Note 87 — DEVELOPMENT OF GRAVITY PENDULUMS IN THE 19th CENTURY
Reading edition
Dr. R. Schumann, “Über eine Methode, das Mitschwingen bei relativen Schweremessungen zu bestimmen,” Zeitschrift für Instrumentenkunde (January 1897), vol. 17, p. 7. The design for the stand is similar to that of Peirce’s of 1879.