| Year | 1933 |
| Date | 02-Feb |
| Volume | 68 |
| Issue | 1,656 |
| Page | 105 |
| Category | Steam |
| Part | |
| Title | Some Points in Altering Slide Valve Motion |
| Author | Geo. Gentry |
| Notes | The sketches described, effect of using lead, how to produce an early cut-off, a rule for producing a given cut-off, how to vary the proportions to produce cut-off at half, reduction of valve travel and steam opening, the proposed valve proportions, the effect of the particular valve motion, correcting the slot motion to cut off practically exactly at half, a few practical hints |