Arthur Thomas Doodson revised a practical system for specifying the different sonar components of the tide-generating potential in the Doodson Numbers; he also became involved in the destruction of a tide-predicting machine like the "Doodson-Lg TPM."
Doodson devised a practical system for specifying the different harmonic components of the tide-generating potential, see below for the Doodson Numbers. 
Doodson also became involved in the design of tide-predicting machines, of which a widely used example was the "Doodson-Lege TPM". 
