Columbia subject headings:
Harvard subject headings:
Cambridge Scientific Instrument Company--History.
Darwin, Horace, 1851-1928
Engineers--Great Britain--Biography
Instrument manufacture--Great Britain--Biography.
Scientific apparatus and instruments--England--Cambridge--History.
Princeton subject headings:
Cambridge Scientific Instrument Company--History.
Darwin, Horace, Sir, 1851-1928.
Scientific apparatus and instruments--England.