Excerpt from Terrestrial Magnetism and Atmospheric Electricity, Vol. 16: An International Quarterly Journal, March December, 1911
The land operations of the Department of Terrestrial Magnetism of the Carnegie Institution of Washington especially in regions more or less difficult of access, have emphasized the need of more portable and more compact instrumental outfits than heretofore in general use, without at the same time sacrifice in requisite accuracy. For the regions here considered, in which the greater part of our work must be done, travel is usually difficult and a bulky and heavy equipment is, accordingly, a serious obstacle to safe transportation and rapid work. The conditions imposed make imperative also the omission of complicated and intricate mechanical devices, the adjustments of which are generally difficult to make and maintain, as well as the avoidance of a great number of loose accessory parts, the loss of any one of which may mean at times either the discontinuance or at least the serious interruption of a campaign. Another essential feature in work of this kind is that the outfit be such to admit advantage being taken of every opportunity for observations; the construction therefore should permit practically immediate use and not require what may be the best part of the available time for setting up and assembling various parts.
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