The Stencil Subtractor frame was a ciphered text recyphering tool that was invented by British Army Intelligence Officer and cryptographer John Tiltman[1] and was ready for trial by April 1941 but was not adopted officially by the British Forces until March 1942, and not brought into service until June 1943.[2] It was used together with Subtractor tables, placed on top of the table and the numerical values visible in the gaps of the SS Frame were used to encipher the underlying numerical code, for example the War Office Cipher, RAF cipher or Naval cipher. The SSF was described as follows:
"consisting of a plastic grille that contained 100 4-digit wide windows randomly spaced. This was superimposed over an additive sheet that had forty-eight lines of sixty-eight digits each. Setting squares on the grille provided placement for one-hundred possible settings and a conversion table appeared on each sheet with mixed sequences of digits from 00 to 99 for indicating purposes. The placement of the grille was determined through a substitution pattern sent to each user"[3]
^Christopher H. Sterling (2008). Military Communications: From Ancient Times to the 21st Century. ABC-CLIO. p. 453. ISBN 978-1-85109-732-6.
^John Ferris (7 May 2007). Intelligence and Strategy: Selected Essays. Routledge. p. 159. ISBN 978-1-134-23335-9.
^Liberty, Harold (20 July 2022). The Forgotten Giant of Bletchley Park. Yorkshire: Pen and Sword Military. p. 213. ISBN 978-1-3990-8964-7.
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The StencilSubtractor frame was a ciphered text recyphering tool that was invented by British Army Intelligence Officer and cryptographer John Tiltman...
recorded and reproduced rather than artificially added by hand-painting, stencil coloring, or other arbitrary "colorization" methods. Process: the name...
repeated for each set of stencils corresponding to a different color. By 1910, Pathé had over 400 women employed as stencilers in their Vincennes factory...
most often starts with a stencil created by the artist. Stencils are made of plastic, steel, aluminum, and/or wood. Stencil designs can be laser cut or...
surface, effectively making the print into a plate, is called a "cognate". Stencils, watercolor, solvents, brushes, and other tools are often used to embellish...
Porous or Stencil, in which the printing areas are on fine mesh screens through which ink can penetrate, and the non-printing areas are a stencil over the...
Planographic techniques include lithography, monotyping, and digital techniques. Stencil, where ink or paint is pressed through a prepared screen or material with...
which continued to be coloured by stencil long after most other subjects for prints were left in black and white. Stencils were used for mass publications...
is etched away. Thick film resistors are manufactured using screen and stencil printing processes. Because the time during which the sputtering is performed...
technique, 3D nanostructures can be printed by physically moving a dynamic stencil mask during the material deposition process, somewhat analogous to the...
– Johann Heinrich Schulze makes fleeting sun prints of words by using stencils, sunlight, and a bottled mixture of chalk and silver nitrate in nitric...
components, through-hole reflow, when achievable by specifically modified paste stencils, may allow for the wave soldering step to be eliminated from the assembly...
typically not something that preserves archaeologically, some prehistoric hand stencils have been interpreted as finger-counting since of the 32 possible patterns...
of the Kimberley region, which is potentially up to 50,000 years old. Stencils and paintings of boomerangs also appear in the rock art of West Papua,...
difference approximations for non-standard (and even non-integer) stencils given an arbitrary stencil and a desired derivative order may be constructed. For all...
backgrounds. A significant innovation planned for the film was the use of stencil printing for the transition to Technicolor. Each frame was to be hand-tinted...
grab it for security. Some riders also place quarter marks (decorative stenciling) on the hindquarters. Most event riders have a jumping saddle as well...
placed it in direct sunlight for a while, he applied stencils of words to the bottle. The stencils produced copies of the text in dark red, almost violet...
twentieth century, duplicating machines such as the mimeograph and Gestetner stencil devices were used to produce short copy runs (typically 10–50 copies) for...
that socialism is seriously discredited. It survives as "a mobilizing stencil for grievances... and to love as a ‘totalitarian political movement.’"(p195)...
is etched away. Thick film resistors are manufactured using screen and stencil printing processes. Because the time during which the sputtering is performed...
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