Mechanical Relays

On Saturday, 2 November 2019 08:04:41 UTC, Rick C wrote:

On Saturday, November 2, 2019 at 3:18:05 AM UTC-4, jrwal...@gmail.com wrote:
On Saturday, 2 November 2019 00:18:35 UTC, Piotr Wyderski wrote:
Rick C wrote:

Not sure what word Piotr intended, but I'm pretty sure it wasn't "isotope".

I was just kidding to indicate that whether mercury is poisonous or
healthy depends on the amount of cubic dollars being at the disposal of
a particular lobby...
Another example is of course lead. Its not allowed in solder, but
car batteries are permitted to use huge quantities. Similarly, large
amounts of lead can be used in roofing a building, but lead in paint is
forbidden.
John

Do you seriously not understand the differences?

Very clearly. There are lots of inconsistencies in the application
of environmental rules. In the automotive case, solder in the
electronics must be lead-free, even though the total quantity of lead
used in this way in each car is very small and the electronics is likely
to be recycled when the car is scrapped. Lead-acid batteries are
permitted, no doubt because there is a well established recycling
system. However, as owners often replace car batteries, not all find
their way into the recycling system. Many get dumped.

Lead used for roofing and flashing slowly gets into the environment
due to corrosion and being nibbled by squirrels, but it is permitted.
Lead paint was originally banned in domestic situations because of
the risk of children chewing painted woodwork, so maybe that was not
the best example to pick.
John