Old Faithful Geyser, four August 1997 interval sequences. Units: minutes. Calculated from NPS logbook mixed-unit intervals as posted to geysers@wwc.edu on 4-Oct-97 by Lynn Stephens. 26-Aug 27-Aug 28-Aug 29-Aug 88 97 48 86 60 51 102 78 86 86 51 79 62 56 101 78 85 93 51 89 62 54 84 81 90 90 58 55 52 51 90 85 90 90 59 74 52 62 99 58