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Pencil bomb
A pencil bomb was a type of time bomb with a timer that could be set to detonate any given time. It was designed by German chemist, Dr. Scheele and used by German spy Franz von Rintelen during World War I.
==Design==
When the bomb prototype was first shown to Rintelen by Scheele it was a hollow cylinder of lead the size of a large cigar. Into the middle of the tube a circular disc of copper had been pressed and soldered, dividing it into two chambers. One of these chambers was filled with picric acid, the other with sulphuric acid or some other inflammable liquid. A strong plug made of wax with a simple lead cap made both ends airtight. The copper disc could be as thick or as thin as desired. If it were thick, the two acids on either side took a long time to eat their way through. If it were thin, the mingling of the two acids would occur within a few days. By regulating the thickness of the disc it was possible to determine the time when the acids should come together. This formed a safe and efficient time-fuse. When the two acids mingled at the appointed time, a silent but intense flame, from twenty to thirty centimetres long, shot out from both ends of the tube, and while it was still burning the lead casing melted away, leaving very little evidence of the source of the fire.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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