A New Treatment of Suspension Wire for Hydrostatic Weighing

Abstract

A new treatment of the suspension wire in hydrostatic weighing is developed in order to decrease the error which is caused by the instability of the meniscus.
The suspension wire is coated by silicone oil, and is heated at a temperature of about 250°C or about 500°C. Two kinds of the suspension wire are then obtained, namely, the one coated at the lower temperature has a repellent surface and the other at the higher temperature has a dampish surface. The repellent surface becomes dampish by thermal oxidization at the high temperature.
The repellent wires are comparable to those of platinum black coating hitherto obtained, while the dampish wires satisfactorily show higher reliabilityy to hydrostatic weighings. The standard deviations of the latter wires are several micrograms in case of wires with a diameter of 0. 1 to 0.2mm. and are little different from ordinary weighing in air.