this post was submitted on 18 May 2026
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thnx random textbook from 1975 such great information /j

jokes aside the book is super interesting and (mostly) awesome. the name is Engineering Graphics (Giesecke et. al, 1975) and it has SO much cool stuff about hand drafting (pretty much drawing engineering diagrams by hand) and 3d sketching and so forth. picked it up from a local booksale for exactly fifty cents. of course its age does show sometimes hehe

''huh? i don't get this...''

carbon tetrachloride was a chemical once commonly used for many applications, but that has since been discovered to be detrimental to the health (and ozone layer), not unlike asbestos. this is basically saying, if you want to erase marks on your tracing cloth—itself something quite antiquated—you simply need to rub it with a highly carcinogenic chemical.

as for "benzine" (do not confuse with benzene!), it is basically a hydrocarbon soup, many of the components of which may also be toxic!!! examples include toluene and benzene. as you may guess it is also very flammable x3

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[–] finalarbiter@lemmy.dbzer0.com 5 points 1 week ago* (last edited 1 week ago) (1 children)

That's awesome! It's super cool you have access to some living history like that, I'm more than a little jealous. I definitely agree, there's a real sense of accomplishment to putting together a drawing by hand, it's an art unto itself that is rarely appreciated these days IMO.

It's great that you're also using those drawings to actually fabricate stuff- that's probably the fastest and most effective way to determine whether you're communicating sufficient and appropriate information. If you missed a dimension or callout, you might not notice unless the machinist feels charitable and asks you (many places will make assumptions and keep moving, rather than hold up production) or the end product isn't functional in a way it needs to be (e.g. parts don't fit together, a thread is missing, etc.). It also better informs your design, as you understand how to make the thing you're designing and know when you've drawn something impossible to make. I think some of the more research-focused schools miss this, as they spend so much time on theory without any practical experience to back it up, and thereby produce engineers who are entirely disconnected from the processes they oversee or contribute to.

[–] erev@lemmy.world 3 points 6 days ago (1 children)

an engineer who has never built a car will do things that makes a mechanic curse.

a mechanic without adequate engineering knowledge (doesn't have to be formal) will do things that make an engineer sweat.

[–] finalarbiter@lemmy.dbzer0.com 3 points 6 days ago

Absolutely, drives me nuts when I see shit like bolts without wrench clearance.