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Dr. Harry H. Mark
local time: 2022-08-14 20:22 (-04:00 DST)
Dr. Harry H. Mark (Abstracts)
Titles Abstracts Details
  • Speed of Light in Historical Perspective (2011) [Updated 1 decade ago]
    by Harry H. Mark   read the paper:

    Three pivotal empirical measurements determined the speed of light in relation to a moving observer or its source.

    1. Ole Roemer (1644-1710) found that the speed of light from Jupiter's satellite was lower when an observer on earth was moving away from it, and higher on approach. The red-shift of spectral lines may be understood in this context.
    2. James Bradley (1693-1762) determined that the speed of light from the star Gamma draconis was higher when an observer on earth moved towards its perpendicular incident, and lower on recession. George Biddell Airy attempted to elucidate the data with a water filled telescope.
    3. Albert Michelson (1852-1931) measured the speed of light when both the source and the observer were on the same moving earth. Under these circumstances the speed did not change. The experiment was interpreted to mean that the speed of light was not affected by the motion of the earth. However, the results published in the 1881 paper were then amended, on the advice of Alfred Potier (1840-1905), in a second paper, published with Edward Morley in the 1887. In this paper the speed in the perpendicular direction was increased, in the spirit of Bradley's observation of aberration, and this correction diminished the expected discrepancy by half. The speed in direction of the earth's motion, in the spirit of Roemer's data, was not similarly considered.

    All the above data indicated that the speed of light was affected by the speed of the frame of reference.


  • On Linear Motions in Moving Frames (2008) [Updated 1 decade ago]
    by Harry H. Mark   read the paper:

    Introduces the development of our general knowledge on referred motions.


  • From Maxwell to Michelson: On the Road Less Travelled to an Experiment (2008) [Updated 1 decade ago]
    by Harry H. Mark   read the paper:

    Details the specific position of light in this area of kinematics.


  • The Reciprocity of Refraction (1982) [Updated 1 decade ago]
    by Harry H. Mark   read the paper:

    Reproduced from Optokinetics, a Treatise on the Motions of Lights (1982), pp. 107-113.


  • Red Shift (1982) [Updated 1 decade ago]
    by Harry H. Mark   read the paper:

    Reproduced from Optokinetics, a Treatise on the Motions of Lights (1982), pp. 144-149.