The technique of grease making, particularly in the case of the lime soap cup greases, had developed to the extent of producing homogenous, stable products of pleasing appearance and in a wide range of consistencies, long before any standardised quantitative measurement of consistency was adopted as a control test.
ELLIS, E.G. (1953), "Laboratory evaluation of lubricating greases: PART TWO. PENETRATION METHODS, ADVANTAGES, LIMITS AND VARIATIONS.", Industrial Lubrication and Tribology, Vol. 5 No. 3, pp. 13-16. https://doi.org/10.1108/eb052219
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