In all parts of the
world a safer landfall awaits the mariner. Two things must be
said: and, first, that Thomas Stevenson was no mathematician.
Natural shrewdness, a sentiment of optical laws, and a great
intensity of consideration led him to just conclusions; but to
calculate the necessary formulae for the instruments he had
conceived was often beyond him, and he must fall back on the help
of others, notably on that of his cousin and lifelong intimate
friend, EMERITUS Professor Swan, of St. Andrews, and his later
friend, Professor P. G. Tait. It is a curious enough circumstance,
and a great encouragement to others, that a man so ill equipped
should have succeeded in one of the most abstract and arduous walks
of applied science. The second remark is one that applies to the
whole family, and only particularly to Thomas Stevenson from the
great number and importance of his inventions: holding as the
Stevensons did a Government appointment they regarded their
original work as something due already to the nation, and none of
them has ever taken out a patent. It is another cause of the
comparative obscurity of the name: for a patent not only brings in
money, it infallibly spreads reputation; and my father's
instruments enter anonymously into a hundred light-rooms, and are
passed anonymously over in a hundred reports, where the least
considerable patent would stand out and tell its author's story.
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