EARLY EFFORTS IN THE RECORDING MACHINE ART First attempt to record arithmetical computation 79 Description of Barbour machine 80 Barbour machine not practical 81 Description of Baldwin machine 82 Baldwin’s printing mechanism 89 First key-set crank-operated machine and first attempt to record the items in addition 90 Description of Pottin machine 91 Early efforts of Wm. S. Burroughs 95 General scheme of Burroughs’ first inventions 96 Brief description of machine of early Burroughs’ patents 97 All early arithmetical printing devices impractical 101 Practical method for recording disclosed later 102 Inoperative features of early recording mechanism 105 Adding mechanism attached to typewriter 105 Description of Ludlum machine 106 Ludlum machine inoperative 108 FIRST PRACTICAL RECORDERS Burroughs a bank clerk 111 Felt interested in recorder Art 111 Felt’s first recording machine 113 Felt recording mechanism combined with his calculating machine 113 Description of Felt’s first recorder 114 First individualized type impression combined with printing sector 115 First practical arithmetical recorder 116 The first sale of a recording adding machine on record 116 Features of first practical recorder 119 Description of Felt’s second recorder 120 Felt principle of printing adopted by all manufacturers of recorders 124 Wide paper carriage for tabulating 124 The wide paper carriage machine 127 Litigation on tabulator patents 127 “Cross Tabulating” 128 Felt recorder in “Engineering” of London, England 131 Total recording a Felt combination 131 Legible listing of items and automatic recording of totals first achieved by Felt 132 The key-set principle more practical for recorders 135 Description of first practical Burroughs recorder 137 Date of use of first practical Burroughs recorder 140