| Year | 1918 |
| Date | 17-Oct |
| Volume | 39 |
| Issue | 912 |
| Page | 219 |
| Category | General |
| Part | |
| Title | Engineering and Invention Notes |
| Author | |
| Notes | Advantages of Electrical Brass Melting. Economical High-speed Tools. An Electromagnet with Multiple Concentric Poles. Swiss Water Power. A Shortage of Tungsten. Warming the Electrolyte of a Storage Cell |