1061. Sur la Flexion des pieds des pendules
A. MS., n.p., n.d., 43 pp.
Draft of MS. 1060.

1062. Plan of a New Reversible Pendulum
A. MS., n.p., n.d., 13 pp.

1063. [Notes for Pendulum Research]
A. MS., two notebooks, n.p., n.d.

1064. Additional Note on the Method of Coincidences
A. MS., n.p., n.d., 6 pp., incomplete.
Additions to a report on pendulum swinging.

1065. [Records of Comparisons of Meters]
A. MS., n.p., December 25, 1878-July 19, 1879, 152 pp., of which only a small percentage is in CSP's hand.

1066. Table of Excesses
A. MS., n.p., n.d., 3 pp., but not in CSP's hand.

1067. Table of Residuals
A. MS., n.p., n.d., 1 p., not in CSP's hand.

1068. Sheet Readings, Smithsonian
A. MS., notebook, n.p., December 1884-February 1885.
The title page is in CSP's hand but not much, if any, of the rest is. Data for pendulum experiments.

1069.

1070. [Coastal Survey Maps, Inventory of Instruments and Charts]
Booklet, n.p., n.d.
Page 22 of the booklet contains diagrams in CSP's hand.

1071. [Mathematical Notes on the Shape of the Earth]
A. MS., n.p., January 7-March 1914, 42 pp.

* 1072. Comparison of the Metre with a Wave-Length of Light
A. MS., n.p., n.d., pp. 1-25, 24-26, 41-83.

1073. Determination of the relative length of a wave of light and a metre bar
A. MS., n.p., [c.1879], pp. 1-7; plus single page (A1), an insert to p. 7, a variant p. 6, and a single unnumbered page.

1074. [Notes for "Determination of the relative length of a wave of light and a metre bar"]
A. MS., n.p., [c.1879], 3 pp.; plus folded sheet.

1075. Preliminary Account of the Comparison of a Wave Length with the Metre by L. M. Rutherford and C. S. Peirce
A. MS., n.p., n.d., 4 pp.

1076. Pendulum Observations
TS., n.p., [1883], 16 pp., and A. MS., n.p., December 1-10, 1884 ("Pendulum Peirce No. 1"), 1 p.
Report on an expedition to Lady Franklin Bay. Draft of G-1883-1.

1077. [Weights and Measures of Various Countries]
TS. (with notes in CSP's hand), n.p., n.d., pp. 1-40.

1078. [Notes on Weights and Measures of Various Countries]
A. MS., notebook, n.p., n.d.

1079. [Notes on Weights and Measures]
A. MS., n.p., n.d., 6 pp. (not in CSP's hand); plus a printed report from the House of Representatives on the metric system and 1 p. (in CSP's hand).

1080. Calculation of earth's mean radius vector
A. MS., n.p., n.d., 1 p.
This calculation was made for the Century Dictionary (see G-1889-3).

1081. Pendulum Experiments at Stevens Institute, Hoboken, N. J.
A. MS., notebook, n.p., August 1882.
The manuscript is in E. D. Preston's hand, but CSP is listed as Chief of Party. Comparison of time pieces.

1082. Pendulum Experiments at the Observatory of McGill College, Montreal
A. MS., notebook, n.p., September 1882.
The manuscript is partly in CSP's hand and partly in Preston's. Invariable reversible pendulums.

1083. Simple Pendulum hung by an elastic string
A. MS., n.p., n.d., pp. 1-3; plus 1 p.

1084. [Record of Pendulum Experiments]
A. MS., n.p., n.d., pp. 2-13.

1085. [Metrological Notes]
A. MS., n.p., n.d., 14 pp., not all in CSP's hand, and a notebook on the history of metrology.

1086. Note de M. Chacornac and Note de M. Charcornac sur la comete de Donate
A. MS., n.p., n.d., pp. 1-7.

1087. On the Absolute Value of Gravity
Amanuensis (Zina Fay Peirce), n.p., n.d., 6 pp.

1088. On Gravity as an Index of the Movements of the Earth's Crust
A. MS., n.p., n.d., p. 1.

1089. [On Metrology]
A. MS., n.p., n.d., 4 pp. and 7 pp., one of which contains dates (July 21-November 1, 1882).
Measurements: Egyptian, Hebrew, Greek. Metre scales compared. Determination of the length of decimetre scales.

1090. John P. Hayford's Contributions to the Science of Geodesy]
A. MS., n.p., March 20, 1914, p. 1.

1091.

1092. Six Reasons for the Prosecution of Pendulum Experiments
Printed article (annotated), G-1883-6b.

1093. Note on the Theory of the Economy of Research
A. MS., n.p., before June 4, 1877, pp. 1-10.
Draft of G-1879-5c.

1094. [Coast Survey Calculations]
A. MS., n.p., n.d., 61 pp.

* 1095. [Fragments on Pendulum Experiments]
A. MS., n.p., n.d., 509 pp.
A good part of what has been collected here appears to be material for a report or reports to the Coast and Geodetic Survey. Included are notes to superiors and subordinates in the Survey; a description of the Gravitation and Astronomical Station, Ebensburg, Cambria Co., Pennsylvania; pendulum readings at the Smithsorlian and in Ann Arbor, Ithaca, and Madison; calculation for Gautier pendulums; the comparison of a metal decimetre with a glass decimetre; notes on a clock signal and self-switch; list of books and apparatus charged to CSP; corrections to Appendices 15 and 16 of the Report of 1884. Approximately one-hundred-fifty leaves with red and blue numbers serawled on one side have been separated from the rest. These constitute a miscellaneous collection of worksheets, numbered by CSP in red from 1 to 2038 and in blue from 2038 to 1 (i.e., red number 1 is blue number 2038). Included here are records of pendulum observations for the Coast and Geodetic Survey, calculations, exploration of mathematical problems.

1096.[Fragments of Coast Survey Report of 1889]
TS., n.p., [1889], 18 pp., with CSP's corrections, and 2 photographs.
Among the fragments is a typescript of a report (?); various tables (calculation of atmospheric effects, coefficients of expansion of the pendulum, constants for calculating flexure effects, flexure per kilogram); descriptions and positions of the Smithsonian, Cornell, Ann Arbor, and Madison astronomical stations; deduction of the ratio of gravity between the different stations; general description of the pendulums and other equipment.

1097. [Charts] A. MS., n.p., n.d., 4 charts.

1098. [Fragments]
A. MS., n.p., n.d., 18 pp.; plus pp. 1-7 of a typewritten report on tide elevations and 4 pp. of TS. (bibliographical notes).