Welcome at the Wikiversity Learning Project on the Allais effect, a Physics subproject related to the Theory of Everything Project.
Review table of the different eclipse experiments
|M. Lion||July 28, 1851||Beaune, France||Compass||"D'après cet ensemble d'observations pendant l'éclipse, le nombre des oscillations s'est régulièrement accru, annonçant une augmentation de tension magnétique, tandis qu'à tout autre moment le nombre des oscillations resta constant."|
|M. Allais||June 30, 1954||Saint-Germain-en-Laye, France||Paraconical pendulum||"The plane of oscillation of the paraconical pendulum approximately shifted 15 centesimal degr. during the eclipse." |
|M. Allais||October 2, 1959||Saint-Germain-en-Laye, France||Paraconical pendulum||"An analogous perturbation of amplitude approximately 10 grads has been observed" |
|G. T. Jeverdan et al.||February 15, 1961||Iasi, Romania||Foucault pendulum||The oscillation period of the pendulum decreased by about 1 part in 2000 – the so-called ‘Jeverdan effect’, but his report was not published in a mainstream English-language scientific journal.|
|L. Slichter et al.||February 15, 1961||Florence, Italy||Gravimeter||"Gravity observations during the solar eclipse of February 15, 1961, failed to detect an associated gravitational signal" |
|E. J. Saxl and M. Allen||March 7, 1970||Harvard, Massachusetts||Torsion pendulum||Increase in the period of a torsion pendulum during the solar eclipse: "Quantitative observations made with a precise torsion pendulum show ... that the times required to traverse a fixed fraction of its total angular path vary markedly during the hours before the eclipse and during its first half, i.e., up to its midpoint." |
|R. Latham||June 20, 1974||Perth, Australia||Gyroscope and electronic level||"No eclipse effect was noticed of a form suggested by the observations of Allais and Saxl & Allen (with the gyroscope)... To monitor a possible change in the direction of "g" we took a Taylor Hobson "Talyvel" electronic level, mounted it on the gyroscope turntable and monitored a possible E/W change of direction of "g". Such an effect was observed, and a large one (5 secs of arc)..." |
|R. Latham||August 10, 1980||Lima, Peru||Gyroscope and electronic level||"...the experiments could possibly be consistent with an eclipse couple, though the fluctuations prevent a firm decision being reached. With regard to the Talyvel effect at Perth the results are quite definite. Such an effect was not observed at Lima." |
|T. Kuusela||July 22, 1990||Turku, Finland||Torsion pendulum||"Contrary to previous experiments, no increase in the period was observed" .|
|Jun et al.||July 22, 1990||Bielomorsk, Russia||Torsion pendulum||"We cannot say what possible systematic error or errors would account for the results of Saxl and Allen, but to the limit of our experimental sensitivity, there is no observed anomalous period increases of the torsion pendulum during the solar eclipse at a level much smaller than the effect they reported."|
|J. Kääriäinen||July 22, 1990||Lohja, Finland||Water level||"no gravitational shielding was found at the level of the above accuracy."|
|J. Mäkinen||July 22, 1990||Finland||Gravimeter||No effect detected|
|K. Ullakko et al.||July 22, 1990||Helsinki, Finland||Torsion pendulum||No effect detected|
|T. Kuusela||July 11, 1991||Mexico City||Torsion pendulum||"In our experiment no significant change was found as the relative change in the period associated with the eclipse was less than 2.0×10−6 (90% confidence) ... However, two small but distinct shifts were observed in the horizontal position of the pendulum wire which were well correlated with the beginning and the end of the eclipse."|
|L. Savrov||July 11, 1991||Mexico City||Paraconical pendulum||"it is clear that the sharp deviation of the azimuth of the plane in which the pendulum swings by 12° at the start of the eclipse (first contact) is noteworthy". "The variation in the rate of rotation during the eclipse ... proves to be three times greater than the local Foucault effect." "... the Foucault pendulum responded to the remanent shock wave at the maximum of the total eclipse phase, and the rate of rotation of its oscillation plane changed"|
|M. Denis||July 11, 1991||Mexico City||Paraconical pendulum||Variation of the rate of rotation of the Foucault pendulum's plane of swinging|
|Zhou S. W. et al.||December 24, 1992||China||Atomic clocks||The influence of the solar eclipse on the rate of atomic clocks has been observed although the effect of this solar eclipse was very weak.|
|L. Savrov||November 3, 1994||Pato Branco, Brazil||Paraconical pendulum||"an increase in the rate of rotation of the pendulum's oscillation plane in the direction of the Foucault effect was observed in the Brazilia-94 experiment, just as had been observed in the Mexico-91 experiment, though its magnitude was only one-fifth that of the latter experiment."|
|Mishra and Rao||October 24, 1995||Dhoraji, Saurashtra, India||Gravimeter||"A one hour feature of the gravimeter record] of 10-12 microGal (10-8cm/s2)...can neither be classified under short period variations due to tidal effect or drift of the gravimeter nor under high frequency noise which have special patterns. Therefore, this variation is highly significant as it occurs with the onset of an eclipse"|
- July eclipse is best chance to look for gravity anomaly New Scientist, 19 July 2009 by Phil McKenna
Miller's interferometer experimentsEdit
Esclangon space dissymmetryEdit
Ernest Esclangon performed continuous autocollimation experiments in the northwest and northeast direction and noticed a sidereal periodicity in the measured values. The experiment with results is described in the following references:
- Compte-Rendus Académie des Sciences, 1927, T185, p.1595-1597.
- Journal des Observateurs, 1928, vol XI, p.49-63.
The observation data of Esclangon are here.
Paraconical pendulum experimentsEdit
- Moïse Lion, “Observations relatives à l’intensité du magnétisme terrestre, faites à Beaune, pendant l’éclipse du 28 juillet,” Comptes Rendus de l’Académie des Sciences de Paris, vol. 33, pp. 202–204, Aug. 1851.
- Maurice Allais, Should the Laws of Gravitation be Reconsidered?, Aero/Space Engineering 9, 46–55 (1959)
- Maurice Allais, "Maurice Allais, L'Anisotropie de l'Espace ("The Anisotropy of Space"), Clement-Juglar, 1997
- G. T. Jeverdan, G. I. Rusu and V. I. Antonescu, "Date preliminare asupra comportarii unui pendul Foucault in timpul eclipsei de soare de la 15 februarie 1961", Analele Stiintifice ale Universitatii "Al. I. Cuza" of Iasi, section I, tom VII, anul 1961, Fasc.2, p. 457
- Slichter L. B., Caputo M. and Hager C. L., An experiment concerning gravitational shielding, Journal of Gravitational Research 70, 1965, 1541-1551
- Saxl E. and Allen M., 1970 solar eclipse as "seen" by a torsion pendulum, Phys. Rev. D, vol. 3, no. 4, pp. 823-825 (1971)
- R. Latham, An Interim report on a repeat of the Allais Experiment – the measurement of the rate of increase of the minor axis of a Foucault pendulum using automatic apparatus, Imperial College, London, Imperial College Report ICR G 28, Jan. 1980.
- R. Latham, Gyroscopic Couple and ‘Talyvel’ Level Measurements made at Lima (Peru) during and around the time of the Solar Eclipse of August 10th, 1980, Imperial College, London, Imperial College Report ICR G 29, Sep. 1980.
- Kuusela T., Effect of the solar eclipse on the period of a torsion pendulum, Phys. Rev. D 43, 2041–2043 (1991)
- Jun, Luo, et al. "Observation of 1990 solar eclipse by a torsion pendulum." Phys. Rev. D 44.8 (1991): 2611-2613.
- Kääriäinen, Jussi, Clinometric records with two long water levels in Lohja, Finland, during the total solar eclipse in 1990, Bulletin Géodésique, Volume 66, Issue 3, pp.281-283
- Mäkinen, J.: 1990, Absolute gravity measurements during the July 22, 1990 total solar eclipse inFinland, Bull. Inf. Gravimet. Int. 67, 205–209.
- Ullakko, K.; Liu, Yong; Xie, Zeliang, The 1990 solar eclipse as seen by a torsion pendulum; In Oulu Univ., Proceedings of the 25th Annual Conference of the Finnish Physical Society, 1991, p.184
- Kuusela, T. "New Measurements with a Torsion Pendulum during the Solar Eclipse." General Relativity and Gravitation 24.5 (1992): 543-50.
- Savrov, I. A. "Paraconical pendulum as a detector of gravitational effects during solar eclipses (processing data and results).", Measurement Techniques, Vol. 38, No. 3, p. 253 - 260 (03/1995)
- Savrov, L. A. "Improved determination of variation of rate of rotation of oscillation plane of a paraconic pendulum during the solar eclipse in Mexico on July 11, 1991." Measurement Techniques 52.4 (2009): 339-343.
- Denis, M., Cahiers du Centre européen de géodynamique et de séismologie, 4, 33, 1992
- Zhou, S. W., B. J. Huang, and Z. M. Ren. "The abnormal influence of the partial solar eclipse on December 24th, 1992, on the time comparisons between atomic clocks." Il Nuovo Cimento C 18.2 (1995): 223-236.
- Savrov, L. A. "Experiment with paraconic pendulums during the November 3, 1994 solar eclipse in Brazil." Measurement Techniques 40.6 (1997): 511-516.
- D. C. Mishra and M. B. S. Vyaghreswara Rao, “Temporal variation in gravity field during solar eclipse on 24 October 1995,” Current Science, vol. 72, no. 11, pp. 782–783, Jun. 1997.