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Title
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Telescope from George Ellery Hale
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Format
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photograph: negative
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Date
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1885
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Description
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With a 4.25 in. objective lens and a focal length of 40 in., the refracting telescope was probably first used by Hale for solar work. In his advancing years Hale used it at his private observatory. Reportedly, it was later used in the site search for the Palomar telescope and also in optics courses at Caltech through the late 1950s. With wooden stand. Manufacturer: John Byrne, New York, 1885.
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Title
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Grating, concave
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Format
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photograph: negative
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Date
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1901
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Description
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This grating was ruled on speculum; a light aluminum coat has since been applied. The plate was prepared by the John A. Brashear Co., Allegheny, PA. It was ruled on Prof. Henry Rowland’s engine at Johns Hopkins Univ., Baltimore, MD. Used by Bowen and Millikan from 1919 on.
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Title
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Oxygen analyzer, Model E2
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Format
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photograph: negative
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Description
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Serial no. 170. Gray metal case, streamline moderne styling. Long gauge, but cannot read indicator card. Mfg. Beckman Instruments, South Pasadena, CA.
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Title
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Planimeter no. 132
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Format
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photograph: negative
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Description
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Serial no. 6120. In black box lined in blue velvet. Came with manual “Compensating Polar Planimeters,” from Keuffel and Esser. Mfg. Deitzgen.
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Title
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Field protractor
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Format
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photograph: print
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Description
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Brown and Sharpe stainless steel field protractor for engineering/construction. Precision to five minutes of arc.
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Title
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Slide rule
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Format
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photograph: negative
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Date
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1900
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Description
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Polyphase slide rule; ivory and wood in original box with original manual, “The Mannheim and Polyphase Slide Rules.” Mfg. Keuffel & Esser Co, NY.
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Title
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Logarithmic slide rule
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Format
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photograph: print
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Description
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Czechloslovakian logarithmic slide rule for calculating reinforced concrete structures.
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Title
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Ion chamber, early (B)
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Format
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photograph: negative
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Description
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Small cylindrical electroscope with clock and photographic drum. Used by Millikan and Bowen in 1932. See Phys. Rev. 44:246-52 (1933). Mfg. CIT Physics Shop.
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Title
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Microscope of Max Delbrueck
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Format
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photograph: negative
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Description
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Bausch & Lomb, Model No. ZD1335, S/N 159185. 9″ x 4.5″ x 6″. Includes six extra lenses and two extensions.
