rnaces, by Henry
Kreisinger, C. E. Augustine, and F. K. Ovitz. 1917. 144 pp., 1 pl.,
45 figs.

BULLETIN 136. Deterioration in the heating value of coal during
storage, by H. C. Porter and F. K. Ovitz. 1917. 38 pp., 7 pls.

BULLETIN 138. Coking of Illinois coals, by F. K. Ovitz. 1917. 71
pp., 11 pls. 1 fig.

TECHNICAL PAPER 34. Experiments with furnaces for a hand-fired
return tubular boiler, by S. B. Flagg, G. C. Cook, and F. E.
Woodman. 1914. 32 pp., 1 pl., 4 figs.

TECHNICAL PAPER 50. Metallurgical coke, by A. W. Belden. 1913. 48
pp., 1 pl., 23 figs.

TECHNICAL PAPER 76. Notes on the sampling and analysis of coal, by
A. C. Fieldner. 1914. 59 pp., 6 figs.

TECHNICAL PAPER 80. Hand-firing soft coal under power-plant
boilers, by Henry Kreisinger. 1915. 83 pp., 32 figs.

TECHNICAL PAPER 97. Saving fuel in heating a house, by L. P.
Breckenridge and S. B. Flagg. 1915. 35 pp., 3 figs.

TECHNICAL PAPER 98. Effect of low-temperature oxidation on the
hydrogen in coal and the change of weight of coal in drying, by S.
H. Katz and H. C. Porter. 1917. 16 pp., 2 figs.

TECHNICAL PAPER 123. Notes on the uses of low-grade fuel in Europe,
by R. H. Fernald. 1915. 37 pp., 4 pls., 4 figs.

TECHNICAL PAPER 133. Directions for sampling coal for shipment or
delivery, by G. S. Pope. 1917. 15 pp., 1 pl.

TECHNICAL PAPER 137. Combustion in the fuel bed of hand-fired
furnaces, by Henry Kreisinger, F. K. Ovitz, and C. E. Augustine.
1916. 76 pp., 2 pls., 21 figs. 15 cents.

TECHNICAL PAPER 148. The determination of moisture in coke, by A.
C. Fieldner and W. A. Selvig. 1917. 13 pp.

TECHNICAL PAPER 170. The diffusion of oxygen through stored coal,
by S. H. Katz. 1917. 49 pp., 1 pl., 27 figs.

TECHNICAL PAPER 172. Effects of moisture on the spontaneous heating
of stored coal, by S. H. Katz and H. C. Porter. 1917. 25 pp., 1
pl., 8 figs.

PUBLICATIONS THAT MAY BE OBTAINED ONLY THROUGH THE SUPERINTENDENT
OF DOCUMENTS.

BULLETIN 8. The flow of heat through furnace walls, by W. T. Ray
and Henry Kreisinger. 1911. 32 pp., 19 figs. 5 cents.

BULLETIN 11. The purchase of coal by the Government under
specifications, with analyses of coal delivered for the fiscal year
1908-9, by G. S. Pope. 1910. 80 pp. 10 cents.

BULLETIN 13. Resume of producer-gas investigations, October 1,
1904, to June 30, 1910, by R. H. Fernald and C. D. Smith. 1911. 393
pp., 12 pls., 250 figs. 65 cents.

BULLETIN 14. Briquetting tests of lignite at Pittsburgh