Follow the development of time measurement and technical and scientific innovation in timekeeping from the 16th to the 21st centuries.
Time Measurement
1801-1900
Horizontal compass sundial made for a latitude of about 59° (? St. Petersburg). The latitude of various places in Russia has been crudely engraved on the underside of the case, in the cyrillic script, at a later date. 19th century
1601-1700
Quadrant sundial of ivory, Italian hours, for use at latitude 44°, Italy, 1601-1700.
1845-1855
Pendulum scale for the regulator clock with gravity escapement, by J. M. Bloxam, 1845-1855
Perspex hood for the English Reifler escapement astronomical clock designed by E. T. Cottingham, unsigned
1797-1843
Sun-dial, brass octagonal shape, the dial is inscribed "Schreteger", German, 1797-1843, 2 1/2 in diameter
Ring Dial, brass, 1 1/2" diam.
1501-1700
Tablet Sundial of ivory, 3 1/2"x2 1/2"
Crystal of artificially grown quartz, complete with seed
Octagonal brass dial mounted on wood
1671-1700
Ivory diptych sundial for latitude 48 degrees by Georg Karner, Nuremberg, with vertical and horizontal dials, pin gnomon for Italian hours and lunar volvelle. Compass needle and glass cover missing. German, late 17th century. (B1667)
1876-1900
Horizontal sundial for latitude 50 degrees, in boxwood with string style and equation of time table. Compass needle and cover glass missing. English, last quarter of the 19th century. (B1696)
Copy of the gearing of the Byzantine sundial-calendar (1983-1393) three times true size, conjecturally completed, in perspex and brass
Centre-seconds impulse dial movement, with hands and enamelled dial
1587
Portable, ivory column sundial, indicating Italian hours, for use at latitude 43°, (height and diameter) 4 x 1-inches, possibly Italian, by F. F. Stephanus, Europe, 1587.
1900-1910
Chronometer movement in brass cage, fitted with dial and hands, lever escapement, Guillaume balance, steel hairspring, in mahogany case with glass top, Europe, c. 1900-1910.
1920-1925
Model of Paul Ditisheim's monometallic compensation balance for use with Elinvar hairsprings, with sunk poising screws to avoid barometric disturbances, Europe, 1920-1925.
1890-1945
Bracket clock with electrical impulse dial for seconds impulses, of a type invented by Sir Charles Wheatstone (1802-1875), probably made in London, England, 1890-1945.
Model of train of wheels used in a clock (full size), with fusee
Movement of rack-striking clock with "floating" balance and pin-pallet escapement
Model of anchor escapement as used in bracket clocks. (Ex. B.C.H. Exhibition, No.14)
1990-1996
Ricoh quartz analogue wristwatch, by Ricoh Elemex Corporation, Japan, c.1996. Serial number 312106. Model number J-312-3040. Promotional gift from Gifu Prefectural Government, Japan. Dial marked "Heart of Japan GIFU". With leather strap, presentation case and instructions.
Japanese table clock, in porcelain case with box
Case for tell-tale clock by Slark
1776
Verge watch in pinchbeck shagreen case (damaged), by A. Juhan, Dortdrecht, pendulum balance, 1776, donated by Evan Roberts in 1916
Model by Dent showing the mechanism of stop watches (full size)
Wooden model of compensation balance wheel (magnified)
1845-1847
2 movement screws for the electric clock, by Alexander Bain, United Kingdom, 1845-1847
1740-1760
Verge watch in gold enamelled case by Le Roy, (eleve de Breguet), no.30279, oriental dial, 1740-1760. The back of the gold case is decorated with a river landscape.
1870-1910
Watch (French or Swiss) with balance wheel visible through a window in the dial
1851-1900
Universal equinoctial sundial in wooden case with table of latitudes on the lid. French, second half of the 19th century (B1686)
Original card case for mechanical equinoctial sundial for latitude 52 degrees, French, c.1800 (B3275)
1771-1800
Alarm watch in gold plated case, no. 18595, French verge, bell, by Meuron and Co., Chaux de Fonds, France, 1771-1800
1780-1880
Double sand-glass in wooden mount. 14 mins. and 29 mins. Abbot Horne. No.25. Type A, 1780-1880
Key for regulator clock with gravity escapement, unsigned
1905-1915
Quarter-repeating lever chronograph watch, 1905-1915
Geneva independent centre seconds movement, horizontal escapement, seconds hand missing, damaged, 1801-1900, Switzerland, donated by Evan Roberts in 1916
1850-1910
Swiss lever watch with tourbillon movement, 1850-1910
1701-1800
'Detached Repeater', for bracket clock, unsigned, Europe, 1701-1800.
1880-1935
Mahogany base and glass dome for model of Duplex escapement as employed in the early Waterbury watches
1920-1960
12 watch fusee chains, wound on one piece of card 2½ x 1 7/8-inches, unsigned, Europe, 1920-1960.
1915-1940
Synchronous timepiece movement with panel indication of day, hour and minute, unknown maker and provenance, 1915-1940.
1937
Metal bolts from the regulator timepiece, by A. V. Parlby, United Kingdom, 1937
Lead driver weight from the regulator timepiece, by A. V. Parlby, United Kingdom, 1937
1930-1940
Ferranti electric wall clock.
Spring only, as employed in the early Waterbury watches, 1880-1935
Universal equinoctial ring sundial signed (in Cyrillic) "A.S. Trindin, Moscow". The calendar declination scale incorporates the equation of time and some of the scales are also marked in Arabic. Russian, 18th century (B1680)
Universal equinoctial ring dial in silver, engraved in nagari script to indicate the time before and after noon in ghatis (suspension piece missing). In teak case. Indian, 19th century
c. 1900
Set of three observatory watches with keyless lever movements by the American Waltham Watch Company, in a fitted mahogany case. Comprising a sidereal watch with 24 hour dial and two mean time watches. c.1900
1972
Electronic f 300 Hz Seamaster Chronometer wrist watch made by Omega, of Bienne, Switzerland, with escapement made by Bulova controlled by an electrically maintained tuning fork, sold new in Jersey, Channel Islands, in 1972
