Message #147995

[Bianca]

One of the popular contemporary systems for finding depth was Creyke's 'staking' method, which is important to our study because it challenges Underwood's assumption that all the patterns must have been fixed.

Underwood said that the water-line parallels were parallel lines which expanded and contracted in relation to the centre of the water-line by about ten per cent on a daily cycle; but Creyke's 'staking' system produced an unmoving circular 'parallel' around the point on the water-line which had been staked with a metal bar – a 'parallel' which vanished once the stake was removed.[25]