NEW BOOKS E. E. Line Coordinate Charts for Vapor Pressure-Temperature Data. By FRANK GERMANN and ODINS. KNIGHT. 2 charts, 22.9 x 61 cm. University of Colorado, Boulder, Colorado. Price: $2.00. One of the great obstacles in physical, organic, and industrial laboratories has been the lack of a t least approximate vapor pressure-temperature data. The authors have supplied this need by the production of a line coordinate chart based on the integrated form of the Clausius-Clapeyron equation. The reciprocals of the absolute temperatures have been plotted against the logarithms of the vapor pressures over the range of 500 to 900 mm. The vapor pressures obtained by various authors have been studied, and weighted curves drawn. In all cases the individual variations among the results for a given compound are greater than the possible error made in assuming the lines to be straight. The 183 compounds given are conveniently separated into chain and ring compounds. Each class is provided with two scales: chain compounds, 0" to 125°C. and 105" to 230°C.; ring compounds, 65' to 225°C. and 185" to 390°C. The use of these charts makes calculations for corrections in boiling points due to variation in pressure unnecessary. The charts permit temperature readings within 0.25"C. if the pressure is known, or pressures within 2 mm. if the temperature is known. A knowledge of the prevailing barometer pressure only is required. Ample directions are given for the interpolation of boiling point or of vapor pressure values, and for the insertion of new data as i t may appear. These charts will meet a long-felt want in all laboratories, whether a t sea-level or at higher altitudes. J. N. PEARCE. The Solid Products of the Carbonization of Coal. Chemical Department, South Metropolitan Gas Co. Paper cover; 123 pp.; 41 figures; 45 tables. London: South Metropolitan Gas Co., 709 Old Kent Road, S.E. 15, 1934. This monograph gives the results of an original investigation conducted by the chemical staff of the South Metropolitan Gas Co. over a period of several years in an endeavor t o increase the use of coke as a domestic fuel. Following a short introduction, Chapter 11, on an investigation into the possibility of producing by the carbonization of coal a smokeless solid fuel suitable for the domestic grate fire, describes test methods for determining the ignition temperature, combustibility, reactivity to carbon dioxide, steam, and sulfuric acid, and electrical conductivity of cokes and chars. Application of these tests to a series of cokes made a t increasingly higher carbonizing temperatures, ranging from 500 to 1050"C., showed that reactivity to air, carbon dioxide, steam, and sulfuric acid decreased and electrical conductivity increased with increasing temperature of carbonization. These changes in coke characteristics were most marked a t about 700°C. Carbonization temperature and coincided with the change in appearance from a dull black t o the characteristic silvery sheen of high temperature coke. The absorptive capacity of the cokes for carbon dioxide increased sharply with increasing temperature of carbonization u p to a maximum a t 700"C., and then fell rapidly. Deposition of graphitic carbon reduced slightly the reactivity of the high temperature cokes but 741
