| |
KF5JRV > TECH 08.09.16 11:32l 6 Lines 738 Bytes #999 (0) @ WW
BID : 1612_KF5JRV
Read: GUEST
Subj: Binoculars
Path: IW8PGT<CX2SA<N0KFQ<KF5JRV
Sent: 160908/0915Z 1612@KF5JRV.#NWAR.AR.USA.NA BPQK1.4.65
The first binoculars, or field glasses, were essentially twin telescopes, which were used by navigators and soldiers alike. The Dutch lensmaker Hans Lipperhey (also known as Johann Lippershey), who is often credited with inventing the telescope, is thought to have been the first person to pair telescopes to create binoculars in the early 1600s. But the Viennese camera pioneer Johann Voigtländer is also recognized for his individually focused paired telescopes, which he created in 1823. Improvements to binoculars in the second half of the 19th century included a central-focusing mechanism and the use of prisms to correct the inversion of images produced by more powerful lenses.
73, Scott kf5jrv
KF5JRV @ KF5JRV.#NWAR.AR.USA.NA
Read previous mail | Read next mail
| |
