Selhurst Saint wrote:The win that should have been questioned is the Richmond win.
The siren started sounding while the ball was still in the air prior to McMahon marking it.
I didn't see Connolly jumping off the bench and running onto the field this time around. The comentators made a small mention of it at the time but then forgot about it. Seems like the rest of the football world has as well.
Sirens are a poor way to determine the end of a match.
Anyone who has watched the cricket at the MCG will have noticed that you see the batsman hit the ball and then after a short time hear the thwack.
That is because sound travels at about 343 m/sec in dry air at 20C.
It varies with temperatue and humidity but not much with pressure differences.
The time keepers box at the MCG is the first "box" next to the eastern end of level 3 of the MCC members stand.
They press two mushroom head switches simultaneously to sound the siren.
Electricity travels at over 100,000km a second in copper wires.
So effectively the siren sounds immediately the buttons are pushed.
The sirens are located under the roof of the top deck of the stands and their location is most important.
Even if you surrounded the boundary with sirens the middle of the ground would still be 70 metre further from the siren than the boundary.
That is 0.2 sec.
If the ball is kicked horizontally at 180km per hour it will travel 10 metres in 0.2 sec.
But with the sirens mounted in the stands the time from the siren to the controlling umpire can easily be as much as 170 metre. That's 0.5 second and a 25 metre kick.
The AFL rule is that the game ends when the controlling umpire hears the siren, not the crowd and not the TV, and he then signals the end.
Except if the game is against St Kilda in which case the AFL Commission can end the game at any time to the detriment of St Kilda.
Of more concern should be the response time of the time keepers. They often let the clock run on for 2 or 3 seconds after the umpire has signalled play on and again are slow to react when the umpire signals time off.
You can see this on the television coverage each time the umpire signals time on.
They are equally slow when the count down clock reaches zero despite both hands hovering over the mushroon head switches.
I have watched the time keepers in action at the MCG, they move their arms slower than geriatirics.
AFL football has many unpredictables like the bounce of the ball but time keeping is not usually recognised as the real variable that it is.
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