Personnel 1875-'76.

Time employed.

OFFICERS, ACTING ASSISTANT SURGEONS, ETC.

First Lieut. George M. Wheeler, Corps of Engineers, in charge
First Lieut. William L. Marshall, Corps of Engineers...
First Lieut. Eric Bergland, Corps of Engineers..
First Lieut. W. L. Carpenter, Ninth Infantry

First Lieut. Rogers Biruie, jr., Thirteenth Infantry.
First Lieut. Charles C. Morrison, Sixth Cavalry.
First Lieut. C. W. Whipple, Ordnance Corps.
Second Lient. M. M. Macomb, Fourth Artillery
Acting Assistant Surgeon H. C. Yarrow, (zoölogist).
Acting Assistant Surgeon J. T. Rothrock, (botanist)
Hospital Steward T. V. Brown, (recorder and computer).

July 1, 1875, to January 15, 1876.
Api il 24, 1876, to end of year.
July 1, 1875, to January 1, 1876.
July 1, 1875, to June 1, 1876.

July 1875, to November 22, 1875.

A. R. Conkling.

Jules Marcon
Douglas A. Joy.

Dr. Oscar Loew

GEOLOGISTS.

MINERALOGIST AND CHEMIST.

The whole year.

Do.

July 1, 1875, to November 30, 1875.

The gentlemen named in my last annual report have continued to extend cheerful assistance in the completion of results to the point of final publication in the natural-history branch, and I take this occasion to tender to them a merited recognition of their kindness.

The officers of the supply departments of the Army and of the military departments, districts, and posts touched by the different parties of the survey, have extended valuable assistance.

ASTRONOMICAL.

In this branch of the survey no work was accomplished during the year at main stations, since a large number of these had been occupied in former years, and measured and developed bases in the immediate vicinity of those bordering on the fields of survey had been completed. The usual observations for latitude at selected points along the routes of travel were made by the officers in charge of parties, and the results therefrom are given in a tabulated statement, as well as those of prior years. It was found impracticable to complete the dome and middle room of the observatory at Ogden for want of time and means. The telegraph lines southward from Santa Fé having reached Mesilla, New Mexico, and that west from San Antonio, Texas, Fort Stockton, it is improbable that during the fiscal year El Paso will have been connected both north and east, and further work accomplished in the direction of making a circuit from that point in the vicinity of the thirty-second parallel to San Diego. No further steps have been taken in the direction of securing sites for more or less permanent field observatories, but my recommendations of the past year are renewed.

Herewith is given the latitude of points determined by parties of the expeditions during several years and not elsewhere published.

15 CE

1869

Camp Ruby, Nev

Geographical positions by measurement from or by trigonometrical connection with main astronomical points.

Remarks.

Louis Nell...

Difference in longitude and lati-
tude determined by triangula-
tion in 1872. At this time no
flag-staff had been erected, and
the object fixed was a building,
the only one then in course of
construction.

By chaining from monument in
Mormon Observatory, Temple
square, Salt Lake City.
By chaining; old flag-staff since
removed, but stump left stand-
ing as bench-mark.
Approximate difference between
astronomical observing pier and
fort, taken from Land-Office
plats. The position of the mon-
ument as located by J. H.
Clark and the center of fort as
given by Land-Office assumed
as position of flag-staff.
Difference between monument
and flag-staff determined from
plats and measurements by J. E.
Weyss, and are given as approxi-

mate.