CONTENTdm Title

Thermopile
This thermopile was obtained by National Bureau of Standards physicist William W. Coblentz in 1906 for his work in radiometry. A thermopile is an instrument used to measure radiant energy by converting heat into an electrical impulse.
NIST Museum Artifacts

Tetrahedral Anvil High Pressure Equipment
This tetrahedral anvil high pressure equipment generated high pressures through application of force by an anvil against the faces of a solid polyhedron. It was developed at the National Bureau of Standards (NBS) as a modification of the high...
NIST Museum Artifacts

Adjustable Sliding Termination for Rectangular Waveguide
This termination serves a variety of purposes in precision microwave measurements, including the calibration of impedance measuring devices and determining the parameters of waveguide junctions. It was developed around 1957 by Robert W. Beatty of...
NIST Museum Artifacts

Evaporative cooling of liquid hydrogen by the bubble-through of helium gas
Photographs; History; Metrology; Low temperatures; Low temperature research
This technique was experimentally investigated by the NBS CEL, and was used by NASA to prevent cavitation in the supply line to the motor of the Saturn I second-stage engine during the pre-launch period at Cape Kennedy in January 1964. This image...
Historic Images

Wenner Type Galvanometer
This taut-suspension type galvanometer was designed by Frank Wenner in 1910. Dr. Frank Wenner was a physicist at the National Bureau of Standards (NBS) from 1907-1943, and was chief of the NBS electrical resistance measurement section. In this...
NIST Museum Artifacts

Tangent Galvanometer
Galvanometer; Radiometry; Electric currents; Electricity
This tangent galvanometer was purchased from the Western Electric Company probably in the 1890s and turned over to the National Bureau of Standards in 1902. It has a long magnetized needle pivoted at the center of a slender circular coil about 6...
NIST Museum Artifacts

Surveyor's Rule
This surveyor's rule was used by Ferdinand R. Hassler during the survey the U.S. Atlantic Coast in the early nineteenth century. Hassler, a Swiss immigrant, was appointed as the first Superintendent of the Survey of the Coast by President Madison...
NIST Museum Artifacts

Survey of Research for Performance Measurement of Mobile Manipulators
mobile manipulator; performance measurement; standard; survey; test method
This survey provides the basis for developing research in the area of mobile manipulator performance measurement, an area that has relatively few research articles when compared to other mobile manipulator research areas. The survey provides a...
Journal of Research of NIST and Predecessor Publications

R. P. Reed of the NBS staff adjusting the electron microscope during a study of metal behavior at cryogenic temperatures
Photographs; History; Metrology; Low temperatures; Low temperature research; Instruments; Laboratories
This study was made to determine growth patterns, lattice parameters, and final orientations of martensite transformations. This image is part of the Cryogenics collection. The National Bureau of Standards’ (NBS) interest in cryogenics (the...
Historic Images

Probe-position error correction in planar near-field measurements at 60 GHz - experimental-verification
error correction; experimental verification; planar near fields; probe-position errors
This study was conducted to verify that the probe-position error correction can be successfully applied to real data obtained on a planar near-field range where probe position errors are known. Since probe position-error correction is most...
Journal of Research of NIST and Predecessor Publications

In vitro and in vivo characteristics of fluorapatite-forming calcium phosphate cements
animal study; biocompatible; fluorapatite-forming calcium phosphate cements; high crystallinity; non-resorbable
This study reports for the first time in vitro and in vivo properties of fluorapatite (FA)-forming calcium phosphate cements (CPCs). The experimental cements contained from (0 to 3.1) mass % of F, corresponding to presence of FA at levels of...
Journal of Research of NIST and Predecessor Publications

Digital image analysis assisted microradiography - measurement of mineral content of caries lesions in teeth
demineralization; dental caries; digital image analysis; microradiography; remineralization; tooth mineral
This study investigated the feasibility of using a digital image analysis system to process the information contained in microradiographs of tooth sections that included dental caries lesions. The results show that by using an aluminum step wedge...
Journal of Research of NIST and Predecessor Publications

Preparation and properties of nanoparticles of calcium phosphates with various Ca/P ratios
calcium phosphate; Ca/P ratio; ion activity products (IAP); nanoparticle; solubility; spray drying
This study aimed at preparing and studying the properties of nanoparticles of calcium phosphate (nCaP) with Ca/P ratios ranging from 1.0 to 1.67 using a spray-drying technique. Micro-structural analyses suggested that the nCaPs with Ca/P ratios of...
Journal of Research of NIST and Predecessor Publications

Whittemore Strain Gauge
This strain gauge was invented around 1926 at the National Bureau of Standards by mechanical engineer Herbert L. Whittemore. This instrument was designed for the Committee on Arch Dam Investigations at the request of the Engineering Foundation. It...
NIST Museum Artifacts

Whittemore Strain Gauge
This strain gauge was invented around 1926 at the National Bureau of Standards by mechanical engineer Herbert L. Whittemore. This instrument was designed for the Committee on Arch Dam Investigations at the request of the Engineering Foundation. It...
NIST Museum Artifacts

Standard Meter Bar
This steel end standard meter bar was one of several in storage in the South Building of the National Bureau of Standards (NBS) Washingtion, D.C. campus until 1963. The NBS numbers by which some are inventoried indicate they were turned over to NBS...
NIST Museum Artifacts

Standard Meter Bar
This steel end standard meter bar was one of several in storage in the South Building of the National Bureau of Standards (NBS) Washingtion, D.C. campus until 1963. The NBS numbers by which some are inventoried indicate they were turned over to NBS...
NIST Museum Artifacts

Standard Meter Bar
This steel end standard meter bar was one of several in storage in the South Building of the National Bureau of Standards (NBS) Washingtion, D.C. campus until 1963. The NBS numbers by which some are inventoried indicate they were turned over to NBS...
NIST Museum Artifacts

Standard Bars (meters)
This steel end standard meter bar was in storage in the South Building of the National Bureau of Standards (NBS) Washington D.C. campus until 1963. The NBS numbers by which similar bars were inventoried indicate they were turned over to NBS in...
NIST Museum Artifacts

Steam Calorimeter
This steam calorimeter, used for measuring the thermal conductivity of refractory materials, was developed at the National Bureau of Standards by Hobart C. Dickinson around 1946, and remained in use until 1961. Using this device, the rate of heat...
NIST Museum Artifacts

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