Carl Otto was scientific instrument maker at Melbourne Observatory, probably on a part-time basis, from at least 1886 until as late as 1911. He also worked at the Royal Mint, and had his own business at 256 Elizabeth Street, 1898-1902.

Bolton, H.C. and Williams, N. (1998). 'Scientific Instrument Makers and Dealers in Victoria, 1840-1914', Historical Records of Australian Science, 12 (1), p.56.

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