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
carbon tet will destroy your liver, and it’s also a dogshit solvent. hexane is a replacement in some applications. if you need a better solvent, use toluene
You know it’s bad when toluene is the safer, healthier alternative