The roles of any official in the throwing events in track and field are to make sure the athlete does not throw out of the throwing sector, make sure he/she doesn't step out of the runway or ring, and make sure that he/she steps out of the ring or runway correctly (runway must be entered and exited through the side, and throwing ring must be entered and exited through the back half of the ring).
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the time keeper
As with officials in any game their purpose it to make sure the rules of the game are understood and followed by the players.
The senators were not officials. The were member of the senate and did not have an executive role. The plebeian were not officials either. They were the representatives of the plebeians and did not have executive functions. The censors were officials. The senators, the plebeian tribunes and Roman officials did keep their original role. Their roles never changed. The question was that some divisive issues in Rome were intractable.
Judges' roles are different from elected officials because judges are meant to uphold the law.
The starter (guy with the gun) The timers (people with the stop watches)
A Javelin
It is the Javelin.
The person who uses a javelin or participates in the sport is called a javelin thrower. The javelin throwers throw the javelin by the use of their hands.
Since javelin is a competitive event you would need at least two players but the more you had the better the competition would be. At the 2008 Summer Olympics in Beijing, there were 38 athletes in the men's javelin event and 54 athletes in the women's javelin event.
2.5m modern javelin