| Year | 1919 |
| Date | 07-Aug |
| Volume | 41 |
| Issue | 954 |
| Page | 137 |
| Category | Electrical |
| Part | |
| Title | Modern High Speed Influence Machines |
| Author | V.E.Johnson |
| Notes | Introduction, what text-books tell us, all-important part played by air, Holtz, Wimshurst and Bonetti machines, Bonetti machine, position of neutralising rods & collecting combs, Wimshurst machine of the simple type, factors on which quantity depends, comparison of various machines, how the output can be increased, disc arrangement, Pidgeon influence machine, output of three types of machine, spark discharge, first foot-driven machine by the author |