Disclaimer:This page is not my main page, and I don't have a main page (home page) (anymore). I used to have one, but the pages and information have multiplied and become scattered. I have therefore given up on having a "main" page. I try instead to connect the different pages together.

I therefore provide links here to a (non-exhaustive) list of sites containing elements of my activities and work. Other pages may be more complete, or some may be incomplete. It is also possible that the information on this page may at some point be transferred elsewhere, in whole or in part (this may depend on GitHub, for example). It's complicated, I know, but I don't have the time to do better.

I also don't have time to waste making a sales presentation; it serves absolutely no purpose for me.

So, my main general pages are:

• My (very incomplete) professional page at LORIA.
• My independent researcher page (also very incomplete).

As you can see, my activities cover two main themes which are roughly correlated with my roles as a professional researcher and an independent researcher.

Professionally, I do a lot of research on the history of mathematics, the history of computation, particularly numerical tables, but also on mechanical computation and other types of computations. I am also interested in modeling, not only in 3D. Much of my professional research (but not only) is grouped on the following page:

• the LOCOMAT project (with among others some of my work on mechanical computation)

At the independent level, I do much the same thing, but by applying it to scientific and technical heritage, which I study, analyze, compare, document, and campaign for its preservation. This is not, contrary to what some people think, separate from my professional activity. I recently received the Alan Shenton Award for this work.

It turns out that I've examined a lot of machines, such as tower clocks (they're pretty much the simplest kind of machines) and I've also worked extensively in archives (but also for my work in the history of mathematics), and I've made correlations between works and their archives. I have been led to work on museum collections or on works tied to heritage administrations, etc., which has led me to (request) access to archives. Like any self-respecting researcher, I also have to do critical work, and this work greatly displeases certain curators in heritage administrations or museums who, in fact, don't understand what I do.

Here are some more recent, more specific pages:

• My 3D model of the former clock at the Paris Notre-Dame cathedrale.
  • youtube channel and Android application (obtain the application directly, without going through the PlayStore, or on apkcombo, apkpure, steprimo, or apkgk)
  • interactive exploration of the clock
• My page on Schwilgué's 1821 computus, whose study and disassembly/cleaning/reassembly I organized in 2023.
• My coverage of the stained glass windows of Strasbourg Cathedral (Summer 2023).
• My book on the paintings of the astronomical clock of Strasbourg Cathedral, 2024
• The theses in computer science in Nancy from 1960 to 1990
• My book on the astronomical clocks described by Ludwig Oechslin in 1996, 2025.

Recent additions

Last change: 18 October 2025.