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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 52 



same process and by scraping. By leaving different thicknesses 

 of the wood and by pasting or pegging with rubber different articles 

 inside the log, the sound is regulated, much on the same principle as 

 in the body of a violin. Usually four sounds or notes are produced 

 by hammering, one from each side of the vertical canal on each log, 

 the logs being suspended by rope-like vines from a tree or from a 

 frame built especially for the purpose, as seen in accompanying 

 sketch. The larger log, from which emanate the deeper tones, is called 



I'lG. 57. — The Manguarc, for sound signaling. 



the "male," and the smaller one the "female." The person who sig- 

 nals stands between the logs, holding in each hand a "beater" made 

 of a piece of wood covered at one end with a ball of crude rubber and 

 not unlike a large drum-stick. The strokes are usually given very 

 rapidly, producing deep, booming notes, which are heard for miles 

 around. Stories vary as to the distances to which the sound pene- 

 trates, but in my own experience I have known of a message being 

 received at a distance of approximately 15 miles. The contrivance. 



