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"Apis" matrix retainer

1970-1980

Gaede steel slit diffusion pump

1920-1927

German armillary sphere, 1542

1542

Nest of Cologne bronze standard weights, 1616

1616

Dental gauze

1950-1970

Gaede single stage all-metal pump with accessories

1923-1928

Gaede molecular vacuum pump

1910-1914

Coin scales and weights

1651

Wulf electroscope fitted with projection attachment consisting of lamp house

1950-1974

German armillary sphere, 1553

1553

Microscope stand attributed to G.V. Schleenstein of Cologne

1771-1800

Gaede 3-stage metal diffusion pump

1915-1927

Wet gas meter, 3 light capacity, 368mm height x 300mm width x 275mm depth, in steel case painted green with gold lining, three areas glazed to reveal mechanism, by W H Moran, Cologne, serial no. 10202, 1861, with three dials measuring in 10s, 100s and 1000s of cubic feet, with hinged cover for the dials and three detachable metal covers to the glazed areas.

Wet gas meter, in steel case, with hinged dials cover and detachable metal covers

Boxed tube of "Balsalyt", by Dr. Madaus and Co. Cologne

Boxed tube of "Balsalyt", by Dr. Madaus and Co. Cologne

Metal water-jet filter pump (no.15220), sectioned, in two pieces, by E. Leybold's Nachfolger, Cologne, Germany, 1924-1934

Metal water-jet filter pump (no.15220)

1924-1934

Model, scale 1:5, Pelton wheel turbine, by Peter Koch, Victor Gelpke and Paul Kagel, Germany, 1907-1917, represents an installation by Messrs. Amme, Giesecke and Konegen of Brunswick, invented by Lester Allan Pelton. Part sectioned to show Pelton wheel.

Pelton Wheel Turbine

1907-1917

Condenser marked "No 615 E Leybold's Nachfolger AG Koln" used in work on electric dipole moments, 1930s

Condenser marked "No 615 E Leybold's Nachfolger AG Koln" used in work on electric dipole moments

1930-1939

Folding clinometer rule with case, by D. Mauch, Cologne, Germany, 1855-1865

Folding Clinometer Rule, 1855-1865

1855-1865

Lens barrel with iris diaphragm calibrated 0-5 with 7 lens components 15/25/35/45/55/65/75. With 11 combinations for normal and wide angle use. Lens No 4629.

Janssen combination lens

Clinometer rule and compass with case, Glover's patent of 1839, by D. Mauch, late 19th century to early 20th century

Clinometer rule & compass, 1885-1905

1885-1905

Double wire-loop oscillograph for studying the waveforms of electrical oscillations, by Leybold, c.1960

Double wire-loop oscillograph for studying the waveforms of electrical oscillations

1950-1974

Stollwerck's 'Chocolate Phonograph' by Stollwerck Bros., Cologne, Germany, with wax disc, song 'British Grenadiers', 1903. Fitted with later cardboard disc and foam packing.

Stollwerck chocolate disc phonograph, 1903

1903

model, scale 1:5, Mannesmann's tube rolling mill, plus components (see 2 stroke nos).

1:5 Scale Model Mannesmann's Tube Rolling Mill

1912

Five specimens illustrating the Mannesmann process of solid drawing steel tubes.

Five specimens illustrating the Mannesmann process of solid drawing steel tubes