Railway slide rule

Made:
1928 in England
One of nine railway slide rules, English, three signed P.H.J

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One of nine railway slide rules, English, three signed P.H.J
Science Museum Group
© The Board of Trustees of the Science Museum

One of nine railway slide rules, English, three signed "P.H.J. 1928", eight paper on wood with brass fittings and one ivorine on wood