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$9 lantern slides of diffraction patterns, atomic structure, spectra.$

9 lantern slides of diffraction patterns, atomic structure, spectra.

Jefferson Physical Laboratory, Harvard University

1925-1940

60° fused quartz prism

Theodore Lyman IV

circa 1920

100g of yttrium dust in sealed glass tube

Percy Williams Bridgman

circa 1925

Acme mounted rectifier, oscillator, and vacuum tube for teaching

ACME Apparatus Company

circa 1920

ACME Reflex Acmefone radio receiver

ACME Apparatus Company

1923

Acme type Y-1 vacuum tube radio detector

ACME Apparatus Company

1920

Ader "bull ring" receiver

Louis-Clément Breguet

circa 1881

Ader "bull ring" receiver

Louis-Clément Breguet

circa 1881

alternating current motor demonstration (?)

Central Scientific Company

ca. 1910-1940

aluminum alloy samples in sealed glass jar

Aluminum Company of America

circa 1925

AMRAD type 2797 grounded short gap with original box

American Radio and Research Corporation

AMRAD type D-1 medium wave coupler

American Radio and Research Corporation

1921

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9 lantern slides of diffraction patterns, atomic structure, spectra.

60° fused quartz prism

100g of yttrium dust in sealed glass tube

Acme mounted rectifier, oscillator, and vacuum tube for teaching

ACME Reflex Acmefone radio receiver

Acme type Y-1 vacuum tube radio detector

Ader "bull ring" receiver

Ader "bull ring" receiver

alternating current motor demonstration (?)

aluminum alloy samples in sealed glass jar

AMRAD type 2797 grounded short gap with original box

AMRAD type D-1 medium wave coupler