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Group 2
The ordinary abacus
The ring abacus
made of silver
Qing Dynasty
49-70 beads
steel needle
traditional Chinese painting of beautiful woman (仕女)
The round abacus
made of red wood
Qing Dynasty
for entertainment
many people calculate at the same time
decoration of the house
The structure of the abacus.
Group 3
two types of abacus
An abacus is an array of beads threaded on string or held in grooves, with each row standing for a different digit(位).
frame
groove
bridge
upper beads
nether beads
a nether bead stand for 1
a upper bead stand for 5
The history of the abacus.
Group 4
Pottery beads in Eastern Zhou Dynasty
3000 years ago
in Shaanxi Province