Subject ASC0003j41
Journal of the Royal Microscopical Society.
ser.2:v.1:pt.1:no.1-3 (1881), Page 344 (1878-1968.)
New York Botanical Garden, LuEsther T. Mertz Library
BHL Page 31227495
Keywords
technology electricity physic photometric angles glass apparatus light direct rays observer angular aperturist plate illuminate