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A harvesting machine removing selected trees in a thinning operation designed to enhance the growth of the trees that remain after the operation. The “processing head” is holding a horizontal tree stem that is being delimbed and processed into logs…

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from article Forest engineering

A well-engineered forest road and timber bridge in the Tongass National Forest in southeast Alaska. The bridge, designed to support heavy logging trucks, was used rather than a culvert to reduce erosion and protect water quality. (Photograph…

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from article Kiln

Rotary kilns: (a) single-diameter; (b) two-diameter. (After R. H. Perry and C. H. Chilton, Chemical Engineers' Handbook, 5th ed., McGraw-Hill, 1973)

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from article Kiln

Vertical shaft kiln. (After C. J. Lewis and B. B. Crocker, The lime industry's problem of airborne dust, J. APCA, 19:31–39, 1969)

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from article Kiln

Interior of periodic kiln, with electrical porcelain insulators for firing. (Swindell-Dressler, Inc.)

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from article Kiln

Section of direct-fired tunnel kiln showing principle of operation. (After T. J. W. van Thoor, ed., Chemical Technology: An Encyclopedic Treatment, vol. 2, Barnes and Noble, 1971)

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from article Crushing and pulverizing