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Plymouth's labyrinth of alleyways that lead to a secret garden An inconspicuous passageway opens out to reveal a hidden gem: courtyards, box hedges and even a fountain; all beautifully designed to recreate a 17th-century garden The Elizabethan Gardens on the Barbican (Image: John Allen) Get the latest nostalgia features and photo stories straight to your inboxInvalid EmailSomething went wrong, please try again later. Subscribe When you subscribe we will use the information you provide to send you these newsletters. Sometimes they’ll include recommendations for other related newsletters or s...

Posted by Ian B. on 18/12/2020 11:17:47: Agree SOD. Even PTFE will leach some particularly nasty stuff in the right circumstances. We had to change all the massive insulators in reactive ion etch machines to cross linked polyester (1" thick plate stuff) because of this. And I am very wary of using VITON 0 -rings for anything these days. They are extremely heat sensitive. they leach hydrofluric acid at fairly low temperatures and yeah I got burned. Problem is they were the only polymers that did not out gas at the pressures we were pumping down to. Add heat and BINGO. Ian, that is interesting ...

Never had a problem with soluble/suds oil and brushes as such. Slideway oil clogs them and swarf and non ferrous chippings stick in the bristles even worse then. A good scrape on the rim of the scap bin and a squeeze in an old towelling rag increases useful life. The best brushes I have found are the really cheap and nasty 1 1/2 inch paint brushes from the likes of pound shops. We used to have access when in business to a cheap tool warehouse. I bought these things in boxes of a dozen at a time. They each have twice the working life of any branded brush. The very best ones are unpainted hand...