SCIENTIFIC AMERICAN, New York, April 15, 1911.

* Niagara's Bridal Veil Falls
* Evaluating Coal

This issue contains the following prints, articles and ads: "Illumination of Bridal Veil Falls of Niagara", "Light and Shadows - Ministering to Eye Comfort by Modern Methods", "Good Coal and Poor", "Heating the Home", "Lamps of Today", "Light and Power on the Farm", and "Inventing the Light of the Future". This issue is in nice condition.