Anyone know anything about the history of the tripcocks used on TfL
lines?
In 1893 J. R. Dix, manager of the Corris Railway, patented a device to
prevent a train passing a signal at danger, described thus: The wire
which places the signal at danger also elevates a lever between the
metals, which, coming into contact with the brake tap on the engine,
operates upon the steam or automatic brake and brings the train to a
standstill.

He sold the patent in 1901, about the same time tripcocks were
introduced in London. What I'd like to know is, were the tripcocks
based on Dix's patent or could the purchase have been a device to
prevent a claim for infringement?

In article ,
am (Peter Johnson) wrote:

Anyone know anything about the history of the tripcocks used on TfL
lines?
In 1893 J. R. Dix, manager of the Corris Railway, patented a device to
prevent a train passing a signal at danger, described thus: The wire
which places the signal at danger also elevates a lever between the
metals, which, coming into contact with the brake tap on the engine,
operates upon the steam or automatic brake and brings the train to a
standstill.

He sold the patent in 1901, about the same time tripcocks were
introduced in London. What I'd like to know is, were the tripcocks
based on Dix's patent or could the purchase have been a device to
prevent a claim for infringement?

Isn't this another bit of Underground practice imported from North America?

--
Colin Rosenstiel