From an eBay auction for a 1912 biography, Lord Kelvin: His Life and Work (emphasis added, all of it sic):
Lord Kelvin was one of those super human beings who
excelled in everything he did.
Born in Ireland 1824, his father moved to Glasgow to be
a mathematics chair in Glasgow University. Then only
11 years old Lord Kelvin became a student there and
quickly became the star student!
He excelled in other
universities and even rowed in the winning team of
Oxford/Cambridge race. At age of 22 he became the
chair of natural philosophy in University of Glasgow
for 47 years, becoming a well-known author and authority.
He was one of the first persons to recognize the importance
of electricity and telgraphy. He developed many patents
of mathematics and physical inventions.
He was a specialist in heat, wave-motion,
electrostatics and magnetism.
He is most well known as a military leader.
This book has an emphasis on his scientific work.
Right. If you want a book with an emphasis on his military leadership in the war to liberate Mars, you need to read the previously mentioned one.