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Concave Rowland-type diffraction grating on speculum metal

Concave Rowland-type diffraction grating on speculum metal

1926, April
Ellipsograph patented 6 July 1875 in Washington

Ellipsograph patented 6 July 1875 in Washington

1875-1885
Concave Rowland diffraction grating on speculum metal

Concave Rowland diffraction grating on speculum metal

1898
Concave Rowland diffraction grating on speculum metal

Concave Rowland diffraction grating on speculum metal

1899
Activity cage with Veeder counter for recording rodent activity

Activity cage with Veeder counter for recording rodent activity

1960-1970
Concave Rowland diffraction grating on speculum metal

Concave Rowland diffraction grating on speculum metal

1882, Nov 6
Aircraft temperature

Aircraft temperature

1939
Vaginal speculum

Vaginal speculum

1851-1900
Sensitive Hair Element

Sensitive Hair Element

1941
Concave Rowland diffraction grating on speculum metal

Concave Rowland diffraction grating on speculum metal

1894
Concave Rowland diffraction grating on speculum metal

Concave Rowland diffraction grating on speculum metal

1894
Octagonal card with information about New Horizons probe to Pluto

Octagonal card with information about New Horizons probe to Pluto

2003-2006
Plane Rowland diffraction grating on speculum metal

Plane Rowland diffraction grating on speculum metal

1895-1909 (estimated)
Concave Rowland-type diffraction grating on speculum metal

Concave Rowland-type diffraction grating on speculum metal

1882-1909 (estimated)
Electric hygrometer element in sealed glass tube

Electric hygrometer element in sealed glass tube

1944
Aircraft temperature

Aircraft temperature

1941
Carrying case

Carrying case

1941
Carrying case

Carrying case

1939
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
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
Jar of yellow mercuric oxide ointment, in reused "Resinol" jar, supplied by N.F. Tyler, English

Jar of yellow mercuric oxide ointment

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
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

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