The patent history of automatic punches indicates two principal goals for the development of the tool : repeatability of impact, and convenience of operation.
2.
Also at this station, there is a sign next to the tower saying " What you punch is what you get "; this sign is referring to the automatic punch boxes on both tracks on the northbound platform.
3.
In 1905, Seitz patented a manually triggered punch that has many of the internal structural elements of some later fully automatic models, and Spalding was granted a patent in 1908 on an application filed in 1904 for a different design of leaf spring controlled fully automatic punch that included easy adjustment of blow as well as interchangeable, threaded on points.
4.
Then the notice contained these further words : " The public are respectfully requested to obtain tickets properly issued from the automatic punch in their presence from the Chair Attendants . " The very language of that " respectful request " shows clearly, to my mind, that for the convenience of the local authority the public were asked to obtain from the chair attendants tickets, which were mere vouchers or receipts showing how long a person hiring a chair is entitled to use that chair.
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