| Year | 1912 |
| Date | 11-Jul |
| Volume | 27 |
| Issue | 585 |
| Page | 33 |
| Category | Nautical |
| Part | |
| Title | Notes on Buoys, Lights and Beacons |
| Author | C.Blazdell |
| Notes | Beacons marking a measured mile for ship's speed trials, lighthouse beacon plan showing how lighthouse & beacon form leading marks to clear shoal, beacon referred to in plan, lighthouse referred to, beacon indicating edge of submerged mud bank, plan showing application of beacon, photo of unwatched gas beacon marking the course of a river, plan showing application of unwatched gas beacons, lighthouse for channel indication, use of white light with coloured sectors, light vessel |