WATER SUPPLY. 61 
destroyed its record would still have a definite meaning, and the relative 
height of a new standard could be ascertained with precision. In this 
undertaking I was joined by Mr. Jesse W. Fox, a gentleman who has 
long held. the office of territorial surveyor of Utah. A suitable stone 
was furnished by the Hon. Brigham Young, and was carried to Black 
Rock without charge through the courtesy of Mr. Heber P. Kimball, 
superintendent of the Utah Western Railroad. The block is of granite, 
and is three feet in length. It was sunk in the earth, all but a few inches, 
on the northern slope of a small limestone knoll just south of the railroad 
track at Black Rock. Its top is dressed square, about 10 LO inches, and is 
marked with a+. It will be convenient to speak of the top of this monu- 
ment as the Black Rock bench. On the 11th of July, 1877, the surface of 
the lake was 34.5 feet below the bench, and it then marked 2.0 feet on the 
pillar erected by Dr. Park. The zero of the observation pillar is therefore 
36.5 feet below the bench. 
The accompanying topographic sketch will serve at any time to identify 
the position of the bench. 
After consultation with Dr. Park, I concluded that it would be better 
not to depend on the Black Rock station for observations in the future—at 
least in the immediate future—and other points were discussed. Eventually 
it was determined to establish a new station near Farmington, on the eastern 
shore of the lake. The point selected is in an inlet so sheltered that a 
heavy swell in the lake will not interfere with accurate observation. At 
the present stage of water the spot is well adapted to the purpose, and it 
can be used with the water 2 feet lower or 5 feet higher. I was not able 
to attend personally to the erection of the pillar, but left the matter in the 
hands of Mr. Jacob Miller, of Farmington, who writes me that it was placed 
in position and the record begun on the 24th of November, 1877. The 
pillar is of wood, and is graduated to inches for 9 feet of its length. 
On the day of its establishment the reading of the water surface was 2 
feet 1 inch. On the 21st of January, 1878, the reading was 2 feet 13 inches. 
The Farmington and Black Rock pillars are 23 miles apart. The 
relative height of their zeros will be ascertained as soon as practicable by 
making coincident readings, during still weather, of the water surface at 
