Erygmascope
An erygmascope is a late 19th-century electric lighting apparatus designed for the examination of the strata of earth traversed by boring apparatus. It consisted of a very powerful incandescent lamp enclosed in a metallic cylinder.
An erygmascope is a late 19th-century electric lighting apparatus designed for the examination of the strata of earth traversed by boring apparatus. It consisted of a very powerful incandescent lamp enclosed in a metallic cylinder.
An erygmascope is a late 19th-century electric lighting apparatus designed for the examination of the strata of earth traversed by boring apparatus. It consisted of a very powerful incandescent lamp enclosed in a metallic cylinder.
Source: Wikipedia "Erygmascope" · CC BY-SA 4.0
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