Performing kitchen-table research, she developed a surface film balance technique to study soap & surfactants at the air-liquid interfaces & defined the Pockels point, the minimum area a single molecule can occupy in a monomolecular film (20 Å squared). She used a through with sliding divider, lengthwise ruler & a button lifted by an apothecary scale to measure surface tension. She could then compare the force required to lift her button from pure water, or water with various added 🧵3/