owder of wool and a spiral envelope of thin gilded paper. perforated rim, which fits the circular easing and acts as is sprinkled on the surface several times a day for some The strip of paper is only two-fiftieths to three-fiftieths a valve in controlling the escape of air. The perfora- days to… … are due in New at the center of Fig. 4.-CENTRIFUGAL SIREN, Fig. 3.-DETAILS OF THE SIREN. Jersey this sum- the casing is mer, and Professor John B. Smith, the entomologist gold thread, these threads possess the advantage of thrown outward by centrifugal force, thus maintaining of the State…
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