Abacus
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An instrument for performing arithmetical calculations by means of sliding balls or counters.
Source
Kantner Book of Objects141
Downloads
2400×1087, 472.3 KiB
1024×463, 64.3 KiB
640×289, 30.4 KiB
320×144, 12.9 KiB
An instrument for performing arithmetical calculations by means of sliding balls or counters.
Kantner Book of Objects141
2400×1087, 472.3 KiB
1024×463, 64.3 KiB
640×289, 30.4 KiB
320×144, 12.9 KiB