Infinite energy is necessary to travel more than about seventy years into the past. However, could a time projector not overcome this limitation by making multiple short pastward journeys? Maybe each pastward journey builds up a potential that increases the energy needed for each "subsequent" journey? In any case, the projector would be halted by obstacles like mountains etc. Unable either to continue pastward or to emerge in the present, it would be obliged to return to the future.
We know that Saunders and Hull were not the only time travellers. There is unlimited scope for other stories set in this timeline. And what I would really like to see is a much longer Technic History.
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