Other

Crosfield Electronics Limited

Peter J Wood

Peter C Pugsley

John Albery

Wave power converter

An autotitration method for electrochemically determining the concentration of a substance (S) contained in a fluid, which is arranged to flow past a generator electrode (2) and downstream thereof a detector electrode (3), said substance being capable of reacting with a species which is generated electrochemically at the generator electrode, the non-reacted portion of said species being detected electrochemically at the detector electrode. According to the invention the generator electrode current (i.sub.gen.) is controlled in response to the ratio between the detector electrode current (i.sub.det.) and the generator electrode current so as to maintain said ratio (i.sub.det. /i.sub.gen. or i.sub.gen. /i.sub.det.) at a pre-determined value (N'). Either of said currents (i.sub.gen. or i.sub.det.), which is a function of the concentration of the substance to be determined, is then measured. The invention further discloses a device for carrying out this autotitration method.

Method and an apparatus for electrochemical analysis

To produce a whole page image from a number of separate images, the input images are separately scanned and reproduced at the required enlargement or reduction to produce pre-prints which are then assembled on a digitizer table in the relative positions required for the finished page; signals representing the boundaries of these positions are generated and stored; the boundary representing signals then control the derivation of output signals suitable for a scanner making the whole-page reproduction, each whole-page line signal including the line signals for each of the input images crossed by the page line, the output signals controlling the treatment of a sheet or surface for use in the preparation of a printed page.

Printing methods for producing prints having images of variable size and

In a method of image reproduction in which both pictures and test are to be combined in an image on a single sheet for use in the reproduction of a printed page, and in which the signals resulting from the scanning of the pictures are stored prior to the preparation of the sheet, a high resolution is achieved in the reproduction of the text without requiring excessive storage capacity for the picture signals by scanning the text at a resolution which is an integral multiple n of the picture resolution and, when the text and picture signals are merged to control an output scanner operating at the higher resolution, applying each line of picture signals extracted from store n successive times to the output scanner.

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Potters Bar, United Kingdom

Peter J Wood