[QUOTE]Originally posted by ChuckAuger
[B]Is to use 2 stop watches. The first on is clicked when the plane passes it, and left running. The second one is clicked when the plane passes it and left running. Then both watches are brought to one person who stops them both. Time of the second watch is subtracted from the time of the first watch. That is the time thru the trap.



I am trying to picture this but I need slides!