Lord Kelvin devised a glass tube which by the height of the discoloration gave you the exact depth, no matter how fast the ship was going; and the beauty of it was you kept the tubes as a register. It was an immense difficulty getting the Admiralty to adopt Lord Kelvin’s compass. I was reprimanded for having them on board. I always asked at a Court-Martial, no matter what the prisoner was being tried for, whether they had Lord Kelvin’s compass on board. It was only ridicule that got rid of the old Admiralty compass. At the inquiry the Judge asked me whether the Admiralty compass was sensitive (I was a witness for Lord Kelvin). I replied, “No, you had to kick it to get a move on.” But what most scandalised the dear old Fossil who then presided over the Admiralty compass department was that I wanted to do away with the points of the compass and mark it into the three hundred and sixty degrees of the circle (you might as well have asked them to do away with salt beef and rum!). There could then never be any mistake as to the course the ship should steer. However, a landsman won’t understand the beauty of this simplicity, and the “Old Salts” said at that time “There he is again--the d--d Revolutionary!” But to revert to “buying up opportunities”: I know no more signal instance of the goodness of Paul’s advice both to the Ephesians and Colossians in things temporal as in things spiritual than as exemplified by the Gunnery Lieutenant of the “Inflexible” in discovering a fracture in one of her eighty-ton guns. He was always thinking ahead in everything--“Buying up Opportunities.”