Solar Heat - Its Practical Applications $19.95

SUNLIGHT is a common word, its meaning nearly universally appreciated. The heat of the sun can be concentrated just as well as its light. However, the word "sunheat" is clearly not as fully under­stood. Every ray of illumination which comes to us from the sun is entwined with a ray of caloric, equally strong and equally beneficial. A pocket magnifying-glass, one inch and an eighth in diameter, concentrates enough heat to set paper on fire in a tiny spot in a second or more. The larger the lens, the broader the spot or section which flames up and burns out the paper in the same time. A glass three inches wide sets wood afire; one six inches across can bore a hole through a shingle; one of eight inches diameter burns very hard wood, and inflames a disc the size of a dollar on paper. Charles H. Pope new the power of solar heat intimately. He wrote this book in the hopes that it would serve as the foundation that those who read it to would need in order to be successful at “catching the sunbeams and extracting gold from them.”  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Solar Heat - Its Practical Applications $19.95

SUNLIGHT is a common word, its meaning nearly universally appreciated. The heat of the sun can be concentrated just as well as its light. However, the word "sunheat" is clearly not as fully under­stood. Every ray of illumination which comes to us from the sun is entwined with a ray of caloric, equally strong and equally beneficial. A pocket magnifying-glass, one inch and an eighth in diameter, concentrates enough heat to set paper on fire in a tiny spot in a second or more. The larger the lens, the broader the spot or section which flames up and burns out the paper in the same time. A glass three inches wide sets wood afire; one six inches across can bore a hole through a shingle; one of eight inches diameter burns very hard wood, and inflames a disc the size of a dollar on paper. Charles H. Pope new the power of solar heat intimately. He wrote this book in the hopes that it would serve as the foundation that those who read it to would need in order to be successful at “catching the sunbeams and extracting gold from them.”