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Ueber sein am ein und zwanzigsten Decembr. 1784. angekündigtes Problem einer Korrespondentz in ab=und unabsehbaren Weiten der Kriegsvorfälle oder über Synthematographik mit Kupfern in Schreiben an ...den Prinzen Ferdinand Herzogen zu Braunschweig und ...
Hanau, (no printer), 1785-86. Bound in one fine cont. hcalf, raised bands and richly gilt back. A stamp on first titlepage and an old owner name. (1),134(1),118"(4),144 pp. and 10 folded engraved plates. On good paper, clean and fine.
First edition. Bergsträsser invented this form of signalling, which he called ""Synthematographik"", an optic telegraphy based on a binary code. The system is well illustrated in the 10 plates. - Rosenthal p. 372. - Poggendorff I: p. 152.
