Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 60
Fig. 37. uA -Boy Focusing Burning Glass onLeaves to Make Fire. THE SUN, BRIGHTEST OF ALL STARS 39 … Fig. 38.—Boy Sending Flash Signal with Mirror. and will prove very useful if you are able to send and receivemessages in the dot and dash alphabet, or Morse telegraph code,which is given in Fig. 39. A short flash represents a dot, a ij#F mm m ! i I i i ! U-4-. mm mm. fI ffHl • t.{ I I I I I…
Astronomy · Stars
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