A fine early 20th century brass marinerís navigational sextant produced by Henry Hughes & Son in a classic lattice frame design. Features a graduated silver arc and brass venier, brass frame and fittings with traces of the original black on various parts of the sextant surfaces. Engraved on arc "Henry Hughes & Son, 59 Fenchurch St. London E.C.". Above is the serial number 9561. The HUSUN registered trademark London is stamped on the left side in to the brass vernier scale.
An exceptional maritime instrument surviving in good working order and complete with three scopes, filters and scope. The silver scale is calibrated -5 to +150 degrees and the silver vernier scale, marked from 0 to 10 allows a reading down to a very accurate 10 arc seconds. The reading is set by a notched thumb screw and a fine adjustment knob. The sextant has four shades for the index mirror, and three shades for the horizon mirror, all surviving in good order. The sextant, scopes and accessories are housed in it's original machine dovetailed mahogany box with brass carrying handle on one side. The box lock and keep are still intact, but the key is missing. The brass escutcheon plate is also missing and the non-engraved brass plate on the box top is a contemporary replacement. The rosewood handle, index arm clamp, and swing arm magnifier are complete and in good working order. The telescope adjusts up and down by turning a knob located below the frame.
The original inspection certificate is attached to the interior box top. The label states: THE NATIONAL PHYSICAL LABORATORY. CERTIFICATE OF EXAMINATION CLASS A. THE SEXTANT NO. 9561 of 7 inches radius named H. Hughes & Sons Ltd. London dated on silver with vernier showing 10" has been examined by this institution. The shades and mirrors are good. The telescopes are also satisfactory and the powers are, for the inserting 10, 6, linear, for the erect 2 1/2 linear. The following are the corrections to the readings of the arc (in addition to the index correction) :- (see photograph). The certificate is dated December 1919 and signed by J. E. Petanel.
A paper label is attached to the interior side of the box lid T. S. & J. D. NEGUS, NAUTICAL INSTRUMENT MAKERS, 140 WATER ST. NEW YORK. P-258.
According to H. Hughes & Sons history that we could find, the "HUSUN" trademark was in use starting in the 1920's. This sextant is clearly dated 1919 predating the manufacturing history and would indicate it to be one of the first HUSUN sextants offered in the marketplace!