List of sources:
Apparatus for subdividing streams of pulp and other liquids. Google Patents. Retrieved on 10 September 2020 from https://patents.google.com/patent/US1020251A/en
FamilySearch: Charles Friederich Eduard Oscar Schmitt. https://www.familysearch.org/ark:/61903/1:1:QPHZ-YM55?lang=en
Journal of the
Chemical, Metallurgical and Mining Society of South Africa, 1910/11 and 1911/12, Vol. 11 and 12, paper by C.O. Schmitt and discussion.
Report of the South
African Association for the Advancement of Science, 1905/6 and 1910: Lists
of members.
South African bibliography
to the year 1925. London: Mansell, 1979.
Transactions of the
South African Institution of Engineers, 1913, Vol. 1, office bearers.