2026-10-08 Science History Institute, sciencehistory.org

Page: 'Under Pressure', Distillations magazine, 15 May 2025. [web] https://www.sciencehistory.org/stories/magazine/under-pressure/ (saved research/pages/shi-under-pressure.html). Found through the Google query on Lecher and Pernter (side result).

Findings (claim 7, glaciers and regelation): - Forbes (from 1841 at Agassiz's station) deduced glaciers were viscous; Tyndall, "Drawing on Michael Faraday's 'regelation' experiments ... asserted that the force propelling glaciers was not viscosity but the breaking of ice under the pressure of its own weight and subsequent refreezing when pressure reduced." - Tyndall "bragging in a letter that he 'so utterly annihilated it that its author will hardly acknowledge it'"; he accused Forbes of taking the theory from Louis Rendu; an ally said Tyndall had "run an oiled rapier" through Forbes. Forbes "maintained that the clashing theories were in fact complementary"; Forbes, 1864: "For about three years I have felt disheartened and hopeless as to stemming the popular tide of propositions against my Theory of Glaciers". - Later: Walthere Spring (Belgium, 1880s) took the work toward pressure; Forel's report in Science. Bearing: claim 7; the folder's Heat Ch. VI is Tyndall's side (interested party). This article reports Forbes's view that viscosity and regelation are complementary, which matches the deep read's note that Tyndall himself grants viscous-like behaviour under pressure (Heat para 235).