On 14/05/2018 09:54, Brian Gaff wrote:
Well seeing as it was something I could have done at my school in the 1960s,
its probably been health and safetied to destruction by now, Naked flames
using your lungs to expand molten glass, I mean, .....

All I remember was keep on rotating the glass tube and only just heat it
enough to make it plastic. Tip, do not breath in!

I visited a glass works when I was at school. I remember being told that
originally the glass blowing staff had been given free beer by the
company. The company had been able to persuade the staff to stop this
practice, probably because it was not particularly good for the staff.

--
Michael Chare