Yes, I am done, no more about people, places and things in the past. If the authors permit, I post the following from the book regarding antimagnetic antitank mines:
The works were conducted in the most primitive way-by manual short-hole drilling. Next, blasting out, collectin& and sifting chlopinite (aka hlopinite)- a pitch-black mineral containing uranium. Antimagnetic anti-tank mines weighing up to 5 kg were used as explosives.
Air blasts could be used should there be any need for seismic surveying. Vladimir Ustyuzhaninov, who in the 1950s worked as a geophysicist in the Western Siberia, recalled: "To avoid a great waste of time and material assets in well-drilling, in the 1950s theKolpashevskiy expedition came to utilizing a method of earthquake ground excitation by air blasts. The charges that were selected by trial were placed in the trees at a certain height." Blasting operations could be employed as well in case of a need for ditching and prospect holes drilling.
In a brief history of antitank mines, since the track was the most vulnerable portion of the tank, the mine detonated by heavy pressure. As explosives became more sophisticated, and tank armour became better, a new method was introduced, antimagnetic antitank mines. One might think they have a big magnet inside that leaps up when a piece of metal drives over it, and detonates the mine. Actually not so.
The mine contains a radio oscillator which sits humming away quietly. It has a loop of metal, which acts as a "variable inductor." When metal passes over or near the variable inductor, the metal causes the circuit to "detune" or drop its frequency rapidly. This is the signal to go BOOM!
These are the same mysterious loops at traffic control devices which one passes over or stops one's car on at a red light. The car shifts the oscillator built into the traffic control device, which kindly sends a signal for the light to change, rather than detonating 4kg of RDX.
Of those who are gone, I only say this - if the students from Ural Polytechnic had all been students of the biology of birds, wouldn't there be birdwatching books and notebooks? Of course. Or if they were foresters - wouldn't they have reams and reams of notes on the forests of the western Urals? Naturally.
But they were mostly radio engineers. What might a radio engineer bring on a field trip?
I will not develop the thought more, for I wish to leave the dead in peace. Peace to all who post on this platform.