Wooden Cross-staff.

Made:
1687 in Saint-Malo
maker:
Hamon

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group
© The Board of Trustees of the Science Museum

A wooden cross-staff (possibly of hornbeam) made by Hamon, Saint-Malo, France, 1687. The original vanes are missing. Signed and dated on side one: Hamon . A . St. Malo 1687. The scales are from 90° to 33° (side one), from 90° to 11° (side three), and from 90° to 22° (side four); the maximum reading accuracy is 15' for each side. Only vague traces of the graduation on side two are visible. Graduated for altitude only; only the side number for side one is visible. The graduation runs from right to left, the sequence of the sides is 4, 3, 2, 1. Three modern wooden vanes, for the 30-, 60- and 90-degree sides.

Cross-staff, marked "Hamon a St. Malo 1687". The staff is original but the crosses are conjectural replicas.

Details

Category:
Navigation
Object Number:
1928-927
Materials:
brass (copper, zinc alloy), paint, varnish and wood (unidentified)
type:
cross-staff
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Thomas H Court