A 5″ slide rule was contained in a soft leather case and is made of celluloid. The slide is grooved and the cursor is metal framed with a glass indicator having a single hairline. The scales are unmarked and the only information present is that it was patented by Berville of Paris and made in France. The back of the slide and the stock are both blank.
Accession Number: 2010.lej.41
Primary Materials: Celluloid (plastic)
Old Inventory Number = 41.
“Bte S.G.D.G.” Berville-Paris”, “Made in France”
Length = 14.5 cm, Width = 3 cm, Height = 0.3 cm
Function: Facilitating calculations
In good working condition with some some discolouration.
Manufacturer: P. Berville, Paris
Date of Manufacture: c. 1930s
From the personal collection of L. E. Jones.
Additional Information and References:
P Berville of Paris was a French maker of scientific instruments, famous for the Lucida Camera.
The initials S.G.D.G. indicate that this instrument was patented but the patent was not protected by the government.