restriction against their sale as gum ha removed* 
The nee of explosive devices known as "duok bombs'* to frighten 
ducks from the rice fields without injuring them was strongly advocated 
end two firms in dan Francisco, the haeliff dales °o., 146 Davis at.. 
and the California Fireworks Co*, 249 Front 
patting these on the manat* On examination 1 lound these "duck bomba” 
to be what is ooomonly called a*daylight salute*** They are fired from 
small mortars, tubes made of heavy paper or galvanised iron two inches 
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in diameter and a foot long that are embedded in the earth for half their 
length, inolined in the direction toward which it was desired to throw 
... i, ■ 
the bomb* When in position the bomb was placed in the mortar and a long 
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fuse ignited with a match. This set off a firing charge in the base of 
the bomb that threw the bomb itself owt into the air where it wae exploded 
through a time fuse in the base* 1 purchased a considerable number of 
these bombs (about C&O.OO worth in all) and gwve them a thorough trial* 
In audition to using the standard bombs 1 had a number made up specially 
in order to experiment with them in various ways* These bombs retailed 
at from $3*60 to $6*00 per domen* 
In using these bombs tbs operator worked out along the levees as 
near to the feeding duoks as possible, set the mortar and then threw a 
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bomb out ovor the birds* It sms b*at to sot two or three mortars explode 
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one bomb to raise the birds, and light one or two others so that they 
* 
i *' * "w t • *’ *Aje 1 *,• ** -•»- * i/i’ * \ 
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would throw and explode among the flocks as they rose* The bombs con- 
tained the powder making the explosion, magnesium producing a flash. 
and antimony producing smoko* The amounts of all of tease could not be 
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increased without making the bombs too expensive for use* By experiment 
