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Excerpt from Gold Dredging in the United StatesTypes of hand drills- Empire drill- New type of light power drill- Determining period of dredging project- Selection of dredge for a given project- Use of unusual type of drill in Alaska- Details ofMoreExcerpt from Gold Dredging in the United StatesTypes of hand drills- Empire drill- New type of light power drill- Determining period of dredging project- Selection of dredge for a given project- Use of unusual type of drill in Alaska- Details of construction of gold dredges- Determining suitable size of dredge- Bucket line and tumblers- Pins- Lower tumbler- Upper tumbler- Main drive- Winches- Ladder-hoist winch- Swing winch- Spuds and spud supports- Hulls and superstructures- Bow gantry- Ladder rollers and bearings- Main hopper, save-all, and bucket idlers- Screen and screen drive- Distributor- Stacker- Belts- Guide rollers- Wire ropes- General details of dredge construction- Special steels for dredge parts- Properties of alloys of steel- Manganese steel- Nickel steel- Nickel-chrome steel- High-carbon steel- Electrical equipment on dredges- Bucket-drive motor- Power consumption by electrical equipment- Recent type of direct-connected motor drive- Kind of electric current used- Voltage of current used on dredges- Rebuilt dredges- Feasibility of moving dredges or machinery- Examples of second use of dredges or machinery- Tin Cup dredge- Scott River dredge- Butte dredge- El Oro No. 1 dredge- Dredge near Leadville, Colo- Castle Creek dredge- Feature to be considered in removal of dredging equipment- Other examples of moving dredge- Operation of gold dredges- Essentials of dredge operation- Ample spare parts should be availableAbout the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully- any imperfections that remain are intentionally left to preserve the state of such historical works.