Volume 9, Issue 2, 01 February 1938
Index of content:
9(1938); http://dx.doi.org/10.1063/1.1710401View Description Hide Description
9(1938); http://dx.doi.org/10.1063/1.1710392View Description Hide Description
9(1938); http://dx.doi.org/10.1063/1.1710393View Description Hide Description
The experimental curve is determined which shows the relation between the flow of blood in cubic centimeters per minute and the deflection of the galvanometer in millimeters for a range of flows between zero and about 3 cc per minute. The curve is similar to that calculated by Burton for the Rein thermostromuhr and that experimentally obtained by Jongbloed and Noyons with their aerothermorheograph. The maximal deflection of the galvanometer occurs at a flow (Ringer's solution) of about 0.08 cc per minute and for smaller or greater flows the deflection decreases. Since the deflection of the galvanometer approaches zero for very small flows and becomes zero for cessation of flow, whereas it usually decreases for increase of flow, one must be careful to distinguish between a cessation of flow and an increase. Difficulty will not arise if sufficient time is allowed for the establishment of thermal equilibrium. Certain controversies have arisen because this particular limitation of Rein's thermostromuhr was disregarded. The method, as we use it, is wholly unsuited for indicating variations in blood flow which occur in less than sixty seconds. It may be very reliable for indicating changes in blood flow which occur over a longer period of time.
9(1938); http://dx.doi.org/10.1063/1.1710394View Description Hide Description
The critical temperature of glass surface for condensation of mercury vapor as a function of density of atoms striking the surface has been found. The results indicate a large nucleus composed of many atoms is necessary for condensation to start; the heat of vaporization of an atom from the nucleus is 13.2 kcal. per mole. Some qualitative observations are reported, showing both rapid and slow adsorption of mercury atoms on glass and metal, and a considerable adsorption of mercury ions.
9(1938); http://dx.doi.org/10.1063/1.1710395View Description Hide Description
A simple method of analyzing lightning photographs taken with moving film cameras is described. The results of analysis of two air discharges with some interesting features and one very unusual type of discharge are presented. Certain discharges at the close of storms and the correlation of electrical and photographic measurements are discussed.