On the calculation of surface tension from measurements of pendant drops The calculations presented are an extension of the work of Bashforth & Adams (1883) to give the shapes of pendant drops of liquids for values of fi from -0-25 to -0-6 at intervals of 0*025. The results have been used to calculate, to an accuracy of 0-001 to 0*01 %, the con stants needed for measuring surface and interfacial tensions by the method suggested by Andreas, Hauser & Tucker (1938), which has thus been made independent of calibration.