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miscellaneous metal objects with sliding parts

miscellaneous metal objects with sliding parts

American

mid 20th-late 20th Century

magnetic objects (Lunaballs)

magnetic objects (Lunaballs)

American

1920-1950

miscellaneous metal objects with sliding parts

miscellaneous metal objects with sliding parts

American

mid 20th-late 20th Century

assorted metal objects

assorted metal objects

American

early 20th-late 20th Century

parts box holding Tolles workshop objects

parts box holding Tolles workshop objects

Robert B. Tolles

1875-1900

2-foot Gregorian reflecting telescope with split object glass micrometer

2-foot Gregorian reflecting telescope with split object glass micrometer

James Short

circa 1763

object glass micrometer for Cassegrain telescope

object glass micrometer for Cassegrain telescope

Dollond & Son

1758-1764

object base with central hole and six screw holes

object base with central hole and six screw holes

American

late 19th-early 20th Century

unknown object used for meteorological purposes

unknown object used for meteorological purposes

American

early 20th Century

object-slide micrometer

object-slide micrometer

Ernst Leitz (company)

circa 1902

split object glass in tension frame to study strain by polarization

split object glass in tension frame to study strain by polarization

Jean Baptiste François Soleil

1840-1860

opaque object holder

opaque object holder

Wild Heerbrugg Ltd.

circa 1960

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