Richardson’s 1898 Slide Rule

drag click
?
+

 cursor opacity:
0.60

 first digit opacity:
1

 second digit opacity:
1

 zigzag scale opacity:
1

 pyramids opacity:
1

 traditional scale opacity:
0

description: José Fernandez
animation: Andries de Man
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0 1 10 11 12 13 14 15 16 17 18 19 2 3 4 5 6 7 8 9 1 2 2 3 3 4 5 5 6 6 7 8 9
×
Manual
This simulation partially mimics Richardson’s 1898 Slide Rule.
You can:
Make parts (semi) transparent, using the sliders, for instance to see if the parts are essential,
or to compare the zigzag scale with a traditional logarithmic scale
save current settings as a URL
run a magnifier over the slide rule
The simulation can run in two modes:
drag:  move the slide and cursor
click: the value at the position of a mouse click is shown in the digital display
Read the description given by José Fernandez in the Proceedings of the IM2019 to fully understand this calculating device.