Report on the Ermont Mine Sec. 35, T. 6 S., R. 11 W., Beaverhead County, Montana

An examination of the Ermont Mine was requested by the owners, Messrs. J. R. Bowles and R. B. Caswell, to determine the amount and grade of ore developed, the advisability of constructing a mill at the present time, and to recommend future development work.

The Acropolitan - v. 6, no. 1

In this issue...Francis A. Thomson, registration, Chequamegon Cafe, Butte, Montana, M club, Mines Tennis Club, Sigma RHO, Chester H. Steele, Diamond Mine

The Acropolitan - v. 8, no. 4

In this issue...School of Mines Librarian, Margery Bedinger, Kiwanis, Medlin's Pharmacy, Commencement, Poser-Badger case, Mr. Chester Steele, Map Interpretation class

Method of Detecting System Function by Measuring Frequency Response

Methods of rapidly measuring an impedance spectrum of an energy storage device in-situ over a limited number of logarithmically distributed frequencies are described. An energy storage device is excited with a known input signal, and aresponse is measured to ascertain the impedance spectrum. An excitation signal is a limited time duration sum-of-sines consisting of a select number offrequencies. In one embodiment, magnitude and phase of each frequency ofinterest within the sum-of-sines is identified when the selected frequencies and sample rate are logarithmic integer steps greater than two. This technique requires a measurement with a duration of one period of the lowest frequency. In another embodiment, where selected frequencies are distributed in octave steps, the impedance spectrum can be determined using a captured time record that is reduced to a half-period of the lowest frequency.

The Amplifier - v. 5, no. 15

In this issue...The Anaconda Company, Gary Alexander, Mountain Climbing, Slugfest, Chester H. Steele, Copper Guards, Manuel Munoz, tennis, Lydia's

Caustic Leaching of Montana Chromite

Chromite is the most important ore used for the production of chromium and chromium alloys. At present, the domestic production is insignificant as compared with the amount of chromite consumed in the United States.