In a message dated 98-07-31 18:56:03 EDT, you write: << That is a neat idea, Malcolm and Mark! If either of you turn up the reference for that article(s), please post it if you can. I for one, would like to pass it on to "Hally's WGN Reprint Services" for a copy. ;> >> If you have the old IMO handbook for visual meteor observations...check out page 89 where it talks about the Double Count Method. George Zay