Sherlock Holmes: Never theorize before you have data. Invariably, you end up twisting facts to suit theories, instead of theories to suit facts.
In the scene where Holmes is defending himself with some sort of electrical prod, it's clear that the tips of the prod have the same electrical potential (they are connected to the same metal). Subsequently, this device could never be used to shock anyone unless they were standing on a metal plate that was connected to the opposite electrical pole of the prod tips. If it had a Leiden-Jar type power source, it would have been expended after the first jolt. See more...
Watson points out that one of the vials of liquid in Holmes' possession is "used for eye surgery". In the late 18th century, cocaine was used as a form of medicinal treatment for multiple eye injuries and diseases. In the novels, Holmes is in fact, a cocaine addict. See more...
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