Gauge Marks

Some iSlideRule scales have gauge marks, shown with small tick lines and labels. The table below show the marks, their symbols on scales, and which scales in iSlideRule have these gauge marks.

Gauge Mark
Name
Value
Scales that Contain this mark
π
pi
3.1415
A, B, AI, BI, C, CF, CF/m, CI, CIF, D, DF, DF/m, DI, DIF, F(2π), KZ, LL3, M3, M3', Q2, Q2', R1, R1', T2
τ
tau
6.28319
A, AI, B, BI, C, CF, CF/m, CI, CIF, D, DF, DF/m, DI, DIF, F(2π), KZ, LL3, M4, M4', Q3, Q3', R2, R2', T2
M
100/pi
31.83
A, B
π/4
0.785398
A, B
C
√(4/pi)
1.1284
C, D
C'
√(40/pi)
3.5682
C, D

dozen
1.2
C, CI, D, DI, KZ, T2

gross
1.44
C, CI, D, DI, KZ, T2
ρ pi/180 0.01745
C, D
ρ'
(18*60)/pi 343.7747
C, D
ρ"
(180*60*0.6)/pi 2062.648
C, D
ρ⁰
180/pi 57.29578
C, D
δ (200*100*100)/pi 636619.77
C, D
F
1/(2pi)
0.15915
C
√10

3.1623 C1, C2, D1, D2, R1, R2, R1', R2'
ʟ

2.3026
B
√2

1.414
H1, H2
⚡︎

3.29
CF, DF
1/2π 1/(2pi)
0.15915
D
s
4/pi 1.273
C
V
pi/6*10
5.236
C
e
Euler
2.718
N3
π/2
pi/2

X
¹/e inverse Euler

LL//2, LL/3

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