| Rhif Cyf Amg | PFA/6/310 |
| Teitl | Plan of proposed turbines together with dynamos at Penlan Mill to light Penrhyn Castle and of the proposed line of pipes to supply water to turbines at Llandegai, Bangor |
| Disgrifiad | Tracing paper, various scales. |
| Dyddiad | Late 19th - Early 20th century |