Trial loading of Toshiba RT-SF 16 Radio
Casete Unit
Batery Explosive Detonator Timer
It was deduced by forensics that the timer was removed from its original box and reassembled inside the radio along with the detonator , batery and plastic explosive.
Fragment PT/35b
This fragment is at the centre of a confused and confusing mess of renumbered pages, inconsistent dates and general muddle which have led many people to speculate that it was actually a retrospective plant. These suspicions are heightened by the absence of any record during 1989 of a serious forensic investigation of the item. While scientists at the Royal Armament Research and Development Establishment (RARDE) were obsessing over other pieces of circuit board at that time PT/35b sat apparently overlooked in a side-room.
Despite theories to the contrary, detailed examination of the documentation doesn’t prove it was inserted retrospectively.
One thing seems reasonably certain. The scrap of collar and the shirt it was part of was extremely close to the explosion. The careful logging of the recovered debris shows four separate parts of that same shirt recovered from widely separated locations which form an almost perfect straight-line continuation of the “southern debris trail”. This all fits perfectly with the known distribution of the falling, wind-swept debris.
Was PT/35b, the infamous printed circuit board fragment, actually lodged in the cloth at that time? It’s impossible to say, but it has not been proved it wasn’t. What has been proved is something altogether different, something entirely unsuspected during the years when the defence teams were poring over the forensic notes and wondering if certain pages might have been added at a later date.
16 February 2016
Serious atempts to find out what the fragment PT/35b was began in earnest aſter it was handed over to Scotish detectives in January 1990.
Timer - MST-13 made by a Swiss firm called MEBO
Physical and chemical analysis carried out at the University of Strathclyde, while policemen patiently telephoned and visited manufacturers of electronic components and suppliers of raw materials, found nothing earth- shatering. The raw materials were unremarkable, used in millions of gadgets and gizmos worldwide.
Serious attempts to find out what the fragment PT/35b was began in earnest aſter it was handed over to Scottish detectives in January 1990.
However, a detailed report dated September 1990 cataloguing the effort noted one particular feature that seemed anomalous. Printed circuit boards have a coating on the circuitry, known as ‘tinning’, applied to make the components easier to solder. In mass manufacturing this coating is almost always a tin/lead alloy, however PT/35b had a coating of pure tin. It had been applied in such a way as to suggest this had been done by electroless plating, a method used by amateurs making only a few boards as a hobby.
Fragment PK/1978
Fragment PK/339 Cms
Fragment PI/995 10 20
Fragment PK/1973
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