2 ч 24 мин, 1 сент 1844 г. -
Описание:
Work begins in Washington on laying the line to Baltimore using poles. They used chestnut poles of seven meters in height, and 60 meters apart. Two wires were laid, Number 16 copper wire, covered by cotton thread with shellac, and a covering mixture of "beeswax, resin, linseed oil, and asphaltДобавлено на ленту времени:
Дата:
2 ч 24 мин, 1 сент 1844 г.
Сейчас
~ 179 г назад
