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1.7-inch ball conductor

1.7-inch ball conductor

French

19th Century

1.25-inch ball conductor

1.25-inch ball conductor

French

19th Century

1.25-inch ball conductor mounted on a rod

1.25-inch ball conductor mounted on a rod

French

19th Century

1.25-inch ball conductor mounted on a rod

1.25-inch ball conductor mounted on a rod

French

19th Century

$1.25-inch refracting telescope$

1.25-inch refracting telescope

English

1800-1830

1.25-inch terrestrial globe with case

1.25-inch terrestrial globe with case

English

19th Century

1-foot Gregorian reflecting telescope

1-foot Gregorian reflecting telescope

English

circa 1735

1-inch objective lens with cover

1-inch objective lens with cover

French

circa 1900

2.5-inch ball conductor

2.5-inch ball conductor

English

1775-1850

2.5-inch globe sundial

2.5-inch globe sundial

American

circa 1750

$2.75-inch refracting telescope$

2.75-inch refracting telescope

Samuel Thaxter & Son

1822-1843

2 eyepieces with cross-hairs

2 eyepieces with cross-hairs

American

1875-1900

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