The Dalton Super Model Adding Calculating Machine: its operation, use and care.

[Cincinnati, OH: The Dalton Adding Machine Sales Co., 1922]. 4to. 48 pp. Numerous photo illustrations, text illustrations, diagrams, 1 printed in red & black. Illustrated tan softcovers, lavender-coloured borders, lozenge cover illust. of Dalton Super Model Machine (minor shelfwear, slight rubbing), still VG bright copy. First edition of this uncommon promotional instruction manual and catalogue for the famed Dalton Adding Calculating Machine, Super Model -- considered to be the first ten key adding machine. Dalton (1866-1926) was a successful amateur mechanic and businessman who was brought into developing the first adding machine by William & Hubert Hopkins who desperately needed money to finance their manufacturing. They set up a company in 1902, but afterwards through some secret and possibly illegal business moves by Hopkins who secretly sold his stock to the Addograph Co., Dalton managed to buy control of all rights to produce and develop adding machines, and patented the invention by 1904. He would often carry a large sample machine with him, fitted with glass sides to show the workings, demonstrating his calculating machine, becoming so successful that by 1922 over 150 models were available and over 50,000 machines sold. After Lewis’ death, the company was sold and merged with Remington-Rand in 1927. Worldcat locates 3 copies (Oakland Pub., MT Hist. Soc., Ohio Hist. Connctn.); See: Dalton Adding Machine - Complete History of the Dalton Adding Machine, History Computer (Oct. 19, 2021); The Computer Museum, No. 106.