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Brass artificial horizon,engraved "Berge London late Ramsden"

1790-1819

Artificial Horizon from R.A.E. Farnborough

Pedulum type artifical horizon.

1842-1849

Ferranti type FH14M artificial horizon

circa 1964

Ferranti artificial horizon

Ferranti type FH7Z fast-erection artificial horizon

circa 1965

Ferranti M30/85 artificial horixon

Artificial horizon

Ferranti type BEX64/1141 EX1/63 artificial horizon

Ferranti Ltd type FHS/D2(C) artificial horizon

Ferranti artificial horizon

Wooden backstaff fitted with artificial horizon.

1730-1735

Ferranti Type FH7 Artificial Horizon

1957-1962

Ferranti artificial horizon

circa 1963

Ferranti artificial horizon

Ferranti type FH7J artificial horizon

circa 1964

Ferranti type FAD 1 artificial horizon

Artificial horizon in shagreen box, dark glass type, with spirit level

Artificial horizon

Artificial horizon with boxwood bottle of mercury, 1850-1900

Artificial horizon with boxwood bottle of mercury

Two Artificial Horizons Mk. IB.

Two Artificial Horizons Mk. IB.

Artificial horizon (incomplete) by John Frederick Newman (I. Newman)

Artificial horizon (incomplete) by John Frederick Newman (I. Newman)

Two artificial horizons L150 and L159, by The Sperry Gyroscope Corporation, United States of America, 1929-1949

Two aircraft Artificial Horizons L150 and L159: 1929-1949

1929-1949
Brass sextant with lacquered frame and limb, wooden handle and fitted with artificial horizon invented by Alexander Bridport Becher in 1834, and made by William Cary, London, England, 1835-45. Consists of inlaid polished silver 126° scale (-5° to 150°) with 20’ divisions and silver vernier (20”), three index-filter shades (red & 2 green), three horizon filters (red & green), scale magnifier on 55mm swivelling arm. Fitted with threaded telescope bracket for sighting telescopes (151mm – inverted image). The horizon consists of a 93-mm-long anodized brass tube with a bracket for attaching it to the sextant. The tube contains a pendulum that is lowered into a conical attachment (missing) filled with almond oil to dampen the pendulum's movement. A separate oil lamp (missing) can be fixed to the bracket for illumination at night.

Brass sextant with pendulum artificial horizon.

1835-1845
Octant with an artificial horizon patented by John Syeds, London, about 1791, and possibly made by him. Lacquered brass frame, a polished brass limb. Marked on the frame: Ino Seyds | Patentee No 12. Marked on the brass case of the artificial horizon: Iohn Seyds's Patent. Brass scale from -2° to 99° every 20', measuring to 99°. Brass vernier to 1', zero at the right. There is no tangent screw; the clamping screw is on the back of the index arm. No shades found, but holes in the frame suggest there may have been index shades. Index-glass adjustment by screw; adjustment of the horizon glass by a lever, wing nut and a milled clamping screw. Adjustment of the third glass, for reflecting the bubble of the artificial horizon, is by lever, wing nut and milled clamping screw. Sight vane with two pinholes and a swivelling shutter; the vane can be moved along the right strut of the frame over a short distance by a milled screw, and clamped into position by a second milled screw. The horizontal position of the brass case containing the bubble level can be adjusted along the left strut of the octant frame by a milled screw, and clamped into position by a second milled screw. The artifical horizon consists of a bubble level that, when the instrument is held vertically, is reflected by the third glass into the silvered part of the horizon glass, when the horizon is not visible. in box... not seen, WMB

Brass framed octant fitted with bubble artificial horizon and carrying case

1790-1799