(Born: Hannover, Germany, 25 September 1774; Died: Giessen, Germany, 9 May 1825) German engineer & technologist.

In 1805, Blumhof was the administrator of the iron works at Silbach. He was appointed in 1809 metal inspector in Ludwigshütte near Biedenkopf in Ober-Hessen. In 1819, he was named professor of technology at the University of Giessen, where he remained. He was an expert in iron production and authored several authoritative works on the subject.

Biographical references: ADB. • DBA: I 111,3 0-84; II 138, 426-428. • Ferchl. • Hamberger & Meusel, Gelehrte Teutschland, 1796-1834. • NDB: 2, 336 [by H. Dickmann]. • Poggendorff: 1, col. 215. • WBI.

Die spezifischen Gewichte der Korper, aus dem Franzosich des Hrn. Brisson. Ubersetzt und mit Anmerkung besounders die literatur betreff. von J.G.L. Blumhof. Mit Zusazzen von A.G. Kastner. Leipzig, 1795.
See under: Brisson, Mathurin Jacques.

1. German, 1803.
Völlstandige systematische Literatur vom Eisen in mineralogischer, chemischer, technologischer, ökonomischer, cameralistischer und medicinischer Rücksicht. Für Eisenhüttenenkundige, Technologen und Litteratoren herausgegeben von J.G.L. Blumhof ... Braunschweig, Vieweg, 1803.

8°: [i]-xiv, [1]-272 p.

Very scarce. A systematic review of the literature of iron from the standpoint of mineralogists, chemists, technologists, etc.

Bibliographical references: Dickmann, H., "Johann Georg Ludolph Blumhof (1771-1825) und seine Bedeutung für die Geschichte des Eisens", Beiträge Geschichte der Technische Industrie, 17, (1927), 157-9. • LKG: XVI 251. • Petzholdt, Bibliotheca Bibliographica, 1866: p. 567.

2. German, 1822.
Lehrbuch der Lithurgik | oder der | angewandten Mineralogie. | Für | Kameralisten, Oekonomen, Technologen, | Metallurgen und Forstmänner. | [rule] | Zum Gebrauch bey Vorlesungen auf Universitäten, Gymnasien und polytechnischen Lehranstalten | herausgegeben | von | D^r. J. George Ludwig Blumhof, | [...3 lines of titles and memberships...] | [rule] | [rule] | Frankfurt am Main. | Bey Franz Varrentrapp. | 1822.

8°: [i]-xii, [2], [1]-521, [1] p. Page size: 220 x 130 mm.

Very scarce. A general economic geology containing short discussions on minerals, rocks, earths, clays, fuels, etc that are used in arts and manufactures. The first section covers the physical and chemical properties of minerals, which is followed by discussions of individual minerals and gemstones. Each mineral type is discussed in relation to its geological occurrences and their economic importance. Unusual for the time, these discussions are well referenced, with included lists of literature pertaining to the individual species.

Bibliographical references: NUC: 62, 158. • Sinkankas, Gemology Bibliography, 1993: no. 719.

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