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Owing to diffusion gas escapes with extraordinary rapidity, and if the fabric used is not absolutely gastight the air finds its way in where the gas has escaped.

This overlap is sewn and taped on to the envelope and forms a seam as strong and gastight as any other portion of the envelope.

When it passes over the wooden ring it is in contact with the envelope fabric and makes the junction gastight.

The faults requiring remedy were, firstly, the upper cross stays, which buckled in flight owing to insufficient strength for the length of the hull; secondly, the gasbags were not sufficiently gastight and, thirdly, the power of the engines were not sufficient for such a heavy ship.