Report upon the primary triangulation of the United States Lake survey
pt. I. Historical account of the survey of the northern and northwestern lakes, May 1841 to July 1 1881.--pt. II. Standards of length, bases, and base-apparatus.--pt. III. Primary triangulation.--pt. IV. Astronomical determinations.--pt. V. Principal results of the geodetic work.--Appendices: I. Additional data relative to metre 1876. II. Slow return to zinc bar Z to its original length, after being heated. III. Difference of longitude between Detroit, Mich., and Cambridge, Mass. IV. Magnetic work of the Lake survey
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