|
|
|
|
|
|
The binary system uses 0 and 1, whereas the decimal system uses 0 to 9. This abacus has four registers to hold 12 bit binary numbers. It is possible to multiply numbers with this many registers (but please don't ask me how - try any well known search engine). It is fully hallmarked and weighs about 160g - mainly the silver. The beads are black onyx.
See also http://en.wikipedia.org/wiki/Abacus.
|
|
|
This is the big brother of the one above - similar except it has 16 beads per register.
It was presented to Carlo Vandoni by the Eurographics Committee at the 2011 Conference in Bangor in April 2011. The sycamore platter was turned by Richard Shock and Gilly Middleburgh did the calligraphy.
"Carlo was absolutely delighted with the abacus, as were the other members of the committee. Many thanks for this it was really very much appreciated."
|
|
|
This abacus is formed from square section and round wire. The beads are black onyx. Ruby cabochons are mounted in fine silver bezels on the top bar. The abacus is about 9 cm wide. An early piece that I could finish better now.
The item was made for the ruby wedding of my parents-in-law with the idea of 40 years - but who's counting! |
