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Digitized versions of trade catalogs. Browse by company name, type of instrument, or category--acoustics, astronomy, balances, biology, chemistry, drawing instruments, education, electricity, engineering, geophysics, math, medical apparatus, meteorology, microscopy, natural history, natural philosophy, navigation, optics, photography, physics, spectroscopy, surveying. Images may be freely downloaded for personal, research and study purposes only; see the Permissions link forfurther details. Provided by the Smithsonian Institution

Kay - saw your post and thought you'd be interested in the new set of scientific teaching collection videos we've (NMAH) posted on YouTube. We are in the middle creating a website for these videos, and we'll be adding more over the next year or so. http://www.youtube.com/user/SmithsonianAmHistory?ob=0&feature=results_main