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Computer Applications to Tides in the National Ocean Survey (Supplement of SP 98).


Year: 1982
Language: english
Author: Bernard D. Zetler
Genre: Reference book
Publisher: NOAA
Edition: 1
Format: PDF
Quality: OCR with errors
Pages count: 94
Description: The state of the art in tide analysis and prediction reached levels of achievement in the early part of the 20th century that were not significantly improved upon for about 50 years. Even the early electronic computers (IBM 650 and 1620 were the f i r s t acquired by the U.S. Coast and Geodetic Survey) were unable to outperform the mechanical tide prediction machine completed by R. A. Harris and E. G. Fischer in 1910. However, the advent in the early 1960's of new, faster electronic computers finally brought about the replacement of the various classical tide analysis and predicting procedures.
That the predicting machine resisted so well and so long its eventual replacement, is a tribute to the skill and ingenuity of its creators. The machine had the ability to sum continuously with great precision 37 incommen- surable cosine curves of periods ranging from 8 cycles per lunar day to 1 cycle per lunar year, draw a continuous plot, and select the times and heights of extremes (high and low waters). In the rrost recent years, it produced automati- cally a typed manuscript ready for reproduction and inclusion in the tide
tables. Those of us involved in replacing this machine had severely mixed emotions for it was a remarkable mechanical achievement worthy of respect. Nevertheless, it was a relief to know that we were no longer dependent for tide predictions on one single set of hardware that would eventually wear out or, even worse, could be terminated by some natural or man-made catastrophe.
Additional info: Special Publication nº98 is here:

Manual Of Harmonic Analysis And Prediction Of Tides; special publication nº98. - Paul Schureman [1958, PDF]

Author: Paul Schureman | Year: 1958 | Language: english | Format: PDF | Quality: OCR with errors | Pages count: 332 | Genre: Reference book

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