How Differential Gear works (BEST Tutorial)
Why Hacker News recommends it
HN loves it as an example of old-school instructional film that makes how a differential works fully understandable in clear, simple language.
What it is
A 1930s Chevrolet training film explaining the principles and development of the differential gear. It builds the idea step by step from first principles to the finished mechanism.
Recommended by 5 HN commenters across 5 different months, 2013 to 2020.
What Hacker News said
Strong rec Sukotto · 2013-07 · on “Show HN: Sketch, connect and simulate gears and chains”
In case you're interested, here are two of the best video's I've seen describing how a watch works ( [LINK] ) and how a differential works ( [this video] ) Don't let their old school-ness throw you off. They are both extremely well done and demonstrate in clear and simple language from first principles to finished object.
Strong rec nogridbag · 2015-07 · on “How a car works (2012)”
Neat site. My father was a mechanic and thus I should know all of this stuff, but I wasted away my life behind the keyboard instead :D I often find videos do a much better job at explaining some concepts. For example, the section on differentials: [LINK] After reading this I feel none the wiser. Whereas after watching this ancient Chevrolet training video from the 1930's I feel like I completely understand how diffs work: [this video]
Strong rec anitil · 2020-04 · on “How to Use a Differential Analyzer”
These old-school education videos are such a treat. One of my favorite is on differential gearing - [this video] (apologies about the clickbait title)
Recommends rileyjshaw · 2014-11 · on “Space Filling Curves (1972) [video]”
Fantastic!! High-quality educational videos like this are hard to come by. Here's another retro tutorial that really stands out in my memory (differential gears): [this video]
Recommends tzs · 2015-08 · on “How a Watch Works (1949) [video]”
I've never understood why these old instructional films so often seem much better at getting things across and making them stick in my mind than more modern material. A couple other examples. 1. A 1959 film from Bell Labs on wave behavior that made standing wave, reflections, energy loss due to impedance mismatch, and impedance matching much clearer than anything else I've seen: [1]. 2. A 1937 explanation of how the differential in a car works: [2]. Here is another upload of that which is lower resolution, but has more from the same source in the sidebar [3]. I suppose it could be something akin to survivorship bias that makes old educational films seem so good--the bad ones don't get rememb