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<p>the <a href="page.php?w=petroleum_industry">petroleum industry</a> arose.</p>

<p><a href="page.php?w=Gas_lighting">Gas lighting</a> was economical enough to power street lights in major cities starting in the early 1800s, and was also used in some commercial buildings and in the homes of wealthy people. The <a href="page.php?w=gas_mantle">gas mantle</a> boosted the luminosity of utility lighting and of kerosene lanterns. The next major drop in price came about in the 1880s with the introduction of <a href="page.php?w=electricity">electric lighting</a></p><p>
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