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Bulldog ' s boarding party, led by Sub-Lieutenant David Balme, got onto U-110 and stripped it of everything portable, including her Kurzsignale code book and Enigma machine. [5] William Stewart Pollock, a former radio operator in the Royal Navy and on loan to Bulldog , was on the second boat to board U-110 .
The emblem and painted enigma were similar in that each usually contained some clue that the composition contained a hidden meaning, usually a "written legend which might be a verbal riddle or rebus to be solved by the same word, or a simple epigrammatic motto such as constituted the 'soul' of the emblem."
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
In this book we meet six of the ten men, four of whom we already knew. McCracken is the leader of the ten men and the most dangerous. Crawlings is the most careless (and has only one eyebrow). Garrotte is muscular, with a bushy beard. Sharpe is tall and wears glasses. In this book we meet Bludgins, one of the more eccentric of the Ten Men.
The Millennium Prize Problems are seven well-known complex mathematical problems selected by the Clay Mathematics Institute in 2000. The Clay Institute has pledged a US $1 million prize for the first correct solution to each problem.
In the 19th century book, A Guide to the Scientific Knowledge of Things Familiar, a proverb concerning magpies is recited: "A single magpie in spring, foul weather will bring". The book further explains that this superstition arises from the habits of pairs of magpies to forage together only when the weather is fine.
The Enigma machines combined multiple levels of movable rotors and plug cables to produce a particularly complex polyalphabetic substitution cipher.. During World War I, inventors in several countries realised that a purely random key sequence, containing no repetitive pattern, would, in principle, make a polyalphabetic substitution cipher unbreakable. [6]
At the end of the book, Mrs Hilton announces that Gladys is coming back. She is mentioned a few times in The Mystery of the Missing Necklace . It is unknown what happened to her, as by the beginning of The Mystery of the Hidden House , the Hiltons have a new maid, Lorna.