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I’m flying to Chicago on Wednesday.  There’ll be an unusual object in my luggage (is it wise to put that kind of statement online?).  Yes, you guessed it: it’s another equatorium. Loyal readers will remember my early series of posts (here, here and here) in which I described how I made, and learned to use, a medieval equatorium.  Although I am no great artist, I managed to create a passable replica of the instrument described in the manuscript I'm studying.  In the process

In my first post I described how I began making an equatorium according to the instructions in the fourteenth-century manuscript I’m researching.  Since writing that post, I discovered a full-size replica made in the 1950s (you can read about that here).  Needless to say, that replica is far more attractive and probably more accurate than anything I can make at home with my saw and pencil, but I never said beauty or accuracy were priorities of mine.  So I went ahead with my o