Instruction manual for Precision Graphic Recorder (PGR)

Knott, S. T.; Witzell, Warren E.

doi:10.1575/1912/25168

Cited by 5 publications

(4 citation statements)

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“…6. The position fixes relative to the ship for the neutrally buoyant floats were obtained using suspended hydrophones [Swallow, 1955] and also using two pairs of towed hydrophones, the output of which was displayed on the ship's precision graphic recorder [Knott and Witzell, 1960] while the ship was underway.…”

Section: Introductionmentioning

confidence: 99%

Some measurements of current off the Somali Coast during the Northeast Monsoon

Bruce¹,

Volkmann²

1969

J. Geophys. Res.

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Geostrophic and direct current measurements off the Somali coast during the northeast monsoon of 1964–1965 indicate a large subsurface north‐going current across a 9°N section between 52° and 53°30′E and a south‐going current of similar characteristics between 53°30′ and 55°30′E. The characteristics of the flow suggest the existence of an anticyclonic gyre having a transport of approximately 70×106 m3/sec, the center being near that of the gyre found during the southwest monsoon.

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Section: Introductionmentioning

confidence: 99%

Some measurements of current off the Somali Coast during the Northeast Monsoon

Bruce¹,

Volkmann²

1969

J. Geophys. Res.

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“…If the reed-switch c losure that occurs with each sweep of the PGR helix is fed through a programming system such as the PGR keying-program circuit (see Circuits H30 and H30 -A, S . T. Knott and W. E. Witzell, 1960) , an even more flexible triggering program (with delays of up to 12 sweeps of the PGR) becomes available (see "Progr aming-Range Gati ng" , op. cit.…”

Section: Triggering Of Oscilloscopes Relays and Cc:tmerasmentioning

confidence: 99%

“…During the development of the Precision Graphic Recorder (Knott and Witzell, 1960) as an echo-sounder recorder, various electro-mechanical devices have been built to augment its usefulness as a readout and programmer for other oceanographic equipment. The Sweep-Synchronized Positionable Trigger (Figs.…”

Section: Introductionmentioning

confidence: 99%

Sweep-synchronized positionable trigger and supplementary components

Witzell¹

1964

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This report describes the Sweep-Synchronized Positionable Trigger, together with its functions and supplementary components, as designed and built for use with the Precision Graphic Recorder (PGR) at the Woods Hole Oceanographic Institution. The positionable trigger provides a means for plotting a variable on the PGR record as a function of t i me, for triggering equipment such as oscilloscopes at any time, for displaying ship's heading, and for supplying, semi-automatically, ocean depth to a ship-board computer.

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“…The re c orde r u n it of the PGR is a helical sweep-type graphic recorder which utilizes a damp , chemi cal recordi ng paper (Knott and Hersey, 1956;Knott and Witzell 1960}. Th e re c order d rive i s contr olled by precision power as is the scale-line generator which superimpos e s time-lines on the record.…”

Section: The Precis Ion Graphic Recor Dermentioning

confidence: 99%