Other editions - View all
A. N. vol absorption coefficient acoustic aether aggregate applied beam Berlin Bureau of Public cement charge circuit components Cooperating agency crystal curl Date of beginning defined definition density determine dielectric DISTRICT OF COLUMBIA doublet effect electric electric charges electromagnetic electromotive force electron electrostatic elements energy Engineering ephemeris equations experimental experiments expression Findex fluorescent force frequency gravel Highway Commission Highway Department ILLINOIS integral investigation Iowa J. J. Thomson Jupiter kinetic energy Laboratory material measurements mechanical method motion moving National Research Council observations obtained orbit pavement perturbations Phil photoelectrons Phys planets Portland Cement potential problem Proc psychology Public Roads quantities quantum radiation rays relation represent rotating sand scattering secondary slabs sound subgrade surface surface integral tests theory tion traffic U. S. Bureau University vector velocity volume W. H. Bragg wave wave-length X-rays y-rays zero
Page 55 - Number 35. Apparatus used in highway research projects in the United States. Results of census by Advisory Board on Highway Research, Division of Engineering, National Research Council, in cooperation with the Bureau of Public Roads, United States Department of Agriculture.
Page 81 - No mere rotation of a bar-magnet on its axis produces any inductive effects on circuits exterior to it. The system of power about the magnet must not be considered as revolving with the magnet any more than the rays of light which emanate from the sun are supposed to revolve with the sun. The magnet may even, in certain cases, be considered as revolving amongst its own forces, and producing a full electric effect sensible at the galvanometer.
Page 45 - Number 2. Research laboratories in industrial establishments of the United States of America. Compiled by ALFRED D. FLINN. March, 1920. Pages 85. Number 3. Periodical bibliographies and abstracts for the scientific and technological journals of the world.
Page 45 - Rontgen' tried unsuccessfully to obtain refraction by means of prisms of a variety of materials such as ebonite, aluminium and water. Perhaps the experiment of this type most favorable for detecting refraction was one by...
Page 21 - ... the charge and mass of the electron, and c the velocity of light. Using moderately soft X-rays and carbon for the radiating material, Barkla and Ayers2 1 JJ Thomson, "Conduction of Electricity through Gases,
Page 64 - A number of tests have been made on concrete containing different amounts of shale and subjected to alternate freezing and thawing conditions. Methods of separating shale from pebbles have been investigated.