Sir W H Bailey & Co. Ltd patent engine revolution indicator

Sir W H Bailey & Co. Ltd paten Sir W H Bailey & Co. Ltd patent engine revolution indicator, c

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Sir W H Bailey & Co. Ltd paten
Science Museum Group
© The Board of Trustees of the Science Musuem

Sir W H Bailey & Co. Ltd patent engine revolution indicator, c
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Sir W H Bailey & Co. Ltd patent engine revolution indicator, c. 1900