The engine was the first developed with a full authority analogue computer, de Havilland's own, as part of the fuel control system, specifically to anticipate helicopter power demand from pilot control inputs and to limit fuel flow during acceleration to prevent engine surge from occurring.
42.
Finally, Henry was never artistically inspired by the graphic potential of the modern digital computer . ( O'Hanrahan 2005 ) He much preferred the direct interaction afforded by the clearly visible interconnecting mechanical components of the earlier analogue computer and as a consequence of his drawing machines also.
43.
In'normal'computers, the information is stored in a digital way-0 / 1, on / off-implemented by letting a current flow in one of two directions ( in analogue computers, however, the most elementary bit of information can have any number of values ).
44.
An analogue computer of some complexity, known simply as " The Fruit Machine ", was fed the bearing and range directly from the operator console, reading the goniometer setting directly, and the range from the setting of a dial that moved a mechanical pointer along the screen until it lay over a selected target.
45.
Lord Kelvin, widely regarded as Britain's leading scientist first proposed using an analogue computer to solve the equations which arise from the relative motion of the ships engaged in the battle and the time delay in the flight of the shell to calculate the required trajectory and therefore the direction and elevation of the guns.
46.
These included effects displayed on a visual display screen using a cathode-ray oscilloscope ( Ben F . Laposky in Cybernetic Serendipity 1968 ) and those produced using a mechanical plotter linked to either a digital ( Lloyd Sumner in Cybernetic Serendipity 1968 ) or analogue computer ( Maughan S . Mason in Cybernetic Serendipity 1968 ).
47.
The museum also includes the world's oldest working digital computer ( the ICL 2966 mainframe from the 1980s, a wide range of analogue computers, a hands-on retrocomputing gallery, and several restoration projects such as the PDP-8 and the PDP-11-based air traffic control system from London Terminal Control Centre at West Drayton near London.
48.
Kitching claimed that the language was a direct result of working with analogue computers, and reflected an electrical engineer's approach to the problem of system representation : " Because of its electrical analogy, the Odum system is relatively easy to turn into mathematical equations . . . If one is building a model of energy flow then certainly the Odum system should be given serious consideration . . ."
49.
This was in stark contrast to the invisible and indirect workings of the later digital computer : " the mechanical analogue computer, was a work of art in itself, involving a most beautiful arrangement of gears, belts, cams differentials and so on-it still retained in its working a visual attractiveness which has now vanished in the modern electronic counterpart; & I enjoyed seeing the machine work & " . ( Henry, 1972)
50.
In 1953, India's first indigenous electronic analogue computer for solving linear equations with 10 variables and related problems was designed and developed by Samarendra Kumar Mitra and was built under his direct personal supervision and guidance by Ashish Kumar Maity in the Computing Machines and Electronics Laboratory at the ( ISI ), Calcutta . [ 1 ] [ 2 ] This computer was used in computation of numerical solutions of simultaneous linear equations using a modified version of Gauss Seidel iteration . [ 1 ] [ 2]
