A website in English about Maurice Allais and the Eclipse Effect

This page you are looking at (along with its subsidiaries) is now in the throes of being moved to its own classy URL at


so please change your bookmarks!

Initially, I created this website in order to present my translations of Allais-related documents from French into English. Now I am starting to put some of my own opinions and ideas about the Eclipse Effect up here. Click here for my preliminary ideas. But I would emphasize that the translations below are much more important.

My first translation is the legendary 84 page Allais-to-NASA memoir of 1999:

Click Here for the Nasa Memoir download page.

Pictures: I think I have done something useful: here are decent scans of the four available photos of Prof. Allais's paraconical pendulum apparatus. Other versions of these pictures are available elsewhere on the internet, but these are better. When printed, each on a full sheet, the experimental setup is quite clear. One could wish for engineering drawings and description, and for detail pictures.... but these are a good start. Just click here for the Pictures page.

My next and ongoing project is to translate the ten notes by Allais from 1957 to 1960 to the French Academy of Sciences, in which he describes his experiments and various associated issues clearly and concisely. These are technical scientific papers, and the information density and assumed audience educational level are high. No effort is made to ease the reader's task.

Click Here for the Notes download page. WARNING: You can only get four of the English versions at the moment (because I haven't finished the rest of the translations). However, you can get the French versions of all ten of these Notes.

(1) Prof. Allais's many writings refer to one another in many places, usually by page number. Changing these references would be a difficult and open-ended task. Accordingly I take some pains to preserve the pagination of the original French documents.

(2) In all his voluminous work on the pendulum, Prof. Allais uses an idiosyncratic angular unit, the "grade". 400 grades equal one full turn, so 100 grades are equal to a right angle. He also occasionally uses centesimal minutes and seconds which are respectively hundredths and ten-thousandths of these grades. Whatever may be the merits of this system, it is not conventional, at least in modern work presented in English. However I have not attempted to eliminate these grades in the translations, because they are deeply embedded in the tables and graphs, and all Prof. Allais's angular results are expressed in terms of grades.


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