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U.S. NAVY BASIC MECHANISMS OF FIRE CONTROL COMPUTERS MECHANICAL COMPUTER INSTRUCTIONAL FILM 27794

PeriscopeFilm · 225.4K views · 2018-05-10 · 19:43

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Overview

A 1953 US Navy training film on the basic mechanisms in fire control computers: shafts, gears, cams and differentials. It shows how these mechanical parts compute ship and target firing solutions.

On Hacker News

HN treats it as the classic demonstration of how analog mechanical computation works, especially the differential gear section.

Recommended by 11 HN people across 11 months · HN mentions 2018–2026

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What people said

ethbr1 · 2023-11 · Strong recommendation

Two gems (among many)... Periscope Films (on YouTube): [LINK] Digitized 40-60s era reels. It still amazes me how effectively they presented complex topics then. E.g. mechanical naval gunnery computers: [VIDEO] And this on-the-ground movie on the Columbia student occupation in 1968: [LINK]

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turtledragonfly · 2024-08 · Recommendation

I especially like the section on differential gears, demonstrating their use as computing units: (timestamped link) [VIDEO]

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maxglute · 2023-12 · Recommendation

From top of head I really enjoy: MAPMAKING PROCESS, THE [LINK] mechanism computer of fire control computer (a classic) [VIDEO] Physical science documentary series whose exact title I can't recall. It has been a while. To find more, my method is to do the occasional PeriscopeFilm binge (on youtube that digitizes a lot of old media, with great descriptions), always find find something interesting I haven't watched. If style, delivery really good, there's usually something in description to point to more. Like "U.S. NAVY TRAINING FILM", which usually returns playlists, and videos in same era often share quality. The technical ones generally don't disappoint. Another one is The Best Film Archives with good military training playlists. Tangent for others: the one I wish to remember, is a deleted/banned channel, one of the original US archival footage channel, with I think 1000s of videos, that got wiped many years ago right when youtube started drm crackdown. It had a companion website with obsessive amount of detail and tags to find the perfect video. And from what I recall, it didn't feel like a business like periscopefilm, but a passion project. It was an incredible amount of work to have been wiped out.

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Sources

Video by PeriscopeFilm, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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