noun
dry plate (photography)
Historical photographic term; a glass plate coated with a light-sensitive emulsion, used before film. Now mainly encountered in historical or technical contexts.
See also: 乾板
19世紀の写真家は写真乾板を使って風景を撮影した。
19th-century photographers used dry plates to capture landscapes.
乾板 is a shorter synonym for dry plate; 写真乾板 explicitly includes 'photographic' for clarity.
Compound of 写真 (photograph) and 乾板 (dry plate). The term reflects early photographic technology.