Attached is a MP4 video (5.9MB) of Fan and Mortar geysers in October 1950. The quality is poor because the original was 8mm film, videotaped while being projected onto a screen. the film was done by David deLong Condon, who at the time was Yellowtone's chief park naturalist and this, apparently, was on the day when an attempt to induce an eruption in Morning glory was made. Please note two things: 1) at the start, Fan appear quite strong (this in answer to a query posted a few weeks ago), and it is joined by mortar after a few seconds; but then 2) watch the solo Mortar. Scott Bryan p.s. Twice I tried to post this video to Facebook, but it never showed up there. -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20160420/ff873700/attachment-0001.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: Fan and Mortar email res.mp4 Type: application/octet-stream Size: 6206228 bytes Desc: not available URL: </geyser-list/attachments/20160420/ff873700/attachment-0001.obj>