Physical description
Two 120 VAC lighthouse lamp changers, 6 globes on each ex Point Lonsdale Lighthouse and new control unit mechanism
Inscriptions & markings
LC-300 120 VAC amp changer Part No. 630.1087 Series A Max voltage 130 Lamp size 250Watts US and foreign patents Tideland Signal Ltd, Surrey, England. Identifier No 1: 189486-5/01 Tideland Signal Corp, Houston, Texas USA identifier
Subjects
References
- Automatic light changer An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist. The common design elements are an array of two or more lamps (or bulbs), installed on a mounting which can rotate to various positions. Each position brings a different lamp into the focal point of an optical assembly. Since signal and navigational lights use sophisticated optics to focus the beam, lampchangers are designed to position the new bulb at the focal point with high precision. The device automatically detects when the currently active lamp has ceased to function and moves the next lamp into place.
