H. J. P. Sprengel
From Graces Guide
H. J. P. Sprengel ( -1906)
c.1865 Invented a vacuum pump whilst working in London[1]
1871 Hermann Sprengel, of Gloucester-street, Belgrave-road, in the county of Middlesex, has given notice in respect of the invention of "improvements in the preparation of safety explosive compounds."[2]
1872 Hermann Sprengel, ... has given notice in respect of the invention of "improvements in the preparation of explosive compounds."[3]
1873 Hermann Sprengel, .... has given notice in respect of the invention of "improvements in the production of sulphuric acid."[4]
1906 Obituary [5]
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