Washing and Coking Tests of Coal at the Fuel-Testing Plant, Denver, Colo. July 1, 1907, to June 30, 1908 Volume 361-370 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... //V MMUTES Figure 18.--Diagram showing temperature conditions in the furnace and on the back of panel 17. Temperature: Maximum, 56; minimum, 50; mean, 53. Relative humidity: 7 a. m., 94; 7 p. m., 100. Direction of prevailing wind, northeast. were observed; they were about 4 to 10 inches apart and extended back from the face about 2 to 4 inches. They were nearly straight in direction and could be found on both the bottom and top of each beam. The face of the portion in which the gravel was discolored had a very dead sound when tapped with a hammer, while the back had a good metallic ring. In the case of the granite there was a considerable portion from which the mortar surface had not been washed away. The remaining surfaces were washed away about J to f inch. The exposed pieces of stone were slightly discolored, being lighter than the unaffected material, but in most cases were hard and broke but little more easily than the unheated ones. The mortar was soft and crumbled about 1J inch. For about 3 inches in from the face the mortar had turned a light straw color, but was quite hard. For about 6 inches from the face the concrete had a whitish tinge, which indicated that the free moisture had been driven entirely out. This whitish layer was apparently as hard as the layer on the back. To a depth of about 2 inches the pieces of stone had a rather cloudy look. Vertical cracks ran directly back from the face on both the top and bottom of the beam; they were from 2 to 6 inches apart and extended back from the face 4 inches. By tapping, the beams could be broken across these cracks. The face had a very dead sound when tapped with the hammer; the back had the usual metallic ring. In the case of the cinder a part of the face was still intact after the application o...