scholarly journals Tide prediction machines at the Liverpool Tidal Institute

2020 ◽  
Vol 11 (1) ◽  
pp. 15-29
Author(s):  
Philip L. Woodworth
Keyword(s):  
Tide Gauge ◽  
100Th Anniversary ◽  
Tide Gauge Data ◽  
Basic Principles ◽  
The World ◽  
Gauge Data ◽  
Set Up ◽  
The Uk ◽  
Made In

Abstract. The 100th anniversary of the Liverpool Tidal Institute (LTI) was celebrated during 2019. One aspect of tidal science for which the LTI acquired a worldwide reputation was the development and use of tide prediction machines (TPMs). The TPM was invented in the late 19th century, but most of them were made in the first half of the 20th century, up until the time that the advent of digital computers consigned them to museums. This paper describes the basic principles of a TPM, reviews how many were constructed around the world and discusses the method devised by Arthur Doodson at the LTI for the determination of harmonic tidal constants from tide gauge data. These constants were required in order to set up the TPMs for predicting the heights and times of the tides. Although only 3 of the 30-odd TPMs constructed were employed in operational tidal prediction at the LTI, Doodson was responsible for the design and oversight of the manufacture of several others. The paper demonstrates how the UK, and the LTI and Doodson in particular, played a central role in this area of tidal science.

Set-up of Sydney Harbour by waves, wind and atmospheric pressure

1983 ◽  
Vol 34 (1) ◽  
pp. 97 ◽  
Author(s):  
RORY Thomson
Keyword(s):  
Water Level ◽  
Atmospheric Pressure ◽  
Tide Gauge ◽  
Confounding Factors ◽  
Average Depth ◽  
Tide Gauge Data ◽  
Sydney Harbour ◽  
Gauge Data ◽  
Set Up ◽  
The Waves

Nine years of hourly tide-gauge data from inside Sydney Harbour were detided and combined with wave- rider observations from outside, to test the effect of the waves on water level in the Harbour. Weather records were appended, to account for the confounding factors of wind and atmospheric pressure via a multiple regression analysis. The regression of water level on wave variance was found to be 2.88 cm m-2, in satisfactory agreement with the theoretical value of 3/4H, where H is the average depth of the Harbour entrance. Wind set up the Harbour most efficiently (0.48 cm perm s-1) when blowing toward 18� west of north. The regression of water level on atmospheric pressure was 0.74 cm mb-1, definitely less than 1.01 cm mb-1, the value of isostasy.

scholarly journals Determination of the absolute rate of sea level by using GPS reference station and tide gauge data

2005 ◽  
Vol 8 (3) ◽  
pp. 220-224
Author(s):  
Jiao Wenhai ◽  
Guo Hairong ◽  
Fu Yang ◽  
Wei Ziqing
Keyword(s):  
Sea Level ◽  
Tide Gauge ◽  
Reference Station ◽  
Absolute Rate ◽  
Tide Gauge Data ◽  
Gauge Data ◽  
The Absolute

The Unfinished Sexual Revolution

1971 ◽  
Vol 3 (4) ◽  
pp. 473-492 ◽  
Author(s):  
Laurie Taylor
Keyword(s):  
Sexual Revolution ◽  
Editorial Note ◽  
Memorial Lecture ◽  
Human Welfare ◽  
The World ◽  
Control Clinic ◽  
History Of ◽  
Set Up ◽  
The Uk ◽  
The University

Editorial note. March 17th, 1971 was the fiftieth anniversary of the opening by Marie Stopes of her birth control clinic in Holloway, London, the first of its kind in the UK and possibly in the world. In recognition of this notable event, the Board of the Marie Stopes Memorial Foundation, in conjunction with the University of York, has established a Marie Stopes Memorial Lecture to be given annually for a term of years. The first of the series was delivered on 12th March in the Department of Sociology, University of York, by Mr Laurie Taylor of that department. In introducing the speaker, Dr G. C. L. Bertram, the Chairman, emphasized the great contribution made by Marie Stopes to human welfare and gave a brief history of the clinic, which was soon moved to Whitfield Street. On Marie Stopes' death in 1958 the Memorial Foundation was set up to manage the clinic, still in Whitfield Street, and as a working monument to a great women.Mr Taylor's script is printed below as delivered and it will be seen that the lecture was a notable one. Not only that, but it was delivered with the verve of a Shakespearean actor and the members of the large and appreciative audience will not readily forget the occasion.

scholarly journals A 10-Year Comparison of Water Levels Measured with a Geodetic GPS Receiver versus a Conventional Tide Gauge

2017 ◽  
Vol 34 (2) ◽  
pp. 295-307 ◽  
Author(s):  
Kristine M. Larson ◽  
Richard D. Ray ◽  
Simon D. P. Williams
Keyword(s):  
Tide Gauge ◽  
Signal Propagation ◽  
Propagation Delay ◽  
Terrestrial Reference Frame ◽  
Water Levels ◽  
Sea Surface ◽  
Ocean Tide ◽  
Gps Receiver ◽  
Tide Gauge Data ◽  
Gauge Data

AbstractA standard geodetic GPS receiver and a conventional Aquatrak tide gauge, collocated at Friday Harbor, Washington, are used to assess the quality of 10 years of water levels estimated from GPS sea surface reflections. The GPS results are improved by accounting for (tidal) motion of the reflecting sea surface and for signal propagation delay by the troposphere. The RMS error of individual GPS water level estimates is about 12 cm. Lower water levels are measured slightly more accurately than higher water levels. Forming daily mean sea levels reduces the RMS difference with the tide gauge data to approximately 2 cm. For monthly means, the RMS difference is 1.3 cm. The GPS elevations, of course, can be automatically placed into a well-defined terrestrial reference frame. Ocean tide coefficients, determined from both the GPS and tide gauge data, are in good agreement, with absolute differences below 1 cm for all constituents save K1 and S1. The latter constituent is especially anomalous, probably owing to daily temperature-induced errors in the Aquatrak tide gauge.

The Legal Process before 1968: The Juvenile Court

2020 ◽  
pp. 115-144
Author(s):  
Kenneth McK. Norrie
Keyword(s):  
World Wide ◽  
Juvenile Court ◽  
Young Offenders ◽  
Legal Process ◽  
Juvenile Courts ◽  
The World ◽  
The Usa ◽  
Set Up ◽  
Hearing System ◽  
Made In

This chapter explores the world-wide movement at the turn of the 20th century towards specialist juvenile courts to deal with children who commit offences. Following the lead of the juvenile court movement in the USA and Australia, the Children Act 1908 set up juvenile courts in both Scotland and England, though in Scotland these courts quickly acquired jurisdiction over both young offenders and children in need of care and protection. Originally little more than a separate set of procedural rules to be followed in the sheriff court dealing with children, an effort was made in the Children and Young Persons (Scotland) Acts 1932 and 1937 to give better effect to the idea of a separate court presided over by specialist judges. Though never nation-wide, these new, enhanced, juvenile courts took on many of the characteristics that were later adopted by the children’s hearing system, including the processes to be followed, the involvement of the children, the requirement to look at the child’s wider environmental circumstances (including the child’s welfare), and the outcomes available to the court.

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