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be varied with good success.  Thus for daylight use bombs containing more antimony and less magnesium produced a loud report and a ball of smoke that expanded rapidly, while for night work the antimony was largely eliminated to be replaced by magnesium which produced a bright, startling flash.  It was found too that a mortar 18 inches long made of heavy galvanized iron pipe with an opening two inches in diameter gave better results than the smaller lighter tubes, supplied by the bomb manufacturers as it threw the bombs much farther [[strikethrough]].[[/strikethrough]] before they exploded.  In addition it was considered safer to use as occasionally both the firing charge and the bomb exploded in the mortar usually driving it deep in the mud, with the heavy mortars it was possible also to throw the bombs with much more accuracy.

So long as the ducks were being shot at with shotguns the bombs were a success and were an efficient aid in driving out the birds. With the duck bombs it was possible to raise the ducks from large areas of rice. Often I had flocks leave when bombs were exploded at a distance of an eighth of a mile. I soon found however in areas where there was no shooting that the ducks soon became more or less accustomed to the bombs and would not rise unless the projectiles were exploded very near at hand. One night when lightning flashes came at intervals from storms near the horizon I found that the pintails paid little or no attention to bombs unless they fell almost among them.

In spite of the claims that had been made for them it was proved that they were not successful in keeping ducks out of the rice fields where there was no shooting. As an adjunct to herding with shotguns they were of great aid as when ducks were being shot at they were much frightened