Milagrito, a large, covered water-Cherenkov detector, was the world's first
air-shower-particle detector sensitive to cosmic gamma rays below 1 TeV. I
t served as a prototype for the Milagro detector and operated from February
1997 to May 1998. This paper gives a description of Milagrito, a summary o
f the operating experience, and early results that demonstrate the capabili
ties of this technique. (C) 2000 Elsevier Science B.V. All rights reserved.