Ellison Patent specification 2017-07-10

[GMES]

GMES submitted a new resource:

Ellison Patent specification - Patent

This is the Patent specification from 1925 for George Ellison and Thomas brown for Improvements relating to trip or release mechanisms for electric circuit breakers and like apparatus.

I purchased this online for myself but would like to share it with any members who are as interested in this type of thing as me.

Read more about this resource...

 

[static zap]

(Since attempting to dismantle one 30 years ago , no internet ,no Xray.
but a nice pair of safety glasses .. expecting the worst)
And in consequence the mechanism ..moves more freely ?
... explains a few more of the bits that flew out !
Many thanks

 

[Marvo]

Bet you didn't know that earth leakage devices were invented in South Africa.
Patent US3737726 - Earth leakage detector for operating circuit interrupting means - https://www.google.com/patents/US3737726

 

[static zap]

Cheers

Bet you didn't know that earth leakage devices were invented in South Africa.

The other engineering solution to expensive earth wire , something to make TT safer. !