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From: ken@rochester.arpa (Ken Yap)
Newsgroups: sci.electronics,talk.bizarre
Subject: Re: "Magic Eye" tubes
Message-ID: <540@sol.ARPA>
Date: Tue, 14-Jul-87 12:19:56 EDT
Article-I.D.: sol.540
Posted: Tue Jul 14 12:19:56 1987
Date-Received: Thu, 16-Jul-87 06:05:51 EDT
References: <1495@frog.UUCP> <35ffa63b.b8ab@apollo.uucp> <6@spar.SPAR.SLB.COM> <1384@brspyr1.BRS.Com> <1841@kitty.UUCP>
Reply-To: ken@rochester.UUCP (Ken Yap)
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 13
Xref: mnetor sci.electronics:969 talk.bizarre:2490

|2.	The "Decatron" tube, which consisted of a round tube with ten
|	anodes, equally spaced about a circle.  It was nothing more than
|	a multiple neon lamp, since it displayed no digits, but each anode
|	was labeled on the panel.  Example: a Baird-Atomic nuclear scaler
|	that I once used.

Actually it was a little more than a multiple neon lamp because it had
auxiliary electrodes which could cause the glow to migrate to the next
anode. By applying the appropriate sequence of pulse waveforms you could
get it to count. Hence its use as a high speed counter before RTL, DTL
and TTL counters like 7490 came along.

	Ken