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Some simple tools
This book makes heavy use of abacus procedure tables like:
| Abacus | Comment |
|---|---|
| ABCDEFGHIJKLM | |
| 4567890123 | Entering radicand starting in CD (first group) |
| 2 | First root digit in B |
| -4 | Subtract square of B from first group |
| 2 567890123 | Null remainder |
| 4 567890123 | Doubling B. Appending next group to remainder |
| 41 567890123 | 5/4≈1, try 1 as next root digit |
| -4 | Continue division by 41, subtract 1✕41 from EF |
| -1 | |
| 41 157890123 | 15 as remainder |
| 42 157890123 | Double second root digit |
| 42 157890123 | Append next group |
| 423157890123 | 157/42≈3, try 3 as next root digit |
| -12 | Continue division by 423, subtract 3✕423 from E-H |
| -06 | |
| -09 | |
| 423 30990123 | 309 as remainder |
| 426 30990123 | Double third root digit |
| 426 30990123 | Append next group |
| etc. |
and could also be enhanced by using some abacus diagrams here and there like this one:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
(Image: Jccsvq, CC BY-SA 4.0) |
| | 9 | 18 | 9 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 9 | 9 | 9 | |
If you plan to contribute to this book, you may find some simple tools located at User:Jccsvq/Abacus diagrams and procedure tables that may make some of these tasks easier for you. (Jccsvq (discuss • contribs) 05:46, 22 August 2021 (UTC))
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