Robert Wilhelm Bunsen worked in Hesse in 1839-41.
1841 carbon cost £ 0.051 (~1s.)
Where the écu is the Thaler in Hesse-Cassel, weighing 22.13 Grams at .748 Fine Ag, "2 écu" = 33.103 Grams Fine Ag (~ USD$ 1.376); "18 écu" = 297.94 Grams Fine Ag (~ USD$ 12.384)
Where the écu is a Speciesthaler, or 1.33 Thaler Courant, weighing 23.377 Grams Fine Ag, "2 écu" = 46.754 Grams Fine Ag; "18 écu" = 420.786 Grams Fine Ag.
Check Poggendorf.
Citation: The Electrical Magazine, Vol. 1; Charles Vincent Walker (1843)
Possibly dated, reference to the Nußdorf works (1819)
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