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Fixed grip carrier #103 at Steamboat Springs, Colorado
Steamboat load test accident; see article Danger-Load Test in Progress (Ski Area Management) by Charles F. Dwyer. -
General view of fall of bolted roof
Rock debris with detached bolts from a rock fall is shown in an unidentified underground mine. -
Cutting machine in travel-way
Two miners ride a cutting machine in a travel-way underground. The image shows close views of roof bolts. -
Drilling first of four holes for anchor bolts
Three miners are shown drilling holes for anchor bolts underground at an unidentified mine. -
Bolted roof in haulage-way
The image shows roof bolts in a haulage way with two men in a trolley, underground in a coal mine. -
Roof bolts and channels supporting high roof
Three men stand in a tunnel with a high roof underground at an unidentified mine. -
Thinly bedded structure of immediate roof
The thinly bedded structure of a sedimentary rock is shown underground at an unidentified mine. -
Drilling hole for anchor bolt at end of channel
Three miners are shown drilling holes for anchor bolts underground at an unidentified mine. -
Vertically installed roof bolts at working face
Two miners stand at a working face of what may be a coal mine. One miner points to the roof bolts. -
Roof and ribs at intersection secured with roof bolts
Roof bolts are shown on the roof of an intersection underground at an unidentified mine. -
Huron Portland Cement Company, foot-treadle control on engine lathe
The Huron Portland Cement Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was producing cement by 1907. By 1910 it had become the largest cement producer in the world, using limestone ... -
Huron Portland Cement Company, worker operating sheet rolls
A man operates sheet rolls with his foot on the control button, at a machine shop of the Huron Portland Cement Company. The Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was producing ... -
Huron Portland Cement Company, canopy-type hoods over grinding wheels
Hoods over grinding wheels provide safety for workers and are probably at an operational site of the Huron Portland Cement Company. The Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was ... -
Warning sign, Huron Portland Cement Company shop
A warning sign reading "STOP" extends out at the entrance to shops of the Huron Portand Cement Company. The Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was producing cement by 1907. By ... -
Huron Portland Cement Company, squaring shears
Screen guards on squaring shears are shown at a machine shop of the Huron Portland Cement Company. The Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was producing cement by 1907. By 1910 ... -
Huron Portland Cement Company, electric locks on main switches
The Company began operations on the north shore of Thunder Bay, Michigan in 1901 and was producing cement by 1907. By 1910 it had become the largest cement producer in the world, using limestone quarries around Alpena and ...
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