tion 4 parts potassium nitrate, 1 of charcoal, and 1 of sulfur has been reported in Chinese firecrackers; more recently mixtures containing both potassium nitrate and a small amount of potassium chlorate have been used; and at present, when the importation of firecrackers over 1% inches in length is practically51 prohibited. flash powders containing aluminum and potassium
81 Firecrackers not exceeding 1% inches in length and 5/16 inch in diameter carry a duty of 8 cents i»cr j>ound. For longer crackers the duty is 25 cents per pound, which practically prohibits their importation.
The Chinese firecracker industry formerly centered in Canton but, since the Japanese occupation, has moved elsewhere, largely to French Indo-China and Macao in Portuguese territory. Its processes require great skill and manual dexterity, and have long been a secret and a mystery to Europeans. So far as we know, they had not been described in English print until Wein-gart's book published an account of the manufacture oi clay-plugged crackers based upon informatiog received from the manager of a fireworks company at Hong Kong. His account is illustrated with three pen sketches, two of them of workmen
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