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Display: 20

    • Vernier Compass

    • Vernier Compass
    • Hassler, F. R. (Ferdinand Rudolph), 1770-1843; United States Coast Survey; Metrology; Weights and measures; Compass
    • This vernier compass was used by Ferdinand R. Hassler to survey the U.S. Atlantic Coast in the early 19th century. Hassler, a Swiss immigrant, was appointed as the first Superintendent of the Survey of the Coast by President Madison in 1816. Many...
    • NIST Museum Artifacts
    • Variable Inductor

    • Variable Inductor
    •  
    • This Variable Inductor was designed and constructed at the National Bureau of Standards in 1911 by Herbert B. Brooks, F.C. Weaver, and Joseph Ludewig. The need for this instrument arose from the Bureau’s work testing current transformers. The...
    • NIST Museum Artifacts
    • Observation Tube for Oxide Cathode

    • Observation Tube for Oxide Cathode
    •  
    • This vacuum tube was used by National Bureau of Standards physicist Ralph Forman around 1954 to make Hall effect and electrical conductivity measurements on an oxide cathode over the temperature range 500 to 1000 Kelvin.
    • NIST Museum Artifacts
    • Unsaturated Standard Cell

    • Unsaturated Standard Cell
    • Electricity
    • This unsaturated cadmium standard cell was manufactured by the European Weston Electric Instrument Co. of Berlin, Germany. It was one of a group which had been measured at the Physikalisch-Technische Reichsanstalt (PTR) and brought to the National...
    • NIST Museum Artifacts
    • Resistor

    • Resistor
    •  
    • This type of resistor was developed by the Physikalisch-Technische Reichsanstalt (PTR) and fabricated by O. Wolff. It was notable for its use of manganin wire. A group of similar resistors was used to establish the U.S. reference standard in 1907....
    • NIST Museum Artifacts
    • 2-dial Standard Capacitor

    • 2-dial Standard Capacitor
    • Electricity
    • This two-dial standard capacitor made around 1935 by Leeds & Northrup Co. is typical of the precise, high-range capacitors of that period. The fixed steps are air capacitors and the fine adjustment dial is a parallel-plate air capacitor. It has 12...
    • NIST Museum Artifacts
    • Radiation Balance Microcalorimeter

    • Radiation Balance Microcalorimeter
    •  
    • This twin microcalorimeter (also known as a radio balance) was used to make precise comparisons between radioactive samples held in two small cylindrical copper (or gold) �cups� by using Peltier-effect cooling to balance the rate of energy emission...
    • NIST Museum Artifacts
    • Tripod Head for Surveyor's Compass

    • Tripod Head for Surveyor's Compass
    •  
    • This tripod head was used by Ferdinand R. Hassler during the first survey of the U.S. Atlantic Coast in the early 19th century. Hassler, a Swiss immigrant, was appointed as the first Superintendent of the Survey of the Coast by President Madison in...
    • NIST Museum Artifacts
    • Transit No. 3

    • Transit No. 3
    •  
    • This transit is a surveying instrument that was apparently used by the Coast Survey (later known as the U.S. Coast & Geodetic Survey). Identified as No. 3, the transit was either made or bought by the Coast Survey in the 19th century. It is said...
    • NIST Museum Artifacts
    • Dynamic Compressibility Transducer Assembly

    • Dynamic Compressibility Transducer Assembly
    • transducers; piezoelectric transducers; Polymers
    • This transducer assembly was used in conjunction with the dynamic compressibility apparatus which measures the complex (frequency dependent) compressibility of materials over a range of temperature (-30 to 100 Celsius), static pressure (1 to 1000...
    • NIST Museum Artifacts
    • Resistance Box

    • Resistance Box
    •  
    • This three-dial resistance box, made by Leeds and Northrup for general laboratory use, was purchased about 1914. The dials have settings of 1000s, 100s and 10 ohms respectively. Each decade is made up of four coils, having values proportional to...
    • NIST Museum Artifacts
    • G.E. Inclined Coil Type Ammeter

    • G.E. Inclined Coil Type Ammeter
    •  
    • This Thomson a-x Ammeter, G.E. type P Serial No. 46752, was purchased from the General Electric Company in 1902. It is of the inclined coil type invented by Elihu Thomson. The coil carrying the current to be measured is mounted with its axis...
    • NIST Museum Artifacts

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