OLD FAITHFUL GEYSER, Yellowstone National Park. Nathaniel P. Langford, a member of the 1870 Yellowstone party, kept a diary of the month's explorations that led eventually to the establishment of today's far flung National Park System. Langford says in his entry for September 19: "We gave such names to those of the geysers which we saw in action as we think will best illustrate their peculiarities. The one I have just described General Washburn has named 'Old Faithful,' because of the regularity of its eruptions, the intervals between which being from sixty to sixty-five minutes." General Washburn was the leader of the expedition. Langford became the first superintendent of the park—at no salary. (Photograph by Haynes Studios, Inc.)