Showing papers on "Watermark published in 1986"
Patent•
20 May 1986
TL;DR: In this article, a method of applying a pseudo watermark to paper is described, which comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change.
Abstract: A method of applying a "pseudo watermark" to paper, comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent. Apparatus suitable for applying heat to the paper is also disclosed.
27 citations
TL;DR: Heawood as mentioned in this paper was drawn to the subject by Charles MoTse Briquet's work Les Filigranes,1 first published in 1907 and reprinted in 1923, and subsequently paid much attention to the watermarks appearing in the paper on which Saxton's maps were printed.
Abstract: Edward Heawood (1863-1949), the undisputed British doyen of filigranology, was drawn to the subject by Charles MoTse Briquet's work Les Filigranes,1 first published in 1907 and reprinted in 1923. The value of a comparative study of watermarks was brought home to Heawood when he was able to show that a copy of Chris topher Saxton's county map of Durham, sub mitted to him for his opinion, was not an early issue. He subsequently paid much attention to the watermarks appearing in the paper on which Saxton's maps were printed. Among these were two that he later illustrated in his