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Laboratory Studies on High Temperature-Short Time Sterilized Evaporated Milk. I. Easily Constructed Eccentric Falling Ball Type Bomb Microviscometers Suitable for Containing Biological Materials During Sterilization and Storage

Dairy Products Laboratory, Eastern Utilization Research and Development Division, USDA, Washington 25, D. C.

ABSTRACT

A simple eccentric falling ball type bomb micro viscometer is described. This instrument, which lends itself to easy construction in large numbers, is suitable for containing, sterilizing, and storing of milk, milk concentrates, and other biological liquids. Samples as small as 0.01 ml. may be processed and stored. Viscosity measurements may be made before and after sterilization and during storage. The operational characteristics of these microviscometers have been considered in the light of the empirical and semiempirical relationships which apply to falling ball viscometers of the eccentric type. These relationships have been shown to extend to the very small diameter tubes and spheres employed in the construction of the bomb microviscometers. The effect of the angle of inclination on the instrument constant has been determined and this effect furnishes a basis for the rejection of malfunctioning viscometers.