INTRODUCTION OF THE MODERN ACCOUNTING MACHINE Opposition to the use of machines for accounting 144 Banks more liberal in recognition 145 Improvement slow for first few years 146 THE HIGH-SPEED CALCULATOR Felt improvements on Comptometer 149 Scientific distribution of functions 150 Power consumed by old carrying method 151 Cam and lever carrying mechanism 152 One-point carrying cam impossible 153 Felt’s improved method of carrying 153 Gauging and controlling prime actuation 154 Alternating stop scheme 155 Multiplex key action 156 Control of the carry by the next higher actuator 156 Forced simultaneous key action old 157 Forced simultaneity applied to a calculator impossible 157 Flexible simultaneity of key action a Felt invention 158 Duplex Comptometer 159 Introduction of full-stroke mechanism 159 Error signal keyboard 160 Locking of the other orders by a short key-stroke 161 Inactive keys locked during proper key-action in cash register 161 Inactive keys not locked during proper key-action in “Comptometer” 161 “Controlled-key Comptometer” 162 The mass of recorder inventions patented 163 But few of the recorder patents of value 163 Reserve invention as good insurance 164 Erroneous advertising 164 Error key 166 Sub-total 166 Repeat key 166 Locked keyboard 166 Quick paper return 166 Paper stop 167 Cross tabulating 167 Item stop 167 Motor drive 168 Distinguishing marks for clear, totals, and sub-totals 168 Adding cut-out 168 Self-correcting keyboard 169 Split keyboard 169