...next cool tool:S.P.KOROLEV's slide rule.... π
http://img412.imageshack.us/img412/98/1357348333259f17bc30ooq4.th.jpg
http://img412.imageshack.us/images/thpix.gif
http://img509.imageshack.us/img509/5765/korolevku2.jpg
http://img407.imageshack.us/img407/419/428rkk16884061718359fq0.jpg
F