| |
KF5JRV > TECH 20.10.16 12:34l 6 Lines 252 Bytes #999 (0) @ WW
BID : 3911_KF5JRV
Read: GUEST DK3UZ OE7FMI
Subj: Magnetized Needles
Path: DB0FHN<DB0PM<OE2XZR<OE5XBL<F1OYP<ON0AR<GB7CIP<N0KFQ<KF5JRV
Sent: 161020/1124Z 3911@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Magnetized Needles
Magnetized needles used as direction pointers instead of the spoon-shaped
lodestones appeared in the 8th century AD, again in China, and between 850 AD
and 1050 AD they seem to have become common as navigational devices on ships.
Read previous mail | Read next mail
| |
