. Bulletin der US-Landwirtschaft. Landwirtschaft Die Landwirtschaft. &Amp; J 9 * $ mru Washington, DC PROFESSIONAL PAPIER November 10, 1915 Aushub eingesetzten Maschinen in der GRUNDSTÜCKSENTWÄSSERUNG. Von D. L. Yaenell, Entwässerung Ingenieur. Inhalt. Einführung 1 Entwicklung der Aushub Maschinen 2 Das schwimmende Pendelarm Bagger' 3 Die floating Grab-Schaufel Bagger 17 Drag-line Grader Bagger 18 Die trocken-land Pendelarm Bagger 25 Die trocken-land Grab-Schaufel Bagger 28 Die templet Bagger 28 das Rad Art der Bagger 30 Der hydraulische Bagger 33 Maschinen für die Reinigung von alten Gräben 35 Zusammenfassung 37 EINLEITUNG

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. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. &J9*$mru Washington, D. C. PROFESSIONAL PAPER November 10, 1915 EXCAVATING MACHINERY USED IN LAND DRAINAGE. By D. L. Yaenell, Drainage Engineer. CONTENTS. Introduction 1 Development of excavating machinery 2 The floating dipper dredge ' 3 The floating grab-bucket dredge 17 The drag-line scraper excavator 18 The dry-land dipper excavator 25 The dry-land grab-bucket excavator 28 The templet excavator 28 The wheel type of excavator 30 The hydraulic dredge 33 Machines for cleaning old ditches 35 Summary 37 INTRODUCTION. The excavation of nearly all drainage ditches, other than mere field drains, and a large part of the levee work are now done By power machinery. In the carrying out of community drainage projects in agricultural districts it is often the case that persons upon whom must devolve the ultimate responsibility for the correct design and proper prosecution of the work are but little experienced in the applicability of the different types of excavating machines, and have little practical knowledge of the methods and cost of operation of such machinery. This is frequently true of county drainage commissioners, drainage district commissioners, and of local engineers who, though of limited experience in the technicalities of ditch and levee construction on a large scale, are nevertheless, by virtue of their office, called upon to originate or pass upon plans for drainage improvements, draw up specifications, and award contracts. It is for the purpose of supplying information that would be useful in such cases that this bulletin has been prepared. In obtaining the information embodied in this bulletin the writer has been aided materially by data furnished by private engineers in charge of improvements and by various contractors and manufacturers. Note.—This bulletin is of interest to those who have to do with the installation of systems of drainage; it is suitable for distribution in

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• bookauth
• bookcentury1900
• bookdecade1910
• booksubjectagriculture