| Year | 1929 |
| Date | 13-Jun |
| Volume | 60 |
| Issue | 1,466 |
| Page | 558 |
| Category | Internal Combustion |
| Part | |
| Title | Indicators for Small Internal Combustion Engines |
| Author | Edgar T.Westbury |
| Notes | Crosby indicator with external spring, fitted with extension bridge and rubber buffer, typical daigrams taken from Ruston-Hornsby petrol engine, DeJuhasz indicator and valve element, Okill indicator |