Re: Metal Plate

[Jim <alarminex@xxxxxxx>]

On Dec 16, 8:11=EF=BF=BDam, nick markowitz <nmarkow...@xxxxxxxxx> wrote:
> On Dec 15, 9:14=EF=BF=BDpm, "ABLE1" <royboynos...@xxxxxxxxxxxxx> wrote:
>
>
>
>
>
> > Well it would seem that my absolute guess was spot on.
>
> > Oh goodie for me!!!!
>
> > Les
>
> > "RockyTSquirrel" <gafa@/nospam/usa.com> wrote in message
>
> >news:1NadnUIUCITjvLXWnZ2dnUVZ_gCdnZ2d@xxxxxxxxxxxxxxx
>
> > > ademco =EF=BF=BDmade one back in the 70's =EF=BF=BDthat had a complet=
e switch/magnet =EF=BF=BDin
> > > the
> > > jam =EF=BF=BDand a metal plate on the moving part..
> > > (no magnet under the metal plate..)
> > > the units could be used =EF=BF=BDon a metal door without =EF=BF=BDthe=
 metal plate..
> > > the unit =EF=BF=BDworked best if the switch/maget =EF=BF=BDwas placed=
 in a wooden jam,
> > > cause if a metal jam =EF=BF=BDthe magnet would over time magnetize th=
e jam =EF=BF=BDand
> > > the
> > > switch would become questionable at best....
> > > we used hundreds of them up till around 1981.
> > > RTS
>
> > > "CH=EF=BF=BDIS" <s...@xxxxx> wrote in messagenews:pnSVm.56159$Db2.177=
54@xxxxxxxxxxx
> > >> "mleuck" wrote...
> > >> > On Dec 15, 9:28 am, "Bob La Londe" <nos...@xxxxxxxxx> wrote:
> > >> > > Just a metal plate. That's all that was found on the top of the
> > >> > > doors.
> > >> > > Held down with little nails. It worked for a long time. The plas=
tic
> > >> > > contact recessed in the jamb cleared when the doors were close. =
What
> > >> > > heck
> > >> > > was it and how did it work?
>
> > >> > > It finally failed. That's how I discovered this little oddity. I
> > >> > > think
> > > I
> > >> > > recall somebody on here mentioning something like it in the past=
.
>
> > >> > I've seen that before but there was a magnet under that plate, str=
ange
> > >> > setup
>
> > >> Which would magntize the plate and keep it working when the door war=
ps
> > >> and
> > >> alignment is lost???
>
> > >> Just guessing... never seen it done.
>
> > >> - Chris
>
> Ademco had some really strange contacts and switches back then but
> this was also the age when we foiled and you needed all the ornaments
> to make things work.
> the magnets worked on repulsion theory .-

Which contacts were those?

The # 56 used attraction to the metal plate.
I don't remember any that used repulsion. Although there were some
that were pretty repul ....sive!