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Brass sextant with gyroscopic artificial horizon.

Brass sextant with gyroscopic artificial horizon.

1830-1870
Case for Brass sextant with gyroscopic artificial horizon.

Case for Brass sextant with gyroscopic artificial horizon.

1830-1870
Brass framed double reflecting circle.

Brass framed double reflecting circle.

1830-1870
Case for double reflecting circle.

Case for double reflecting circle.

1830-1870
Brass sextant with black lacquered frame, polished brass limb, wooden handle and fitted with gyroscopic artificial horizon invented by French Admiral Fleuriais, and made by Hurlimann, Ponthus and Therrode, Paris, France, 1910-19. Consists of inlaid polished silver 126° scale (-5° to 107°) with 20’ divisions and silver vernier (30”), three index-filter shades (red, green & orange), two horizon filters (orange), scale magnifier on 70mm swivelling arm. Fitted with threaded telescope bracket for sighting telescope (191mm – upright image). Supplied with horizon light, magnifier, adjusting key and other accessories with circular brass box and mahogany case with manuscript instructions. The artificial horizon consists of an airtight housing containing a gyroscope that can be locked with a lever mechanism. The gyroscope has a glass piece through the body, with a series of horizontal lines, and is propelled by an air pump. The air gauge is calibrated from 0 to 76 cm of mercury.

Brass sextant with gyroscopic artificial horizon and case.

1910-1919
Double reflecting circle made by A. Hurlimann, successor to Lorieux, Paris, France, about 1900. Circular anodized brass frame and index arm, a hinged wooden handle. Signed on the brass limb: Lorieux, A. Hurlimann, succ.r a Paris (172). Inlaid silver scale from -5° to 195° every 30'. Silver vernier to 1', zero at the right. The index arm carries the index glass, the horizon glass is fixed on the frame. The tangent screw is on the front of the index arm; the clamping screw is on the back. Seven detached index and horizon shades (six green, one orange). Two index glasses, adjustment on both and on the two horizon glasses by square-headed screws and a detached key (missing) and by capstan screws. Magnifier (single lens) on a 65 mm swivelling arm. Telescope (100 mm), erect image, fixed in its bracket; perpendicular adjustment by rising-piece and a milled knob. Two shaded eyepieces (both green). A screwdriver; a magnifying glass; an adjusting key; an adjusting pin. A square fitted mahogany box (lid cracked) containing in the lid a trade label for A. Hurlimann, Ponthus and Therode, 6, rue Victor Considerant, Paris, and printed instructions in French for cleaning the scale. Painted on the front of the box: H.O [broad anchor] 202.

Brass framed double reflecting circle with case.

1895-1900