Summary

Frank Keiper 1911 Encyclopædia Britannica, Volume 28… (1911)

Others, however, maintaining that secrecy was the essential idea of voting by ballot, and that the form of the ballot was immaterial, worked on the idea of using a key and a counter for each candidate, the counter registering the successive impulses given to it by the key, the machine preventing the voter from giving the key more than one impulse, and preventing the voter from operating more keys than he is entitled to vote. The highest courts of four different American states have ruled that any form of voting machine that secured secrecy would be constitutional.
Source: Wikisource

Frank Keiper 1911 Encyclopædia Britannica, Volume 28… (1911)

Each state that adopts voting machines first enacts a law specifying the requirements that must be met in the construction of the machines. These requirements are substantially the same in all the states, the laws being copied largely from the New York Voting Machine Law. The laws require in general that the machine shall give the voter all the facilities for expressing his choice which the Australian ballot gives him, and further require that the machine shall prevent those mistakes or frauds, which if made on an Australian ballot would invalidate it.
Source: Wikisource

Frank Keiper 1911 Encyclopædia Britannica, Volume 28… (1911)

Wigmore in his book on the Australian ballot system points out thirteen ways of wrongly placing the mark, and forty-four errors in the style of the mark, besides many other errors tending to invalidate the ballot, all of them having frequently occurred in actual practice. These errors are not confined to the illiterates, but are just as common among the best-educated people. The ballots can and have frequently been altered or miscounted by unscrupulous election officers, and the detection of the fraud is frequently difficult and always expensive.
Source: Wikisource

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