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I am a retired (astro)physicist who is curious about the history of science and mathematics, and all kinds of ancient computing, measuring or observing instruments used in mathematics, astronomy, geodesy, surveying, navigation, etc. It is not a surprise that I am interested in all kinds of abacuses.
I was a professor at the University of Seville (Spain) for 43 years.
Other personal interests include: Music, flute-making, botany and plant photography.
Jesús Cabrera-Caño
Three items made by myself
A Chinese dotchin (dù chèng 度秤, scale) model, sensitive to 1/4 carat, made out of a bamboo skewer, two fishing sinkers, a beer can bottom, some wire, rope and a miniature eye splice, in the best of New Bedford whalers knoting style, as befits a proud disciple of Clifford W. Ashley!
My first attempt to get my hands on a 3/5 abacus. Made in 2020 spring with the raw materials that I had at home during the seclusion obeying the Stay at Home order due to the coronavirus.
A pseudo random number generator for exercises inspired in this Reihenschieber
European Table Abacus
European Table Abacus
Using 0.01€ coins as counters or "jettons" (Number represented is 1724, or should I say MDCCXXIV?)
Cocos nucifera in Tenerife Island
Cocos nucifera in Tenerife Island
Botanical photography
You can still see some of my photographs in my (now fossilized) gallery on Flickr or by searching on Google.
PVC shakuhachi mouthpieces
PVC shakuhachi mouthpieces
Flute making
This forced me to do a more in-depth study of the acoustic of woodwind instruments, leaving behind several common misconceptions.
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