Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 14
s and corners are some-what blurred and not sharp. Take a new piece of black paper, make a triangular hole one-quarter inch on a side, tack it over the slit and get an image of thesun at one inch from the hole, then at greater and greater dis-tances. Is the image at first triangular and does it…
Light · Scientific recreations
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![An illustration from [Duodekàs] emblematum sacrorum quorum consideratio accurata ad fidei exercitium et excitandam pietatem plurimum facere potest : erster [-vierter] Theill : schöner geistlichen Lehr vndt trost figuren, deren fleissige betrachtung zur Glaubens vbung vndt erweckung Chistlicher [sic] andacht, durch Gottes gnade, sehr deinlich sein kän (1625)](https://img.insideoutlibrary.com/img/200/ia-duodeksemblema00saub-78-146.webp)
