"alan_m" wrote in message
...
On 23/09/2017 22:06, Chris wrote:
On Sat, 23 Sep 2017 14:59:02 +0100, Steve wrote:

On Sat, 23 Sep 2017 11:34:47 +0000 (UTC)
Chris wrote:

Any other fencing systems worth considering?


https://www.katzecure.com/


Why aren't the rollers just stacked on top of each other on the top of
the fence?


Its the overhang that does the job. The cat has to jump from the vertical
backwards and outwards and then the roller will spin in a direction to
drop the cat downwards.

Its more to provide a wide enough rotating area at the top of the fence.

If it was just one roller, some cats could leap right over it.

If the rollers were stacked above each other the cat could bypass the
lower one

The lower one would in fact have no purpose at all.

and then be catapulted outwards on the top roller.

Those fences are primarily designed to keep your own cat in your own
garden and not necessarily to keep other cat out.

They prevent any cat from successfully landing on the top of the fence.

Its far from clear how long they continue to rotate well enough to stop a
cat tho.