The boy's own book; a complete encylopedia of all the diversion, athletic, scientific and recreative, of boyhood and youth. (1834)
Clarke, William, 1800-1838, McManus-Young Collection (Library of Congress) · Boston, Munroe and Francis; New York, C. S. Francis, 1834. · leaf 119
OPTICAL AMUSEMENTS, 115 centre, at the circumference of the circle, d, in the annexed figure, which is a view of the right end of the instrument, from which the cap has been removed. ‘The circle is the edge of the tube, the lines, a ¢ and 6 c¢, are the edges of the two reflecting surfaces, which… … placed differently, or even parallel, as in the figure following. At the other end of the tube, (the object end,) where the two reflecting surfaces, a c 5 c, terminate, a circular piece of ground glass is to be fitte? “nto the tube, and retained there by means of a piece of wire, which is to be…
Amusements · Sports
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-162-0.webp)
