title: Wilhelmy plate artifacts in elastic monolayers.
abstract: A recent article [L. Pocivavsek et al., Soft Matter4, 2019 (2008)] by some of us pointed out difficulties in interpreting Wilhelmy plate measurements on elastic Langmuir monolayers that support anisotropic stress. Using a simplified geometry it showed conditions in which the Wilhelmy plate measures significantly different stress from the ambient stress. We correct a serious error in this analysis and strengthen its conclusion, showing that the Wilhelmy stress and the ambient stress can have opposite signs.
authors.forename: T A
authors.initials: TA
authors.lastname: Witten
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Pocivavsek
authors.forename: K Y C
authors.initials: KY
authors.lastname: Lee