References
Chart showing the number of references in each month of the diary’s entries.
1668
- Mar
Lenses
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Daily entries from the 17th century London diary
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Chart showing the number of references in each month of the diary’s entries.
1 Annotation
Second Reading
Terry Foreman • Link
A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. https://en.wikipedia.org/wiki/Bur…