Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 181
es in apath which is more different from a circle than the pathof the earth, and consequently it is appropriate to intro-duce this subject when we are engaged about Mars.We must first take another lesson in drawing, and 168 STAR-LAND. the appliances I want you to use for the purpose arevery simple.… … Fig. 55. — Specimens of Ellipses. It does not much matter where we put them in. Nextwe take a piece of twine and tie the two ends togetherso as to form a loop, which we pass round the two tacks THE IMPORTANCE OF THE ELLIPSE. 169 (Fig. 54). In the loop I place the pencil, and then jonsee I move it…
Astronomy
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