Did they somehow find a way to make a long tap (e.g. slide something against the... | Hacker News

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		kqr 7 days ago \| parent \| context \| favorite \| on: Telegraph chess: A 19th century tech marvel Did they somehow find a way to make a long tap (e.g. slide something against the radiator for a continuous signal) or did they agree on two different kinds of short taps? (Or do the pipes resonate for long but can be dampened by hand to produce a short tap?)

cwillu 7 days ago | [–]

I believe the usual thing is to essentially encode it by the spaces between the taps, rather than the taps themselves.

kqr 7 days ago | | [–]

But then how does one distinguish between letters? Something like "ETA" would be difficult to tell apart from "II".

qingcharles 7 days ago | [–]

I used this:

https://en.wikipedia.org/wiki/Tap_code

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