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The following photographs will give you a perspective on the development of the Guarded-Hot-Plate Apparatus at NIST.
| 1.Final version of NIST guarded-hot-plate apparatus built in 1929 by Van Dusen. | 2. Chock Siu (sitting), Frank Powell (l), and Tom Watson in front of 1929 NIST guarded-hot-plate apparatus (1973) | 3. Prototype Robinson line-heat-source guarded- hot-plate apparatus (1978). |
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| 4. The circular "hot plate" being installed by Research Associate Dave Ober (l) and mechanical engineer Mahn Hee Hahn. | 5. Technicians John McAuley (l) and Rick Petersen instrument the new 1000-mm guarded hot plate. | 6. NIST one-meter line- heat-source guarded-hot-plate apparatus (1980). |
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