The reason for use scale IDs instead of "common" name is that there is no consistency between manufactureres in labelling and naming scales. Also, same name (label) may be given to two slightly different scales, and sometimes to two completely different scales. For example, sine scale, usually called S has variations in what units (degrees and minutes, defgrees and decimal fractions of a degree) it is graduated. On the other hand, square root scales are called sometimes "R", sometimes "W" and sometimes "√". "P" may denote a "pythagorean" scale with formula $\log\sqrt{1-u^2}$ on Aristo rules or it may denote top variant of "vector" scale with formula $u^2$ from Hemmi 153.

When in the layout description, scale ID may be appended with a suffix that defines scale direction. "_" denotes "standing" scale, with tickmarks below the labels. Example of such scale is "C" scale. "~" denotes "hanging" scale, which tickmarks above the labels. Example: "D" scale. If suffix is not specified, \yasre{} will try to pick one style or another, depending on situation. If you do not like the choice, specify suffix explicitly.

Graduation of scales in this emulator is chosen to represent mathematical relationship to other scales and to be legible at low screen resolution. It is not chosen to accuratley portray individual scale of any specific slide rule. Variants of essentially the same scale on different rules may have different graduations, label placements and special tick marks.

- -
- horizontal rule one pixel wide;
- notch
- left and right notches
- lnotch
- left notch
- rnotch
- right notch

- analon1
- dimensional analysis scale from K&E Ananlon
- analon1i
- dimensional analysis scale from K&E Ananlon, inverted
- analon2
- dimensional analysis scale from K&E Ananlon
- analon2i
- dimensional analysis scale from K&E Ananlon, inverted

- l
- decimal logs (linear)

- cm
- centimeters
- in
- inches, decimal subdivisions
- inbin
- inches, binary subdivisions

- cel1
- degrees Celsius, linear
- far1
- Fahrenheit, linear

- cel2
- degrees Celsius, logarithmic
- far2
- Fahrenheit, logarithmic
- chem1
- chem2
- atomic weights of certain elements and common compounds
- circ
- pythgorean
- deg
- angular degree
- gtheta
- gudermanian scale from Hemmi 153 system
- ISTd
- Thornton differential trig scales (all 4)
- kel2
- Kelvin, logarithmic
- ln
- natural logs (linear)

- ldk
- logs, decimal keeper
- log1dk
- logarithmic, decimal keeper
- log1dki
- logarithmic inverted
- log2dk
- logarithmic half size decimal keeper
- log2dki
- logarithmic half size decimal keeper, inverted
- log3dk
- logarithmic, one third size, decimal keeper
- log3dki
- logarithmic, one third size, decimal keeper, inverted

- log1
- This is the most ubiquitous scale. Pretty much every slide rule has it. It is often present at least twice -- once on a slide, once on body. Duplex rules usually have for copies of this scale -- 2 on one side, 2 on another. The pair of log scales allow multiplication and division. The scales are most commonly labeled "C" for slide-bound and "D" for body-bound. Most books use this notation when refer to these scales. Other scales, providing means to calculate special functions, often refer their values to this scale.
- log2
- logarithmic, half size, 2 decades. These are known as "A" and "B" scales. When referred to "C" and "D" scales they allow calculation of squares and square roots. The multiplicationa and division may also be performed on "A"/"B" pair, rather than "C"/"D" pair. Interesting enough, early Mannheim rules (with A[B,B]D layout) intened to use these scales as main calculation scales. Extra copy of B aligned wit single-decade scale "D" on body allowed squares and square roots without cursor line.
- log3
- 3 decades logarithmic, one third size. Known as "K" scale, used to calculate cubes and cube roots. This site also describes fifth degree root algorithm where "K" plays prominent role.
- log4
- logarithmic, one quarter size

Alias | substitution |
---|---|

A | "A"log2 |

B | "B"log2 |

C | "C"log1 |

D | "D"log1 |

K | "K"log3 |

L | "L"l |

CI | "CI"log1i |

DI | "DI"log1i |

CF | "CF"log1fPI |

DF | "DF"log1fPI |

CIF | "CIF"log1ifPI |

DIF | "DIF"log1ifPI |

AI | "AI"log2i |

BI | "BI"log2i |

ST | "S&T"sin0min |

S | "S"sin1min |

T | "T"tan1min |

T2 | "T2"tan2min |

SI | "SI"sin1mini |

TI | "TI"tan1mini |

L | "L"l |

LL0 | "LL0"logln0 |

LL1 | "LL1"logln1 |

LL2 | "LL2"logln2 |

LL3 | "LL3"logln3 |

LL00 | "LL00"logln00 |

LL01 | "LL01"logln01 |

LL02 | "LL02"logln02 |

LL03 | "LL03"logln03 |

N | ""notch |

LeftN | ""lnotch |

RightN | ""rnotch |

P | "P"circ |