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<!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Scientific American Supplements Volume 9, Issue 216supp | Scientific American</title> <link rel="canonical" href="https://www.scientificamerican.com/issue/supplements/1880/02-21/"> <meta name="theme-color" content="#fff"/> <meta name="robots" content="max-image-preview:standard"/> <link rel="image_src" src="https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif"> <meta property="og:url" content="https://www.scientificamerican.com/issue/supplements/1880/02-21/"/> <meta property="og:image" content="https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif?w=1200"/> <meta name="twitter:image" content="https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif?w=1200"/> <meta name="description" content=""The Thunderer Gun Experiments", "Final Bursting of the Second Gun", "The Construction of Canvas Canoes" and more"/> <meta property="og:description" content=""The Thunderer Gun Experiments", "Final Bursting of the Second Gun", "The Construction of Canvas Canoes" and more"/> <meta property="og:type" content="website"/> <meta name="twitter:title" content="Scientific American Supplements Volume 9, Issue 216supp"/> <meta name="twitter:description" content=""The Thunderer Gun Experiments", "Final Bursting of the Second Gun", "The Construction of Canvas Canoes" and more"/> <meta property="og:site_name" content="Scientific American"/> <meta property="og:locale" content="en_US"/> <meta name="twitter:site" content="@sciam"/> <meta name="twitter:domain" content="scientificamerican.com"/> <meta name="twitter:card" content="summary_large_image"/> <script type="application/ld+json">{"@context":"https://schema.org","@graph":[{"@type":"PublicationIssue","@id":"https://www.scientificamerican.com/issue/supplements/1880/02-21/","datePublished":"1880-02-21","description":"Scientific American Supplements Volume 9, Issue 216supp","hasPart":[{"@type":"Article","about":"","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"The Thunderer Gun Experiments","image":null},{"@type":"Article","about":"","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"Final Bursting of the Second Gun","image":null},{"@type":"Article","about":"","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"The Construction of Canvas Canoes","image":null},{"@type":"Article","about":"","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"The Tay Bridge","image":null},{"@type":"Article","about":"Code of Regulations for the Test Trials of Automatic Cut-Off Steam Engines, at the Millers' International Exhibition, Cincinn Ati, June, 1880","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"The Millers' International Exhibition","image":null},{"@type":"Article","about":"","author":[],"datePublished":"1880-02-21T05:00:00-05:00","headline":"Porosity of Cast Iron","image":null},{"@type":"Article","about":"","author":[{"@type":"Person","name":"George S. 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srcSet="https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif?w=400 400w, https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif?w=600 600w, https://static.scientificamerican.com/sciam/cache/file/F03225A9-3CA4-457F-854318D48FFEA8DC_source.gif?w=900 900w" sizes="300px" width="300"/></div><div class="issue__detail__info-PytSq"><div class="issue__detail__meta-cIUoE"><h1>SA Supplements</h1></div><div class="issue__heading-gBfnb"><h2><time dateTime="1880-02-21">February 1880</time></h2></div><small><span>Volume 9</span>, <span>Issue 216supp</span></small><div class="download__access-pNuvp"><p>You are currently logged out. Please sign in to download the issue PDF.</p><button class="button-Nws5y button__primary-WTBGh">Sign In</button></div><div class="issueArchiveArticleList-p9KXT"><div class="issueArchiveArticleList-p9KXT"><h2 class="listHeading-TIGph">Features</h2><article class="article-4xs14"><h4 class="articleTitle-e093r">The Thunderer Gun Experiments</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Final Bursting of the Second Gun</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">The Construction of Canvas Canoes</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">The Tay Bridge</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">The Millers' International Exhibition</h4><section><div class="dek-5E7-A"><p>Code of Regulations for the Test Trials of Automatic Cut-Off Steam Engines, at the Millers' International Exhibition, Cincinn Ati, June, 1880</p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Porosity of Cast Iron</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Comparative Values of Gas and Coal鈥擳he Fuel of the Future鈥擟urious Speculations about the Wastes of Coal</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">George S. Dw Ght</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Rapid Steam Communication with Australia</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">On the Heating Power of Coal Gas</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">Wm. Wallace</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Wood Paving</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Separation of Fats and Soaps</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">Justus Wolff</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Photographing Colors</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">New Coloring Matters</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">P. 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