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The phenomenon of Senko-Hanabi Japanese sparklers

It is important to study the phenomenon of the Senko-Hanabi in order to acquire knowledge about the phenomena of the fire dust and sparks, and further about the prevention of accidents. [Pg.68]

Senko-Hanabi is an old firework in Japan. In 1927 Dr.Nakaya first presented the results of his physical study on this item[Nakaya and Sekiguchi Riken Report, 6,p.1083(1927)]. In 1957 the author made an effort to clarify the mechanism of sparks from the chemical point of view [T. Shimizu Studies in fireworks on the Japanese Senko-Hanabi, Journal of the Industrial Explosive Society,Japan,18,p.359(1957)]. A.Maeda and his pupils at Shinjuku High School in Tokyo made experiments on the problem in detail[Shinjuku-Koko(High School), Studies on the old Japanese firework Senko-Hanabi (1962)]. Here is a summary of the important results in precis. [Pg.68]

The phenomenon of Senko-hanabi occurs after a black powder-type composition burns out at the cinder stage it coheres into a fire ball and emits many pine needle-like sparks from its surface as it reacts with oxygen in the air. In this case the remaining charcoal and potassium [Pg.68]

The pine needle-like sparks resemble the sparks of iron which are obtained by grinding iron. In the latter case, the melted substance is iron and the sparks are caused by the explosion of the carbon in the iron. Accordingly we can get some idea of the carbon content of the iron by observing the sparks [Kawai Metal materials,p.91 (1960)]. At 0.2% carbon content there are few sparks, but as the carbon increases more sparks are produced, and at 0.7-0.8% carbon content we get most sparks. The difference between Senko-Hanabi and iron sparks lies in the fact that in the former the carbon is not in a dissolved state, but in the latter it is dissolved. [Pg.69]

Using compositions which consist of carbon powder(paulownia charcoal, pine charcoal or pine soot), sulphur and potassium nitrate, we obtain the zones in which the pine-needle-like sparks occur(Fig.49).  [Pg.69]


The phenomenon of Senko-Hanabi(Japanese sparklers) 68 10.5 Various relationship with the phenomenon of... [Pg.338]


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