Technology

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London, Oliver and Boyd, 1957.

MEYER, KARL.

Kbhvn., 1918.

HOUSTON, ALEXANDER CRUIKSHANK.

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MEALY, GEORGE H.

New York, American Telephone and Telegraph Company, 1955.

KAUFMANN, WALTER.

Oldenburg, 1962.

POND, JOHN. - TROUGHTON'S ASTRONOMICAL CIRCLE DESCRIBED.

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Frankfurth und Leipzig, 1755.

PHYSIKALISCHEN WERKSTÄTTEN A.=G. GÖTTINGEN.

Göttingen, n.d. ca. 1910.

GRAY, FRANK & J. W. HORTON & R. C. MATHES.

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Augsburg und Leipzig, 1826-27.

LILIENTHAL, OTTO. - THE FATHER OF MODERN AVIATION.

Berlin, Mayer & Müller, 1894.

URQUHART, J.W.

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CARSON, JOHN R.

New York, American Telephone and Telegraph Company, 1928.

LÜDER, CHRISTIAN FRIEDRICH von.

Frankfurt am Mayn, Johann Gottlieb Garbe, 1779.

SPON, E. & F.N.

London, E. & F.N. Spon, 1869-74.

FRIIS, F.R.

Kbhvn., 1867.