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.