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Activity cage with Veeder counter for recording rodent activity

1960-1970

Ellipsograph patented 6 July 1875 in Washington

1875-1885

Vaginal speculum

1851-1900

Concave Rowland diffraction grating on speculum metal

1894

Concave Rowland diffraction grating on speculum metal

1898

Plane Rowland diffraction grating on speculum metal

1895-1909 (estimated)

Electric hygrometer element in sealed glass tube

1944

Sensitive Hair Element

1941

Aircraft temperature

1939

Aircraft temperature

1941

Carrying case

1941

Carrying case

1939

Concave Rowland diffraction grating on speculum metal

1899

Concave Rowland diffraction grating on speculum metal

1894

Concave Rowland-type diffraction grating on speculum metal

1882-1909 (estimated)

Concave Rowland-type diffraction grating on speculum metal

1926, April

Concave Rowland diffraction grating on speculum metal

1882, Nov 6

Octagonal card with information about New Horizons probe to Pluto

2003-2006
Two preserved mice: one a 'knockout' with abnormally large muscles caused by genetic modification and one a wild type for comparison. Prepared at John Hopkins Medical School, Baltimore, Maryland, United States, 1998 (see note).

Preserved mice: one genetically modified and one natural for comparision

1998
Jar of yellow mercuric oxide ointment, in reused "Resinol" jar, supplied by N.F. Tyler, English

Jar of yellow mercuric oxide ointment

Plane diffraction grating with 14,438 lines per inch ruled on Rowland's engine at Johns Hopkins University on a plate prepared at the Astronomical and Physical Instrument Works of J.A. Brashear at Allegheny in 1890, on oxidised brass mount with circular rack and pinion for rotating grating, and three levelling screws

Plane diffraction grating with 14

1890
MRI sound System: Headphones and Transducer for use with MRI Scanner. Developed by Johns Hopkins University, Baltimore with help from the airline TWA.

MRI sound System: Headphones and Transducer for use with MRI Scanner

1985
Component, for Aircraft temperature, humidity and pressure recorder, by Julian P. Friez & Sons Inc, Baltimore, Maryland, United States of America, 1939

Component, for Aircraft temperature

1939
Concave Rowland-type diffraction grating on speculum metal, grating area 139 x 57 mm, with scratched markings reading 'Ruled at J. H. U. 1934 / R. W. Wood & W. H. Perry / 30,000 lines per inch / 21' radius of curvature'. (J. H. U. = Johns Hopkins University.)

Concave Rowland-type diffraction grating on speculum metal

1934
Aircraft temperature, humidity & pressure recorder, sensitive hair element, in tin-lidded topped glass tube, and carrying case, with three glass bottles secured under case lid, by Julian P. Friez & Sons Inc, Baltimore, Maryland, United States of America, 1941

Aircraft temperature