LOWER DECK OF BLIND SHAFT BORER SHOWING ONE OF THE SIX, 125-HORSEPOWER ELECTRIC DRIVE MOTORS.
ART OF GRIPPERR RING AND CYLINDER MOTORS FOR THE BIT CUTTER HEAD. THE BLIND SHAFT BORER SYSTEM IS A NEW CONCEPT FOR BORING VERTICAL COAL MINE SHAFTS. THE BORER MACHINE IS UNIQUE AS IT IS THE ONLY ONE OF ITS KIND IN THE WORLD, AND IS EXPECTED TO SIGNIFICANTLY REDUCE THE TUME REQUIRED TO DEVELOP NEW COAL MINES. THE MACHINE IS OVER 24 FEET IN DIAMETER, NEARLY 60 FEET HIGH, WEIGHS 350 TONS, AND CAN BORE 40 FEET PER 24-HOUR DAY. THE TOTAL SYSTEM INCORPORATES CONVENTIONAL HOISTING AND CONCRETE LINING EQUIPMENT. THE INITIAL FIELD TRIAL IS AT U.S. STEEL'S OAK GROVE MINE, AND TESTING STARTED IN EARLY DECEMBER AND WILL CONTINUE INTO THE SPRING 1979.
For more information or additional images, please contact 202-586-5251.
May 19, 2014
Why is this picture in the Public Domain?
Produced by United States Government
The file available on this page is a work of the United States government. A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U.S. government as part of that person's official duties." In general, under section 105 of the Copyright Act, such works are not entitled to domestic copyright protection under U.S. law.
How may I use a Public Domain picture?
The file available on this page in the Public Domain. Files in the public domain have no restrictions on use and may be used for any purpose, without any conditions, commercial or not, unless such conditions are required by law.
Possible Prohibited Uses
Although a file is in the public domain, the work may still have some restrictions for use if it contains any of the following elements:
- File contains an identifiable person and such person has not provided a model release.
- File contains an identifiable building or structure and the owner of such building has not provided a property release.
- File contains a registered corporate logo or trademark.
Files containing any of the above elements that do not also have a provided release would generally fall under editorial uses only and may not be used for commercial purposes. Users downloading files that are designated as "editorial use" assume full responsibility for their use of the file(s). Depending on your use, the use of editorial use files may require additional rights that publicdomainfiles.com or the copyright owner may or may not be able to provide. You should consult with your legal counsel to be sure your use is legal.
By downloading this file, you indicate that you understand and agree to all of these terms and assume full liability for your use of the file(s) and agree to hold publicdomainfiles.com harmless should any liability arise.