crwdns2933803:04crwdne2933803:0
crwdns2933797:0robertcbaruchcrwdnd2933797:0crwdne2933797:0
- crwdns2933769:0crwdne2933769:0
- crwdns2933771:0crwdne2933771:0
- crwdns2933801:0crwdne2933801:0
crwdns2933807:0crwdne2933807:0
| [* black] Turning the zeroing crank counterclockwise sets the counter digits to zero, while turning it clockwise sets the accumulator digits to zero. Amazing! | |
| [* black] Nelson White's 1920 patent [http://www.google.com/patents?id=lARhAAAAEBAJ|Zero-setting mechanism] describes how this amazing thing works. | |
| - | [* black] This amazing thing practically never works properly on calculators |
| + | [* black] This amazing thing practically never works properly on calculators after half a century of neglect. |
| [* black] On the right side of the carriage, unscrew and remove the zeroing crank. | |
| [* red] 4-48 machine screw, 1/4" | |
| [* red] Zeroing crank |