Historical astronomical records can play an important role in modern research, especially in the case of ancient Chinese observational data: sunspot and aurora records are important for the study of solar variability; solar and lunar eclipse records for the study of the Earth's rotation; records of Comet Hally for the study of orbital evolution; "guest star" records for the study of supernova remnants; planetary conjunction records for research in astronomical chronology. In the past, Western scientists have not been able to exploit these valuable data fully because the original records were difficult to gather and interpret, and complete English translations have not been available. East-Asian Archaeoastronomy is the first comprehensive translation into English of such historical records for modern research. The book also features an introduction to East Asian astronomy and offers guidance on how to use the records effectively. It will not only be a valuable research tool for astronomers but should also be of great interest to historians of China and Chinese science.
Author: C. D. Hendricks
Release Date: 1962
The coalescence of two colliding water drops was studied by determining the surface deformation of the half-drops before coalescence in a controlled atmosphere. The surface deformation and delay time before coalescence were determined at two impact velocities, at approximately zero, 50 and 97 percent relative humidity, and at an ambient temperature of approximately 27C. The experimental results indicate that the delay time before coalescence increases with higher humidities in both the slow and rapid collisions. At the same humidity and temperature the delay time is less in the slow collision than in the rapid collision. An electric potential difference between the drops decreases the delay time in coalescence and greatly affects the surface deformation. (Author).