![Bulletin - United States National Museum. Science. Figure 16.—Polishing lenses in the Alvan Clark & Sons factory. From cover of Scientific Ameri- can, 24 September 1887. Henry Draper, although an outstanding Bulletin - United States National Museum. Science. Figure 16.—Polishing lenses in the Alvan Clark & Sons factory. From cover of Scientific Ameri- can, 24 September 1887. Henry Draper, although an outstanding](https://c8.alamy.com/comp/RG7BK6/bulletin-united-states-national-museum-science-figure-16polishing-lenses-in-the-alvan-clark-amp-sons-factory-from-cover-of-scientific-ameri-can-24-september-1887-henry-draper-although-an-outstanding-instrument-maker-him-self-purchased-several-pieces-of-apparatus-from-the-clarks-a-clark-sider-ostat-on-the-roof-and-secondary-mirror-directed-sunlight-to-all-corners-of-his-new-york-city-laboratory75-this-laboratory-was-used-primarily-for-photographing-and-studying-the-spectra-of-the-elements-around-1879-to-verify-the-existence-of-oxygen-emission-lines-in-the-solar-spec-tru-RG7BK6.jpg)
Bulletin - United States National Museum. Science. Figure 16.—Polishing lenses in the Alvan Clark & Sons factory. From cover of Scientific Ameri- can, 24 September 1887. Henry Draper, although an outstanding
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PDF] Stimulating Intrinsic Motivation for Science learning by using digital tools during scientific multi – maker event | Semantic Scholar
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