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Equisetum arvense. (a) Sterile shoot. (b) Fertile shoot growing from an underground rootstock. (c) Cone. (d) Two views of shield-shaped sporangiophores. (e) Spores, greatly enlarged. As spore dries, elaters expand. (After E. W. Sinnott and K. S.…

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from article Equisetales

Equisetum gametophyte. (a) Small gametophyte, showing antheridia only. (b) Male gametes. (c) Larger gametophyte; branching lobes have archegonia at bases. (After E. W. Sinnott and K. S. Wilson, Botany: Principles and Problems, 6th ed., McGraw-Hill,…

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from article Equisetales

Sporophytes. (a) Equisetum gametophyte with sporophytes. (b, c, d) The young sporophytes of Equisetum hiemale. (After G. M. Smith, Cryptogamic Botany, vol. 2, 2d ed., McGraw-Hill, 1955)

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from article Electric power generation

Coal-fired electric power plant. (Credit: mrclark321/Getty Images)

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from article Electric power generation

Steam power plant flow diagram.

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from article Electric power generation

Gas turbine plant flow diagram.

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from article Electric power generation

Cross section of a hydroelectric powerhouse. Arrangement is typical for an adjustable propeller-type reaction turbine. The intake and powerhouse are integral; waterways consist of intake, scroll case, and draft tube. Turbine and generator are set…

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from article Dewar flask

Two typical Dewar containers.

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from article Solution mining

Solution mining of a subsurface evaporite deposit. Mining is normally initiated at the bottom of the deposit and retreats vertically, leaving a mined-out cavity. Saturated brine is heavier (denser), and is recovered from the bottom of the cavity.…

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from article Solution mining