The boy's own book of indoor games and recreations : a popular encyclopædia for boys (1890)
Stables, Gordon, 1840-1910, Hutchison, George Andrew, 1841-1913 · Philadelphia : J.B. Lippincott · leaf 385
llond, No. i, Ludgate Hill, whohave given me some valuable hintswith regard to the construction ofthis telescope. A refracting telescope consistsof an eye-piece, a tube, and anobject-glass; these are mounted ona firm stand. The object-glass atone end of the tube collects the rays of light,… … HOW TO MAKE AN ASTRONOMICAL TELESCOPE. 381 The stand must be firm, so as not to vibrate when any one passes along thefloor of the room, and it must have a vertical and lateral motion connected with itFig. I shows what our instrument will be like when finished. The first thing to be made is the…
Games · Amusements
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