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 370
ring nebuke, of which I have just spoken, A PRETTY EXPERIMENT. 357 and the form of which I can simulate by a prettyexperiment. We take a large box with a round hole cut in oneface, and a canvas back at the opposite side. I first fillthis box with smoke, and there are different ways ofdoing so.… … Fig. 88. — How to make the Smoke-rings. make people cough, and, besides, phosphorus is a dan-gerous thing to handle incautiously, and I do not wantto suggest anything which might be productive of dis-aster if the experiment was repeated at home. A littlewisp of hay, slightly damped and lighted,…
Astronomy
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