Images: Recent submissions
Now showing items 1-20 of 5046
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Fixed grip carrier #103 at Steamboat Springs, ColoradoSteamboat load test accident; see article Danger-Load Test in Progress (Ski Area Management) by Charles F. Dwyer.
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Thinly bedded structure of immediate roofThe thinly bedded structure of a sedimentary rock is shown underground at an unidentified mine.
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Roof bolts and channels supporting high roofThree men stand in a tunnel with a high roof underground at an unidentified mine.
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Bolted roof in haulage-wayThe image shows roof bolts in a haulage way with two men in a trolley, underground in a coal mine.
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Roof and ribs at intersection secured with roof boltsRoof bolts are shown on the roof of an intersection underground at an unidentified mine.
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Vertically installed roof bolts at working faceTwo miners stand at a working face of what may be a coal mine. One miner points to the roof bolts.
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General view of fall of bolted roofRock debris with detached bolts from a rock fall is shown in an unidentified underground mine.
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Cutting machine in travel-wayTwo miners ride a cutting machine in a travel-way underground. The image shows close views of roof bolts.
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Drilling first of four holes for anchor boltsThree miners are shown drilling holes for anchor bolts underground at an unidentified mine.
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Drilling hole for anchor bolt at end of channelThree miners are shown drilling holes for anchor bolts underground at an unidentified mine.
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Huron Portland Cement Company, coupling and gear-reduction guards on screw conveyorsThe 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 quarries around Alpena and Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued operations in Alpena.
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Huron Portland Cement Company, electric locks on main switchesThe 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 Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued operations in Alpena.
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Warning sign, Huron Portland Cement Company shopA 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 1910 it had become the largest cement producer in the world, using limestone quarries around Alpena and Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued operations in Alpena.
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Key boxHuron 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 quarries around Alpena and Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued operations in Alpena.
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Huron Portland Cement Company, squaring shearsScreen 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 it had become the largest cement producer in the world, using limestone quarries around Alpena and Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued operations in Alpena.
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Huron Portland Cement Company, canopy-type hoods over grinding wheelsHoods 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 producing cement by 1907. By 1910 it had become the largest cement producer in the world, using limestone quarries around Alpena and Rogers City. The Company was purchased by the Lafarge Corporation in 1986 and continued to operate in Alpena.
