Three (3) 19th century Shrinkage/Slide Rules, George III Perpetual Calendar. 1st item: Thomas Webb, Bristol two-fold shrinkage rule, comprised of two (2), two-sided wooden rule with mathematical notations, connected by a central brass hinge with inlaid central brass band and connectors, metal tips. Marked "T. Webb Maker Bristol" to one edge. Closed – 12 5/8" L. Opened – 21 1/8" L. 2nd item: George III silver perpetual calendar and pencil holder, cylindrical form with raised band of line decorations with mounted onyxseal reading "IF YOU/PERISH/I PERISH" to top, perpetual calendar below with fluted holder pencil at the base. Unmarked. Includes modern yellow Dixon pencil. 3 5/8" L excluding pencil. 3rd item: Brass Nautical Circular slide rule, comprised of a raised central handle with movable indicator and three movable rings withlongitude and latitude coordinate scale notations, all mounted a round base. Unmarked. 1 3/4" H x 5 5/8" dia. Provenance: Private West Tennessee Collection. CONDITION: All items with wear to be expected from age and manner of use. Tarnish to brass. 1st item: Slight separation of brass band to wood. Areas of loss, largest 1/4", to wood. White residue to metal tips.