An alternative spelling or variant of aphengescope; an optical instrument for studying absence of light.
From the same Greek roots as aphengescope (a- + phengos + -scope), but with a variant spelling that may reflect different phonetic or linguistic preferences in different regions or time periods.
Scientific instruments often have multiple spellings from different countries or eras—this is a reminder that even 'official' science wasn't always perfectly standardized across Europe and America.
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