This photo was viewed 25 times and was downloaded in full size 0 times.

This photo was liked 0 times

If you are a member, please login in order to see the source link of the above image.


This is a photo of the National Register of Historic Places listing with reference number 74001732

English: Dedication of the Experimental Mine, which opened in 1910, Bruceton, Pennsylvania. According to the CDC/NIOSH website: "In 1910, the newly created U.S. Bureau of Mines leased a 38-acre tract of land from the Pittsburgh Coal Co. in Bruceton, about 13 miles south of Pittsburgh. Here, a new mine, known as the Experimental Mine, was opened. One of the early experiments in the Experimental Mine demonstrated that coal dust by itself was capable of propagating an explosion even in the absence of any methane gas. This demonstration was contrary to the old belief widely held at the time that coal dust could not explode without gas. This view had led to the very dangerous and widespread practice of using loose coal dust in mines to pack explosives in boreholes, which had cost many thousands of lives. These early experiments clearly proved that such a practice was too hazardous to continue."[1]
Date 1910(1910)
Source Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health
Image description page: http://www.cdc.gov/niosh/mining/aboutus/history.htm, accessed 2009-11-17
Image page: http://www.cdc.gov/niosh/mining/aboutus/images/history/ExpMinededication.jpg, accessed 2009-11-17
Author United States Department of the Interior / United States Bureau of Mines (1910); specific persons unknown
(Reusing this file)
Public domain
This image is a work of the United States Department of the Interior, taken or made during the course of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.
Public domain

Object location

40° 18' 18.08" N, 79° 58' 51.49" W

This and other images at their locations on: Google Maps - Google Earth - OpenStreetMap - Proximityrama (Info)
Public Domain

Only registered users can post comments. Please login.

EXIF data:
File name experimentalminepa.jpg
Size, Mbytes 0.12752734375
Mime type image/jpeg

See some ads as well as other free photos:

The images at Free-Photos.biz come mainly from Wikimedia Commons or from our own production. The photos are either in the public domain, or licensed under free linceses: Free-Photos.biz license, GPL, Creative Commons or Free-Art license. Some very few other photos where uploaded to Free-Photos.biz by our users and released into the public domain or into free usage under another free license (like GPL etc.)

While the copyright and licensing information supplied for each photo is believed to be accurate, Free-Photos.biz does not provide any warranty regarding the copyright status or correctness of licensing terms. If you decide to reuse the images from Free-Photos.biz, you should verify the copyright status of each image just as you would when obtaining images from other sources.

The use of depictions of living or deceased persons may be restricted in some jurisdictions by laws regarding personality rights. Such images are exhibited at Free-Photos.biz as works of art that serve higher artistic interests.

christianity portal