Carl Maximilian von Bauernfeind (*1818; †1894).

Carl Maximilian von Bauernfeind (*1818; †1894).
Carl Maximilian von Bauernfeind (*1818; †1894).
Bauernfeind, Carl Maximilian von; Elemente der Vermessungskunde, München, Vol. 1, 1856, p. 171.
Bauernfeind, Carl Maximilian von; Elemente der Vermessungskunde, München, Vol. 1, 1856, p. 171.

From 1844 Bauernfeind taught engineering and land surveying at the Royal Polytechnic School in Munich, as well as being an engineer for the Board of Building and Public Works in railway and bridge construction. Bauernfeind authored Elemente der Vermessungskunde, a standard surveying text book, that went through 7 edtions from 1856 to 1890.

Bauernfeind optical square

Invented by Bauernfeind in 1851, used to erect a perpendicular from a point on a line. Unknown maker, ca. 1900.

Bauernfeind double optical square

This instrument is a further development of the previous, and now has the advantage of being able to view both ends of a baseline (i.e. when marked by ranging poles) as well as a point perpendicular to it. Unknown maker, retailed by Gebr. Wichmann, early 19th century.

_______________________________

NOTES / REFERENCES

[1] BAUERNFEIND, Carl Maximilian von; Theorie und Gebrauch des Prismenkreuzes, München, 1851.

[2] BAUERNFEIND, Carl Maximilian von; Elemente der Vermessungskunde, Volume 1, 1st edition, München 1856, p. 171.

[3] Technischen Universität München http://www.geo.bgu.tum.de/index.php?id=19

[4] HEUSSI, Jacob; Lehrbuch der Geodäsie: nach dem gegenwärtigen Zustande der Wissenschaft für Feldmesser, Militärs und Architekten, Leipzig 1861, p.221. 

[5] http://de.wikipedia.org/wiki/Karl_Maximilian_von_Bauernfeind

[6] Online books by Baurenfeind

[7] JORDAN EGGERT; Handbuch der Vermessungskunde, Zweiter Band, Eerster Halbband, Stuttgart 1931, p.31-49.

[8] BERLIN, G.; Ueber ein Spiegelinstrument zum Einrichten gerader Linien auf dem Felde, Gruenert Archiv der Mathematik und Physik, Volume 4, p. 126-128.

[9] See also the équerre à miroirs (optical square) invented by Lipkens in 1811. 

[10] Berliner Adressbücher, Zentral- und Landesbibliothek Berlin.

[11] Gebr. Wichmann: In 1873 Emil Wichmann opens a shop in drawing supplies in Karlstrasse 14 in Berlin. Renamed Gebr. Wichmann when brother Gustav joins the company in 1876.

[12] Gebr. Wichmann 1904/05 catalogue, Internet Archive.