N & CO. ELECTRICITY &8?iirAx” ing matter on request. spark. | NOVELTIES : H Optical and Scientific Instru- Rockford, Ill. B. F. BARNES COMPANY, ny | How to Make a Dynamo; How to Make a Storage Bat- x ment Works, (8450) F. S. writes: 1. A friend of | tery; How to Make a Voltmeter. Ten cents each.… … There is electricity always present in the at- 12 Huron Street, mosphere, which can be detected by the proper instruments, but which is seen by any one in thunderstorms. This electricity is, however, You can for Steam, Air or Liquids. not used for any practical purpose. 2. I have Made in all sizes…
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