A 21-rod abacus?! Hey, now that's cool! Only ones I've ever seen were of the 13-rod variety. No, I take that back. I've seen a Japanese one where the beads didn't stay put...faster movement, but not very good for blind folks...and it was really long! I don't remember how many rods it had. Also saw a Chinese abacus which I guess was numbered in hex! (It had two 5's and five 1's...hehe) I have two standard Cranmer abacuses 9abaci?) around here, both of which have the odd loose column...maybe I'll replace one of them one of these days. -- Buddy Brannan, KB5ELV | From the pines down to the projects, Email: davros at ycardz.com | Life pushes up through the cracks. Phone: (972) 276-6360 | And it's only going forward, ICQ: 36621210 | And it's never going back.--Small Potatoes