest section should be ascertained, both as regards the foremost and aftermost bulkheads, and stated on the formulae of measurement.