From the Computing History Collection of Serge Roube, via his Estate

A FULLER'S SPIRAL CYLINDRICAL SLIDE RULE CALCಌULATO☂R

Stanley & Co., London, circa 1921

A 17 inch long hand-held cylindrical slide rule calculator, No 4624, with 6 ½ inch long sliding drum scales, lacquered brass reading bar, mahogany caps and handle. Housed in the original fitted case with brass holding bracket, lid of case with paper manufacturer's label. With: FULLER, George Professor Fuller's Calculating Slide Rules... Instructions for the Use of the Rule.  London: W.F. Stanely & Co., 1916.

Patented in 1878, the Fuller Calculator was the the most advanced calcul🥀ating tool of its time, with its innovative cylindrical design allowing it the✃ same calculating power as a more than 80 foot long straight slide rule. 

LITERATURE:

Wayne E. Feely, "The Fuller Spiral Scale Slide Rule," Chronicle of the Early American Industries Association 50, no. 3 (1997): 93–98