I wish to make a large Newton's Cradle. That usually consists of five
suspended steel balls. Ideally the balls will be at least 2" in
diameter or up to 12" or 24" in diameter.
If they were steel they are likely to injure childen. So they can't be
steel. Billiard balls bounce well but are still too heavy.
Golf balls don't seem to bounce properly so they are no good, and are
too small. Soccer balls don't bounce that well either.
Polystyrene foam is too flimsy.
Any brilliant ideas? I have an idea which I will experiment with.
On Tue, 01 Jun 2010 13:18:28 +0100, Tim Watts wrote:
You just need some big pressure-sensitive switch on the ground,
activating some mechanism to stop things dead if the switch is tripped.
Unless the little buggers decide to meddle from above, I suppose... :-)
The two I saw had no mechanical sense whatsoever. Situations that have
existed for 40 years or more and which have never caused any accidents
or problems, they saw as needing urgent attention.
e.g. someone climbing a ladder without a safety harness and helmet.
There are plenty of men like that too. Gender is not a reliable
indicator of whether someone possesses any particular type of sense.
But I suppose someone being from NZ is a slightly more reliable
indicator of gratuitous misogyny. ;-)
I worked somewhere where the male H&S idiot used to lock off the tearoom
if the tealady (how quaint) wasn't in, "in case someone burn themselves
on the urn". FFS... Electronic Engineering department too.
Bit different to the Mech Eng department I worked in the in late 80's.
Got stuck in the lift as the doors had come unaligned with each other.
Anyway, one of the lecturers (big beard, pipe, tweed jacket, proper
mechanical bloke) let me out with the door key. Then rammed his arm
between the doors, jiggled the mechanism back into line and wandered
off... I took the stairs after that... Oh, and we had a bloody big urn
balanced on the fridge right by the door in that tearoom...
Eek. I would have used the stairs too.
Back in the 70s, I recall using a lift that had no doors and was in
constant motion. Cannot recall where it was but it was somewhere in
the UK. Scary. After one try, I took the stairs.
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