Extension of the Spectrum beyond the Schumann Region—I
Difficulties Encountered and Methods of Procedure Followed

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Difficulties Encountered and Methods of Procedure Followed
Some Results of Experiments with Various Kinds of Ray Filters
A Short History of Its Progress, and the Various Schools of Art
Interesting Designs That Have Been Successfully Erected
Primitive Methods, Some of Which are Still in Use
Methods of Determining Efficiency of Combustion
Notes on a Great Batracian Little Known in this Country
Experiments Made to Ascertain How the Insect Produces Light
Methods Used In Welding Cast Iron, Wrought Iron, Steel, Brass, Bronze and Aluminum