A G. Bernhardt's Combined Slide Rule And Propelling Pencil, German, early 20th century,in silvered metal, together with a Nicolet slide rule pencil, a Dring & Fage brass rule and 6-inch brass sector,
the largest 18in (46cm) long (4)FootnotesExhibited:
Scientific Instrument Society 25th anniversary exhibition, Museum of the History of Science, Oxford, 2008. (Dring & Fage slide rule)
A G. Bernhardt's Combined Slide Rule And Propelling Pencil, German, early 20th century,in silvered metal, together with a Nicolet slide rule pencil, a Dring & Fage brass rule and 6-inch brass sector,
the largest 18in (46cm) long (4)FootnotesExhibited:
Scientific Instrument Society 25th anniversary exhibition, Museum of the History of Science, Oxford, 2008. (Dring & Fage slide rule)
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
