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Displaying Results 1 - 21 of 21
• ### International co-operation in space research

Publication Year: 1963
| PDF (121 KB)
• ### A high power audio frequency push-pull transistor amplifier to drive an electro-magnetic vibrator

Publication Year: 1963, Page(s):191 - 196
| | PDF (600 KB)

A 1 kVA electro-magnetic vibrator, having a nominal impedance of 10 ohms and requiring a 150 V peak excitation source, is taken as a model for studying the problems involved in driving large vibrators. The output transformer, usually associated with audio power amplifiers, determines the amplifier low frequency response. A design for a high power transformerless transistor push-pull amplifier is c... View full abstract»

• ### Hybrid digital/analogue servomechanisms

Publication Year: 1963, Page(s):197 - 201
Cited by:  Papers (1)
| | PDF (606 KB)

The paper is an introduction to hybrid digital/analogue servo systems utilizing the application of digital techniques to conventional closed-loop servo systems. The term hybrid is used to describe systems where the error signal is derived digitally and then converted into an analogue signal for the operation of the power source. This results in an improved system accuracy compared with that obtain... View full abstract»

• ### Discussion on 'Hybrid digital/analogue servomechanisms'

Publication Year: 1963
| PDF (71 KB)
• ### The N.I.R.N.S. 7 GeV proton synchrotron

Publication Year: 1963, Page(s):203 - 204
| PDF (1182 KB)
• ### A high-resolution electronic sector-scanning sonar

Publication Year: 1963, Page(s):205 - 208
| | PDF (593 KB)

The success of sea-trials of an experimental pulsed sonar system using within-pulseÂ¿ electronic scanning has led to the development of a new version using a considerably larger number of channels and a shorter wavelength in the water. The new system, which has 30 channels and works at a carrier frequency of 500 kc/s in the water, is designed for a maximum range of 100 yards and a scanned sector ... View full abstract»

• ### Points from the discussion on "A high-resolution electronic sector-scanning sonar"

Publication Year: 1963
| PDF (99 KB)
• ### Square-loop ferrites with sinusoidal magnetization

Publication Year: 1963, Page(s):209 - 212
| | PDF (390 KB)

The switching speed of square-loop ferrite cores is limited mainly by the restricted speed of domain wall movement, and not by eddy currents as in a metallic core. Their use in magnetic amplifiers and modulators allows the excitation frequency to be raised, giving greater bandwidth. This paper uses a simple theory of flux reversal in square-loop ferrites to predict switching speed with sinusoidal ... View full abstract»

• ### A telecommunication and telecontrol system for a crude oil pipeline

Publication Year: 1963, Page(s):213 - 226
| | PDF (4386 KB)

The paper describes a comprehensive telecommunications, telemetry, telecontrol, and instrumentation system which was installed on a crude oil pipeline in North East India. The philosophies which led to the final design are discussed. Descriptions of the equipment used are given together with tables of functions controls and alarms. View full abstract»

• ### Direct wide-band phase shifters

Publication Year: 1963, Page(s):227 - 229
| | PDF (284 KB)

Two functions which differ only in phase and that by 90 deg, are related to each other by the Hilbert transform and to derive one from the other it is necessary to know the values of the input function at all times, past as well as future, right up to infinity. However, the amplitude error will be less than Â± 1 dB if the input values are considered up to a time duration equal to the period of the... View full abstract»

• ### New speaking clock using magnetic recording

Publication Year: 1963
| PDF (138 KB)
• ### A multi-function unit static switching system for industry

Publication Year: 1963, Page(s):231 - 240
| | PDF (1158 KB)

The most important requirements of a control engineer for a static switching system are that it should be easily understood and easily applied. The features considered necessary to meet these requirements are discussed. A range of units having these features has been produced and the principal unit is described in detail. Some indication of its versatility is given and other units of the system ar... View full abstract»

• ### Discussion on Â¿A multi-function unit static switching system for industryÂ¿

Publication Year: 1963, Page(s):240 - 241
| PDF (229 KB)
• ### Television standards conversion

Publication Year: 1963, Page(s):242 - 244
| PDF (712 KB)
• ### Adaptation of sonar techniques for exploring the sediments and crust of the Earth beneath the ocean

Publication Year: 1963, Page(s):245 - 249
Cited by:  Papers (1)
| | PDF (2162 KB)

The continuous seismic profilerÂ¿ is an instrument system for studying the structure of sediments and rock beneath the sea floor by the seismic reflection method. Pulses of sound reflected at near-normal incidence are automatically timed and correlated by the recording method used in echo sounding. The sound source is chosen to give a repeatable pulse having a broad spectrum rich in low frequenci... View full abstract»

• ### Points from the discussion on "Adaptation of sonar techniques for exploring the sediments and crust of the Earth beneath the ocean"

Publication Year: 1963
| PDF (94 KB)
• ### Signal processing in radar and sonar directional systems (with special reference to systems common to radar, sonar, radioastronomy and ultrasonics)

Publication Year: 1963
| PDF (94 KB)
• ### Activation analysis applied to steel production

Publication Year: 1963, Page(s):251 - 259
| | PDF (1224 KB)

The techniques of activation analysis are discussed and equipment suitable for application to steel production described which uses a neutron generator based on the DÂ¿T reaction. These techniques offer the possibility of direct process control, since the analyses can be performed automatically and the results are presented in a form which could easily be applied to a controlling mechanism. View full abstract»

• ### Obituary

Publication Year: 1963
| PDF (164 KB)
• ### The condenser microphone and some of its uses in laboratory investigations

Publication Year: 1963, Page(s):261 - 274
| | PDF (1812 KB)

The development of techniques for measuring sound pressures are discussed, with special reference to the accuracy of various methods. After comparing the advantages and disadvantages of different kinds of laboratory microphone in use today, the characteristics of the condenser microphone are discussed more fully. The theory brings to light the factors which govern the frequency response, sensitivi... View full abstract»

• ### Radio engineering overseas ...

Publication Year: 1963, Page(s):275 - 276
| PDF (306 KB)