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<!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Scientific American Volume 91, Issue 6 | Scientific American</title> <link rel="canonical" href="https://www.scientificamerican.com/issue/sa/1904/08-06/"> <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/BD3B2A46-177C-4FA3-869B2C66E78BA5AE_source.jpg"> <meta property="og:url" content="https://www.scientificamerican.com/issue/sa/1904/08-06/"/> <meta property="og:image" content="https://static.scientificamerican.com/sciam/cache/file/BD3B2A46-177C-4FA3-869B2C66E78BA5AE_source.jpg?w=1200"/> <meta name="twitter:image" content="https://static.scientificamerican.com/sciam/cache/file/BD3B2A46-177C-4FA3-869B2C66E78BA5AE_source.jpg?w=1200"/> <meta name="description" content=""Tropical Specialties for Porto Rico", "Osmon, a New Combustible from Peat", "M. 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400w, https://static.scientificamerican.com/sciam/cache/file/BD3B2A46-177C-4FA3-869B2C66E78BA5AE_source.jpg?w=600 600w, https://static.scientificamerican.com/sciam/cache/file/BD3B2A46-177C-4FA3-869B2C66E78BA5AE_source.jpg?w=900 900w" sizes="300px" width="300"/></div><div class="issue__detail__info-PytSq"><div class="issue__detail__meta-cIUoE"><h1>Scientific American Magazine</h1></div><div class="issue__heading-gBfnb"><h2><time dateTime="1904-08-06">August 1904</time></h2></div><small><span>Volume 91</span>, <span>Issue 6</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">Tropical Specialties for Porto Rico</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">Osmon, a New Combustible from Peat</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">M. Curie's Experiments with Radium Emanations</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 Exposition as an Educational Force</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 Influence of Milking upon the Quantity and Quality of Milk</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">Phosphorescent Crystallization of Arsenious Acid</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">A. C. Maury</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">The Locomotive-Testing Plant at the World's Fair</h4><section><div class="dek-5E7-A"><p>The St. Louis Correspondent of the <i>Scientific American</i></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Counterweighted Cable Tramway</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">John Plummer</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">A Novel Wave Meter for Wireless Telegraphy</h4><section><div class="dek-5E7-A"><p>By Our Berlin Correspondent</p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">A Handless Clock</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">Aeroplane Experiments</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">Major B. Baden-Powell</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Trained Animals at the World's Fair</h4><section><div class="dek-5E7-A"><p>By the St. Louis Correspondent of the <i>Scientific American</i></p></div><p class="authors-G71Hd"></p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">The Bee as an Artisan</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">Transportation Old and New</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd">R. E. Chambers</p></section></article><article class="article-4xs14"><h4 class="articleTitle-e093r">Business and Personal Wants</h4><section><div class="dek-5E7-A"><p></p></div><p class="authors-G71Hd"></p></section></article></div><div class="issueArchiveArticleList-p9KXT"><h2 class="listHeading-TIGph">Departments</h2><article class="article-4xs14"><h2 class="departmentsArticleTitle-4XlrA">Correspondence - August 6, 1904</h2></article><article class="article-4xs14"><h2 class="departmentsArticleTitle-4XlrA">Notes and Queries - August 6, 1904</h2></article><article class="article-4xs14"><h2 class="departmentsArticleTitle-4XlrA">Recently Patented Inventions - August 6, 1904</h2></article><article class="article-4xs14"><h2 class="departmentsArticleTitle-4XlrA">Index of Inventions - August 6, 1904</h2></article><article class="article-4xs14"><h2 class="departmentsArticleTitle-4XlrA">Patents - August 6, 1904</h2></article></div></div></div></div></div></div></main><footer 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