Draw three parallel equidistant lines which will be the ordinates for the logarithmic graduations. These shall be graduated logarithmically such that lg 10 is represented by 250 mm; the three scales increase towards the top of the page. The points (20) and (10) should be placed approximately in the centre of the page on the lateral scales. Join the two points (10) of the lateral scales.
The intersection of this line and the central scale gives the point 56,5 of the left hand centre graduation .
The area scale is on the right hand side of the central line. This same point 56,5 is the point 100 on the scale of areas; the graduation should be drawn to a scale which is half the preceding one, namely:
lg 10 = 125 mm.
Width
Original gauge lengtn
Original cross-sectional area
Thickness
b mm
Figure description:
Nomogram Representation
Nomogram with Three Main Vertical Scales
Annotations
- Example alignment line (dashed_line - position: Starts at ~21 on Scale 1, passes through 100 on Scale 2 (approx. 310 on Scale 3, and ends at ~15.5 on Scale 4))
| Scale 1 (Left) | Scale 2 (Middle Left) | Scale 3 (Middle Right) | Scale 4 (Right) |
|---|---|---|---|
| 6 | 25 | 20 | 4 |
| 7 | 30 | 30 | 5 |
| 8 | 40 | 40 | 6 |
| 9 | 50 | 50 | 7 |
| 10 | 60 | 60 | 8 |
| 15 | 80 | 70 | 9 |
| 20 | 100 | 80 | 10 |
| 30 | 150 | 90 | 15 |
| 40 | 200 | 100 | 20 |
| 50 | 250 | 200 | 30 |
| 60 | 300 | ||
| 400 | |||
| 500 | |||
| 1000 | |||
| 2000 |
Notes: The image displays a nomogram, a graphical calculating device. It consists of three vertical lines with logarithmic or other non-linear scales. The middle vertical line has two distinct scales marked on its left and right sides. A dashed reference line demonstrates how values on the outer scales correspond to values on the inner scale(s.)
a mm