WW1 British Heliograph Mirror 5″ Mk 5 T.B.S. In Leather Case

The WW1 British Heliograph Mirror 5″ Mk 5 T.B.S. is a signaling device developed for military communication. Heliographs were widely used by British forces during the First World War to transmit coded messages using flashes of sunlight reflected by a mirror. This model features a 5-inch diameter signaling mirror, marked as Mk 5 T.B.S., a designation indicating its specific variant within British military equipment standards of the era. The apparatus is constructed with a robust glass mirror, precision-fitted into a metal frame for durability and accuracy in the field. The mirror and associated signaling components are stored in a fitted leather case, designed to protect the instrument while allowing for rapid deployment. Associated parts, which may include the sighting mechanism and tripod attachment, are typically stored within the case. Original WW1 examples such as this were assigned to field units, offering reliable line-of-sight communication over long distances when other forms of communication were unavailable.