Optics and Photography
Theory (only one small part done so far) in a Historical Suvey and Practical Demonstrations, [Photographic Bellows], [Microscopy and Photomicrography], [the (Pentax®) K-Mount], Optical Bricolage (i.e., camera and microscope hacking), [Making Lenses], and a [Miscellany]. In short, anything but the art of photography itself.
Safety
[MSDSs] [Glove and Chemical (In)Compatibility] See also Solvents.
Solvents
[Hydrocarbons: Basic Chemistry. Kerosene. Mineral Spirits.] [Ketones: Acetone] [For each: Glove and Chemical (In)Compatibility]
Lubricants and Coolants
Are these "Preliminaries" (because so many things need lubrication and cooling) or "basic Materials" (because they are materials, and basic)? I've got them classified nominally in the " Basic Materials" section, so this is a link there.
Research Tools
Notes on Researching and Downloading Old Patents. Image and Text Manipulation (extracting images from PDFs). Copyright Research References.
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