An investigation, apparently the first, was made of boiling heat transfer coefficients between immiscible liquids. Mercury with one of water, methanol or ethanol was used. The apparatus was a 2.5 in diameter glass tube with mercury heated by an external heating wire and the pool boiling liquid above. The data covered the range dT = 7"-103"F, q = 1500-110000 Btu/ft' h with h = 20&1800 Btu/fP h "F. Neither a peak flux nor a decline in h were reached. Resume-Une recherche, apparemment la premiere, a CtC effectuee sur le coefficient de transmission de chaleur par ebullition entre des liquides non miscibles. Le mercure avec de l'eau, de l'alcool Bthylique ou de l'alcool methyl'que a tte utilise. L'appareil est un tube de verre de 25 in. de diamttre contenant du mercure chauffe par une resistance exterieure; la nappe de liquide en ebulhtion se trouve a la surface du mercure. Les donnees couvrent le domaine .4T = 7-103°F. 4 = 1500-110 000 Btu/fP h avec

It is shown that in a structurally controlled lead-acid cell the electrodes, in addition to their electrochemical function, also provide evolved gas recombination sites. The reaction kinetics and the transport properties in the acid electrolyte solution are making the process possible at practical rates. Typical recombination rates for oxygen are of the order of 15 mA/cm 2 (C/10). For hydrogen, the observed starting rate of recombination exceeds self-discharge evolution in a lead-calcium system by a factor of at least 30. A review of various operational characteristics is given including half-cell potentials, cell voltages, internal pressures, and hydrogen partial pressures.

A reserve battery is described that can operate over a wide temperature range, including temperatures as low as --60~ at coulombic efficiencies of 16% or better. The battery is based on the system: lead/fluoroboric acid/lead dioxide and utilizes a bonded lead dioxide cathode. The system is discussed based on data such as: capacities, current-voltage relationships, and coulombic efficiencies, as a function of temperature; self-discharge characteristics; specific energy; and cost considerations.

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