Lamp testing. Electrical equipment being used to test various different types of light bulbs. These tests ensured that public buildings had the most economical and efficiently maintained light sources possible. Photographed at the National Physical Laboratory,Teddington,UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NATIONAL PHYSICAL LABORATORY (c) CROWN COPYRIGHT |
Bildgröße: | 4447 px × 4134 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |