282 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS function or series of functions. Shampoos, conditioning rinses, syntheti(5 bar soaps, face creams, hand lotions, etc., are all possible with the use oH one or more of the fatty amino acid derivatives. SUMMA RY A new family of amphoteric surface active agents based on the conden4 sation of a fatty primary amine and methyl acrylate have been made avail-I able commercially in. both monoadduct and diadduct forms and in a vat4 iety of fatty chain lengths. Their flexibility as to chemical structure andl their amphoteric polyfunctionality combine to provide an extremely ver• satile family of products offering promise in a wide variety of applications.I These fatty amino acid derivatives are particularly adapted to cosmetici formulations, offering controlled surface active properties, compatibilityl with a wide range of products, mildness and polyfunctionality. ROTATIONAL METHODS OF FLOW MEASUREMENTS* WALTER K. ASBECK Union Carbide Chemicals Company, South Charleston, 14•. ?a. A LARGE NUMBER of various types of rotational viscometers are obtain- able commercially, and many more are described in the current literature. Some special advantage over available apparatus is usually claimed for each new instrument which is described. Often a very specialized knowl- edge of the field of rheology and the specific application of a given instru- ment is consequently required before an adequate choice of apparatus and the results which it may be expected to yield can be made. To aid in this choice, it is pertinent to consider the various aspects of rotational viscom- eters, and those related to them, and to determine their advantages and limitations. With this background a more adequate choice of commercial apparatus can be made, or the design of special equipment to meet specific needs can be more rapidly accomplished. Although today theology is playing an important and ever increasing role in industrial control and research, it was not until the latter part of the 18th century that Coulomb (l) laid the foundation for rotational' type viscometers. In order to substantiate the derivations earlier carried out by Newton (2) for viscous flow, he suspended a circular plate from a * Presented at the October 4,1956, Seminar, New York City.

282 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS function or series of functions. Shampoos, conditioning rinses, syntheti(5 bar soaps, face creams, hand lotions, etc., are all possible with the use oH one or more of the fatty amino acid derivatives. SUMMA RY A new family of amphoteric surface active agents based on the conden4 sation of a fatty primary amine and methyl acrylate have been made avail-I able commercially in. both monoadduct and diadduct forms and in a vat4 iety of fatty chain lengths. Their flexibility as to chemical structure andl their amphoteric polyfunctionality combine to provide an extremely ver• satile family of products offering promise in a wide variety of applications.I These fatty amino acid derivatives are particularly adapted to cosmetici formulations, offering controlled surface active properties, compatibilityl with a wide range of products, mildness and polyfunctionality. ROTATIONAL METHODS OF FLOW MEASUREMENTS* WALTER K. ASBECK Union Carbide Chemicals Company, South Charleston, 14•. ?a. A LARGE NUMBER of various types of rotational viscometers are obtain- able commercially, and many more are described in the current literature. Some special advantage over available apparatus is usually claimed for each new instrument which is described. Often a very specialized knowl- edge of the field of rheology and the specific application of a given instru- ment is consequently required before an adequate choice of apparatus and the results which it may be expected to yield can be made. To aid in this choice, it is pertinent to consider the various aspects of rotational viscom- eters, and those related to them, and to determine their advantages and limitations. With this background a more adequate choice of commercial apparatus can be made, or the design of special equipment to meet specific needs can be more rapidly accomplished. Although today theology is playing an important and ever increasing role in industrial control and research, it was not until the latter part of the 18th century that Coulomb (l) laid the foundation for rotational' type viscometers. In order to substantiate the derivations earlier carried out by Newton (2) for viscous flow, he suspended a circular plate from a * Presented at the October 4,1956, Seminar, New York City.