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Figure 5. Bour, Cours de Mécanique et Machines, Figure 6. Adam Jerzy Czartoryski 1860.
1865.

Dulos produced a great variety of engravings including not only illustrations of light
spectra and chemical equipment, but also images from “architecture, portraiture, the
decorative arts, and even commercial advertising.”24 See Figures 5 and 6 for examples.
He also engraved topographic maps for the French Ministry of War and the Harbour
Commission.25 In recognition for that work he was made a Chevalier de la Légion
d’Honneur in 1867.26 Dulos was, Hentschel tells us, “one of the most highly skilled
technical engravers of his time.”27

However, Dulos was not just a technician; he also was a chemist and inventor and
he enjoyed great success from the engraving process that he invented and patented.
Indeed his process is known as the “Procédé Dulos” or “Dulos Process,” and also as
“capilligraphie,” a term derived from the capillary action on which his invention
is based.28 He was also awarded a gold medal by the Société d’Encouragement pour
l’Industrie Nationale for his engravings and invention.29

In his later years Dulos employed many workers to enable him to keep up with his
growing commissions.33 Dulos died in Paris on April 15, 1874 at age fifty-three.31 One
wonders whether Dulos’ extensive use of mercury may have contributed to his early
death.

Hentschel’s article was based primarily on archival sources, notably the inventory
of Dulos’ estate, his marriage contract and civil and church records, as well as the
books and journals containing his engravings. Since the work is based on primary
sources, including numerous signed engravings, we may confidently accept that his
last name was indeed spelled with an “s” – Dulos – and not Duloz as he is known in
the Turkish philatelic world. Hentschel also twice spelled one of his given names
“Edelestand,” with a final “d” not present in the printed version of his English patent.32
Again, we may take that as accurate.

I am not entirely sure where the Duloz spelling came from. The earliest philatelic
reference to the stamp, from which I have obtained information, is the aforementioned

102 March–April 2015 Collectors Club Philatelist Vol. 94 No. 2