practical and durable inventions. They amuse and instruct. They point many a boy to a useful career. Equipped with dry batteries no acids or liquids used perfectly safe and harmless. ILLUSTRATED BOOKLtT SENT FREE THE CARLISLE ra FINCH COMPANY Largest Manufacturer s Electrical NovelUes In the World, scientific american, 1907-11-16

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practical and durable inventions. They amuse and instruct. They point many a boy to a useful career. Equipped with dry batteries no acids or liquids used perfectly safe and harmless. ILLUSTRATED BOOKLtT SENT FREE THE CARLISLE ra FINCH COMPANY Largest Manufacturer s Electrical NovelUes In the World, scientific american, 1907-11-16

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