Wiring layout for computing using an IBM Tabulator – here to create a statistical report “classifying employees by sex and age group”.
Antennas used for measuring electromagnetic fields, via ETS Lindgren.
Apple’s “Mission Control” can be activated by swiping three fingers upward to shrink the current windows, allowing easier viewing of what you have open. But what if it wasn’t shrinking, but moving backwards in three-dimensional space? Sort of like this:
Linear perspective, following Euclidean geometry, lets us calculate the distance of an object based on its actual and apparent heights. With a few screenshots we can get the measurements.
A full-sized window on my laptop measures:
1746 pixels high @ 144 ppi (12.125 inches)
In Mission Control view, it measures:
1034 pixels high @ 144 ppi (7.181 inches)
Now, using this formula:
d = h*a
h = apparent height
a = actual height of object
d = distance
And given our measurements, we can calculate the Mission Control depth:
d = 7.181 * 12.125 = ~87" = ~7'3" (or about 2.2 meters)
Or about like this:
Photocopy of a screenshot of CAD software, via this patent: “Method and apparatus for geometric variations to integrate parametric computer aided design with tolerance analyses and optimization”.
A chart for measuring the diametrical pitch of a gear.
Hasbro’s 1960 game Think-A-Tron, which you can buy here.