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He learned the difference between a latent print — which is transferred with sweat and often needs to be dusted or processed with chemical agents in order to be detected — and a visible print, which is either impressed in a substance or left by touching a surface with something on one's fingertips, such as ink.
The Oliver Typewriter was the first effective "visible print" typewriter, meaning text was visible to the typist as it was entered.
Unlike the "up strike" method, which prints text out of sight on the underside of the platen, the "down strike" is a "visible print" design, meaning the full page is visible to the typist as the text is being entered.
Although the machine possessed a cylindrical platen and what was essentially a QWERTY keyboard, two design elements that would later become essential were lacking: the ability to write in upper and lowercase letters and "visible" print.
The "front strike" method, a competing "visible print" design, was patented around the same time (1889 91), but an effective machine that did not interfere with the typist's line of sight was not available until 1897 when, roughly three years after the introduction of the Oliver No. 1, the Underwood No. 1 appeared on the market.
The initial setting time was defined as the time necessary for the light needle (228.6 g, Ø 5.067 mm) to plunge into the paste no longer leaving a visible print on the surface of the paste, while the final setting time was defined as the time necessary for the heavy needle (306 g, Ø 1.140 mm) to no longer leave a visible print on the surface of the paste.
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Visible prints may be left behind by substances that stick to the fingers such as dirt or blood or they may take the form of an impression made in a soft substance, such as clay.
StudioCanal was highly visible with print and online advertising last week, trumpeting strong critical endorsement.
A drop of Superglue is put into the chamber in a small tin dish and heated; the heat releases fumes of the glue's active ingredient, cyanoacrylate, which adheres to the moisture secreted by fingertips, creating a visible white print.
Card makers sought to render these less visible by printing a pattern of fine dots or a tartan design (described as taroté in French) on the backs of cards.
Before finalizing, take a sample to your printer and see if all the text and elements will be visible after printing.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com