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from article Marjoram
Close-up view of marjoram (Majorana hortensis; alternatively Origanum majorana). (Photo courtesy of Forest and Kim Starr)
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from article Boiling
Typical boiling curve, showing qualitatively the dependence of the wall heat flux q on the wall superheat ΔT, defined as the difference between the wall temperature and the saturation temperature of the liquid. Schematic drawings show the boiling…
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from article Boiling
Effect of external forced flow, at low and high velocity, on the boiling heat curve. The maximum heat flux is increased and the natural convection curve is shifted up due to forced convection. Locations of points A and C in Fig. 1 are indicated.
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from article Spin-density wave
Types of spin-density wave observed in metals: SS = spiral (helical); FS = ferromagnetic (cone); = skewed; LSW = longitudinal; TSW = transverse; FAN = stable only in a magnetic field B in the direction shown.
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from article Prehistoric technology
Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…
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from article Prehistoric technology
Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After…
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from article Prehistoric technology
Potters from the village of Harappa, Pakistan, display their wares in front of a replica of a two-chambered kiln used by ancient potters in the Indus Valley civilization. (Photo courtesy of R. P. Wright)
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from article Pitot tube
Pitot tubes. (a) Original form. Symbols explained in text. (b) Modern shielded Kiel probe.
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from article Thermistor
Bridge circuit for measuring radio-frequency power by use of a pair of thermistors.
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from article Aerodynamic sound
Separate-flow high-bypass-ratio jet engine.
