Analysis of information sources in references of the Wikipedia article "华尔街爆炸事件" in Chinese language version.
The 1917 bomb used black powder with a homemade sulfuric acid/metal plate "time" fuse, which failed to explode until the package was opened at the police station. By 1920, it is notable that Galleanist bombmaker(s) had apparently discontinued the use of the unreliable acid detonators in favor of dynamite with an electric blasting cap and a clock wired to a battery as a timed detonator.
