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  • A Buyer’s and User’s Guide to Astronomical Telescopes & Binoculars
    The heating element is typically encased in an elastic nylon strip with Velcro for attaching it around the various optical surfaces and is operated from a 12 - volt DC source such as a car battery or power supply.
  • Physics
    … constant, 1417 discharge through ground 721, 656 gas discharge, glow discharge, entropy, 614, 626 absolute, 623 energy-devaluation, 626 energy-availability, 620 Nernst'sches heat theorem, 623, 626 temperature … … see 85 earth age, 12 , the Binomial development earth web , 131 gravitational acceleration, 54 … … Bernoulli-beam theory, 359 Euler'sche number, 1399, 1415 euro plugs 656 eV (electron volts ) 1272, 161, 169 …