On Thu, 20 Nov 2008 20:52:10 +0900, "DiggerOp"
wrote:


"Rob H." wrote in message
...
We need help from a Civil War expert for the first piece in this
week's set:

http://55tools.blogspot.com/


Rob

1465 Could it be a device for indicating wind direction by compass
point?
Perhaps used in gunnery?


It could also indicate velocity. The arrow head is horizontal and the
nut could be run in or out to balance the arm against the wind.