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2 Early Electric Motors, c. 1900–20...
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Electromechanical Alternating Current Meter, ...
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Early Electric Motor with Sliding Resistor, c...
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3 Surveying Instruments...
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Early Mining Surveying Compass, c. 1650...
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"Zeitschrift für Vermessungswesen" (Journal f...
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Zeiss Leveling Instrument NI.B., c. 1940...
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German Artillery Gun Range Finder by Banderma...
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Zeiss Universal Theodolite Th.II, c. 1939...
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Receiver for Submarine Signaling Device, c. 1...
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Holtz's Influence Machine and English Resista...
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Sundial, 1854...
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Polarimétre Laurent, c. 1910...
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"Menlo Park Reminiscences", 1937...
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Mining Surveying Compass by Steinberger, 1779...
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Berlin Brass Compound Microscope by Wasserlei...
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English Double-Pillar Microscope, c. 1840...
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Gould-Type Travel Microscope by William Cary,...
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Collapsible English Compass-Type Simple Micro...
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3 Stanhope Magnifiers, c. 1850...
