This book is a unique publishing event in the field of fluid mechanics. Since its arrival, I have seen many small clusters of enraptured graduate students work through its rich offerings. The book contains 166 pages of photographs of fluid motion displaying a wide variety of phenomena, utilizing many different flow-visualization techniques. The only text beyond a short introduction are the figure captions, which contain a description of the phenomenon, an interpretation, and a reference to the original work or a credit. The phenomena include low Reynolds number flows, separation, vortices, flow instability, turbulence, free-surface flow, convection, subsonic flow, shock waves, and supersonic flow. The book has the power to excite and inform students about the complexity of possible fluid motions, arising even in simple geometries. Its price is low and its quality is so high that instructors can recommend it without reservation as a supplemental text or for independent study at both the undergraduate and graduate level. No faculty member who teaches fluid mechanics should be without a copy. The clothbound version would make an ideal gift or coffeetable book for any one with an interest in the natural sciences. The high artistic quality of many of the photographs will also appeal to those of a more general audience who chance to come upon this book. One unfortunate feature is the absence of color photographs. Although there are many such photos available, which would have added to the appeal of the book, it is clear that they would have increased the cost well beyond the current price. This book, at this price, is certainly to be recommended.

No abstract

The paper re-analyzes the results of earlier, very precise measuremen~s of the viscosity of water at essentially atmospheric pressure. This is done in terms of a new, theoretically-based equation for the operation of a capillary viscometer rather than in terms of semi-empirical equations used by the original authors. The new analysis eliminates possible systematic errors and permits the establishment of reaJistic error bounds for water in its role as a standard reference substance for viscosity. The latter are smaller than those embodied in the most recent International Formulation. Btandarct values of the ratIo of vIscosIty at a temperature T to its value at 20 °0 have been derived from the re-analyzed data because the uncertainity of this ratio is an order Of magnitude smaller than that of the absolute values. The ratios are used to generate absolute values with the aid of the standard NBS datum p.= 1002.0 p'Pa s at 20 0 0. The viscosity ratiOS have been correlated with the ald of two empirical equations. The more accurate equation covers the range OOO::::t:::: 40 °0 with an unce'rtaintyof ± 0.05%.