coal pipe
21building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
22Hookah — Qalyan redirects here. For the village in Iran, see Qolian, Lorestan. The homophone hooka can refer to surface supplied underwater diving. An Egyptian hookah (shisha). A hookah(Gujarati હૂકાહ) (Hindustani: हुक़्क़ा (Devanagari …
23Mohave Power Station — Mohave Generating Station …
24Newcomen steam engine — Animation of a schematic Newcomen steam engine. – Steam is shown pink and water is blue. – Valves move from open (green) to closed (red) The atmospheric engine invented by Thomas Newcomen in 1712, today referred to as a Newcomen steam engine (or… …
25Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …
26tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
27Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
28Bahnbetriebswerk (steam locomotives) — A Bahnbetriebswerk (also abbreviated to Betriebswerk, Bw or BW) is the German term for a depot where the maintenance of railway locomotives and other rolling stock is carried out. It is roughly equivalent to a locomotive shed, running shed or… …
29Steam locomotive — A steam locomotive is a locomotive powered by steam. The term usually refers to its use on railways, but can also refer to a road locomotive such as a traction engine or steamroller.Steam locomotives dominated rail traction from the mid 19th… …
30Carbon — (), but as most compounds with multiple single bonded oxygens on a single carbon it is unstable.] Cyanide (CN–), has a similar structure, but behaves much like a halide ion (pseudohalogen). For example it can form the nitride cyanogen molecule… …
