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| GK:
--- Quote from: chickenHeadKnob on June 21, 2013, 08:53:30 am --- Due to symmetry in the trigonometric functions you can further compress the domain to --- End quote --- Yes, of course. You just read the table in the opposite direction for cos instead of sin or sin instead of cos: |
| woodchips:
Wow, found this post and delayed going to bed by a couple of hours! Some comments, my interests are in mechanical analogue computers so similar. Have you seen the differential analysers by Vannevar Bush etc in the 1930s? Also an earlier one, 1890s, for calculating tides but I can't at the moment track this down as to the why or how. What is the current book collection? A list of author, title and brief comments would be useful. Another interest of mine is wind turbines so I have some books on waveforms as regarding electromagnetism, again, similar but not identical. Hewlett Packard and Tektronix made large screen monitors, occasionally available. I have a HP 143S which works to 15MHz in X and Y. There is also the Kikusui 5121A but that is electromagnetic deflection so 1kHz X and 10kHz Y. I have some sine cosine pots, somewhere. They were rescued from some 1950s aircraft navigation equipment, mechanical analogue computers. In post 44 a comment was made about circular slide rules. Find a 1 arc second theodolite for the glass discs and reading method. Another wonderful piece of technology that electronics has consigned to the scrap heap. Bob |
| GK:
Hi Bob, I'll keep an eye out for those X-Y monitors you mention, thanks! I'm not particularly familair with any of the old mechanical analog computers. My book collection is almost exclusively concerned with electronic analog computers. Not sure if it is still of interest, but on the bookshelf I currently have: 1) Analog and Hybrid Computing Hyndman, D. E. 2) Fundamentals of Analog Computers Weyrick, Robert C. 3) Analog computer programming Michael G. Rekoff 4) Introduction to analog computation Ashley, J. Robert 5) Analog Computation and Simulation: Laboratory Approach Jenness, Roger R. 6) Introduction to Electronic Analogue Computers C. A. A. Wass 7) Analogue Computing at Ultra-High Speed Donald Mackay 8 ) Computation by Electronic Analogue Computers Borsky, V. and Matyas, J., 9) Electronic Analog Computer Primer Stice, James E. & Bernet Swanson 10) Analogue Computers I. I. ETERMAN 11) Introduction To Electronic Analog Computers Warfield, John. N. 12) Analog/logic computer programming and simulation Fred J Ricci 13) Computer Handbook Huskey, Harry D. 14) Principles of Analog Computation Smith, George W. and Roger C. Wood 15) Basic Analog Computation Gerald R. Peterson 16) Analog computation in Engineering Design Rogers and Connolly 17) Analog methods Karplus and Soroka 18) Analog simulation Karplus 19) Hybrid computation Bekley and Karplus 20) High Speed analog computers Tomovic and Karplus 21) Design fundamentals of analog computer components R. M. Howe 22) Analog computation Albers S. jackson 23) Electronic analog computers Korn and Korn 24) Electronic analog and hybrid computers (DC analog computers) Korn and Korn 25) Methods of solving engineering problems using analog computers Leon Levine 26) Analog computer techniques C. L. Johnson |
| SeanB:
Those vector analysers that were on here a few months ago would have made nice XY monitors, they have equal bandwidth in both channels, and the signal amps inside have sine and cosine generators. |
| woodchips:
GK, thanks for the book list, only have a couple of them. They are full of calculus and similar and my maths simply isn't up to that. Had a scrummage in the library and the following might be of interest. Again, more towards mechanical analogue computers or electromagnetism but if you see them for a £ (or local currency of course) or two then worth buying, I reckon anyway. 1) Electronic Digital Integrating Computers, Digital Differential Analysers - Mayorov 2) Electronic Computers, Principal & Application - Ivall (trivial level) 3) Graphical & Mechanical Computation - Lipka 4) The MIT Radiation Laboratory Series, 28 volumes but in particular Theory of Servomechanisims - James Computing Mechanism & Linkages - Svoboda Components Handbook - Blackburn Waveforms - Chance 5) The Journal of the Franklin Institute, articles about the Bush differential analyser These are electromagnetism books, but might have some ideas for programs to run 6) Elementary Treatise on Curve Tracing - Frost 7) Practical Curve Tracing - Duncan 8) Alternating Current Waveforms - Kemp 9) Waveform Analysis - Manley 10) Practical Geometry & Engineering Graphics - Abbott 11) No particular book but equalisation of telegraph lines, under the ocean etc, not trivial! Otherwise, I have found one of the sine/cosine pots. It is 14.4k and in a servo size 15 case. Came from a co-ordinate converter used in the navigation system (Green Satin) used in 1950s bomber aircraft, no tolerance specs but must be pretty good. The tide predictor was designed by Thompson, Lord Kelvin, in the 1890s but still can track down the article. Some in the Britannica to give a flavour. Hope this is of some interest. |
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