| Year | 1920 |
| Date | 12-Feb |
| Volume | 42 |
| Issue | 981 |
| Page | 159 |
| Category | General |
| Part | |
| Title | Mechanical Road Traction |
| Author | C.G.Conradi |
| Notes | Tipping Lorries. Characteristics of motor-vehicles, steam, petrol, electric, comparison of the three systems, petrol-engine tractors, Constable lorry, Yorkshire 6-ton steam lorry, Conrad tipping body, Wilkin's unloading gear, Hardaker jacktruck, water-tube boiler (Sentinel), steam & petrol tractors (Foster) |