| Year | 1949 |
| Date | 05-May |
| Volume | 100 |
| Issue | 2,502 |
| Page | 548 |
| Category | In The Workshop |
| Part | 36 |
| Title | Additions to Machine Tools. (4) Attachments for increasing the speed range of the drilling machine |
| Author | "Duplex" |
| Notes | The "Champion" drilling machine, construction of the attachment, the intermediate pulley mounting, machining the v-pulley, the mounting for the driving and jockey pulleys, adjustable tension device for the return spring, constructional work |