Relic Information query matches
Matching on query: Unique id = 17/97, Name = any, Associated machine = any, class = any
Unique id/year of acquisition: 17/97
Name: Paper tape reader
Paper tape reader
Other nos on object: none
Description: Paper tape reader, 1000 characters per second. Silver-grey metal casing with the top open (missing ?). The front has the reading mechanism, which includes a roller attached to a large motor inside, a clear plastic lens, the reader itself and a plastic channel through which the tape would be fed. A lever on the side is depressed to operate the machine. Inside is the motor, made by the Sun Electrical Co. Ltd.,London, and operating at 1400 rpm at 200 Volts. The opposite end of the motor is attached to a fan which sucks air in through a circular grid in the rear. Also inside is a light bulb made by (?) British Pre-focus. Together with the grill, there are two circular multi-pin sockets in the rear, one male, one female. The outer casing is scratched and rusty and coming apart. Rear sockets appear badly corroded.
Machine: EDSAC II
DW: This is a tape reader, photo-electric type which was developed at the Computer Laboratory, to read in paper tape at a thousand characters a second with the ability to stop on a single character. It is a very simple construction. It has a motor which revolves a cylinder which is pressed against the tape and it pulls it forward - there is a brake which is actuated by electro magnet underneath and is strong enough to stop the tape in spite of the rotor pulling it forwards. This is only capable of reading a 5-hole tape unlike the others which were developed from this by Elliots and the Engineering workshop. This is a lamp - it's reflected here down onto the tape. There are photo-cells underneath and there is a mechanism on the right so the tape can be loaded sideways and there is an essential button on the top which allows the tape to be ejected at full speed without being read. These were in use for many years.
Q:What machine were they first and last used with?
DW: They were first used with EDSAC 2 and Elliots supplied them to a fair number of other computers throughout the UK and abroad, and when they were last used I'm not sure. This was made about 1957 but was in use probably until the 70's or 80's.
See also: 7/97
See also: 71/99
Number of matches = 1
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