|
|
This is a cylindrical pocket slide rule with helical scales 66 inch long to add subtract multiply and divide numbers, made in England by Carbic ltd., London in the 1960s. The model K has spiral logarithmic scales on the holder and cylinder sections. This slide rule is a type C, model K, with scales 414 and 423 and serial number A9759, It is in very good condition in its original box with original 8 page instruction book |
|
