. Bulletin. Agriculture; Agriculture -- Arizona. 82 Bui^le;tin 86 pipe was "carbonized" in kilns with coke gas and steam and it is said that three days in the kiln were equal to two weeks of curing in air. Prior to the advent of the Sherman machine, all the sewer pipe used in Brooklyn was made by hand tamping, using natural, or "Rosendale," cement. the; schenk A pipe machine which has been used extensively in Iowa and neighboring states is the Schenk, made at Waterloo, Iowa. This was the pioneer tile machine, the first one having been built in 1906. It was the first centrif
. Bulletin. Agriculture; Agriculture -- Arizona. 82 Bui^le;tin 86 pipe was "carbonized" in kilns with coke gas and steam and it is said that three days in the kiln were equal to two weeks of curing in air. Prior to the advent of the Sherman machine, all the sewer pipe used in Brooklyn was made by hand tamping, using natural, or "Rosendale," cement. the; schenk A pipe machine which has been used extensively in Iowa and neighboring states is the Schenk, made at Waterloo, Iowa. This was the pioneer tile machine, the first one having been built in 1906. It was the first centrifugal packer, and, as might be expected, was troublesome to operate at first, but many improvements have been introduced and the Schenk has become entirely reliable. The principles of the Schenk ma- chine are very similar to those of the McCracken, the differences being in the mechanical details. The packer shaft is rotated by gearing and is ele- vated by a lever the rear end of which is controlled by a heart-shaped cam wheel, which in turn is operated by worm drive from the main shaft. The original Schenk packer-head was shaped like an ordinary earthen jug, but the one now in use has vanes and a cylindrical trowel exactly like the McCracken. The range of sizes possible with the regular No. 2 Schenk ma- chine is from 4 inches to 18 inches, with lengths of either 12 or 18 inches. There is also a Schenk sewer pipe machine with range of sizes from 4 to 30 inches, and in length either 24 or 30 inches. The Schenk is said to be a very fast machine for the smaller sizes of tile. The manufacturers guarantee that it will make 3000 feet of 6-inch straight tile per day with six men. It is not known that they have yet furnished pallets for tongue and groove pipe, but doubtless would do so if the demand warranted Fig. 8.—The Schenck packer- head, showing trowel and wings. THE NATIONAL A pipe machine, called the National, made at Boone, Iowa, dif- fers from the two preceding in that bo
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