<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Meanwhile, I have heard that 50 to 60 cycles is the optimum if you want to
cause fibrillation.</DIV>
<DIV> </DIV>
<DIV>My parent’s house, built in 1950, was wired with fuses rather than circuit
breakers. So the changeover was something after that.</DIV>
<DIV> </DIV>
<DIV>If you go back 100 years or so, they wired houses with fuses on both sides
of each circuit. Eventually somebody realized that if the neutral fuse
blew, you then had a non-functioning circuit that was still energized.
That probably was an unpleasant surprise for a lot of people before they
realized it wasn’t a good idea to fuse the neutral.</DIV>
<DIV> </DIV>
<DIV>Jim Becker</DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV><FONT size=3 face=Calibri></FONT> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=soffiler@gmail.com>Stephen
Offiler</A> </DIV>
<DIV><B>Sent:</B> Saturday, December 21, 2019 7:10 AM</DIV>
<DIV><B>To:</B> <A title=at@lists.antique-tractor.com>Antique Tractor Email
Discussion Group</A> </DIV>
<DIV><B>Subject:</B> Re: [AT] [OT] Has anyone seen one of
these??</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV dir=ltr>
<DIV dir=ltr>I'll admit I had no idea there was ever much of a DC grid, beyond
the earliest of early days when Edison supported DC and Tesla supported AC and
electric power was an untamed frontier.
<DIV> </DIV>
<DIV>Carl's comment about working with AC vs DC might refer to the workings of
the appliance. Agreed, generally, volts times amps equals watts and it
doesn't matter AC vs DC. That is 100% true for resistive loads like
lightbulbs. It is not quite true for inductive loads like motors, but OK
as a first-pass approximation.</DIV>
<DIV> </DIV>
<DIV>The major difference with having DC around is safety. If you get
zapped by 120VAC, the reversing polarity means crossing thru 0 volts 120 times
per second, which tends to kick you away. DC does not reverse, and the
steady voltage tends to lock up your nervous system and kill you. Back in
the early days, conductor insulation was not exactly up to modern standards, nor
was there much in the way of safety watchdogs like Underwriter's Labs etc., so
electric shock was more of a threat.</DIV>
<DIV> </DIV>
<DIV>Steve O.<BR></DIV>
<DIV> </DIV></DIV>
<DIV> </DIV>
<DIV class=gmail_quote>
<DIV class=gmail_attr dir=ltr>On Fri, Dec 20, 2019 at 4:37 PM
<<A>szabelski@wildblue.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">Working
with a 115VDC system would be no different than working with a 120VAC system.
You house has a 100A or 200A service, that doesn’t mean you can draw
that current at every wall plug. Your breakers would limit the current and
trip if you try to pull more than rated.<BR><BR>I would guess that a house
back in the day of 115VDC had a standard series of four cell fuse blocks with
2, 3, 5, 10, and maybe a couple of 15A fuses. When I was a kid in Detroit, our
house had such a set up for our old 80A 120VAC house service (it was mounted
on the back porch, outside, but sheltered from the weather.). Fuses were still
in use up to the 40’s - 50’s.<BR><BR>Carl<BR>----- Original Message
-----<BR>From: <A target=_blank>szabelski@wildblue.net</A><BR>To: Antique
Tractor Email Discussion Group <<A
target=_blank>at@lists.antique-tractor.com</A>><BR>Sent: Fri, 20 Dec 2019
16:05:51 -0500 (EST)<BR>Subject: Re: [AT] [OT] Has anyone seen one of
these??<BR><BR>Cecil, this would only be about 5 to 6 amps at 115VDC. If you
want it to run, you’ll have to put 10 car batteries in series to get it to do
so.<BR><BR>Putting 10 car batteries in series could give you a potential DC
current equal to about the current from the weakest battery.<BR><BR>Batteries
add voltage when in series, and maintain the current rating of one individual
battery. Batteries in parallel maintain the voltage level of one individual
battery, and the current add together.<BR><BR>On the Abrams we used a
series-parallel combination of six 12V, 100 AH, batteries to get a battery
system rated at 24 VDC and 300 AH. Three sets of 2 batteries in series,
connected in parallel.<BR><BR><BR> Carl<BR><BR><BR>-----
Original Message -----<BR>From: Cecil Bearden <<A
target=_blank>crbearden@copper.net</A>><BR>To: <A
target=_blank>at@lists.antique-tractor.com</A><BR>Sent: Fri, 20 Dec 2019
09:42:32 -0500 (EST)<BR>Subject: Re: [AT] [OT] Has anyone seen one of
these??<BR><BR>OK, this is old, I have found ads dating back to 1912 showing
this. It <BR>is an old shop vacuum. When it was mounted on casters
it was used in <BR>the home. US radiator corp owned the invincible
vacuum mfg co. I don't <BR>know if I can use it for cleaning out the
tractor cab, the motor states <BR>3/4 hp on the nameplate. It also
mentions DC, so I have to inspect when <BR>I get it this afternoon. 115 V on
D.C would knock you into the next <BR>room.... My wife wants to
turn it into a table lamp.... I am more <BR>of a purist, I
want to see it
work....<BR><BR>Cecil<BR><BR><BR>_______________________________________________<BR>AT
mailing list<BR><A target=_blank>AT@lists.antique-tractor.com</A><BR><A
href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com"
rel=noreferrer
target=_blank>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</A><BR><BR>_______________________________________________<BR>AT
mailing list<BR><A target=_blank>AT@lists.antique-tractor.com</A><BR><A
href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com"
rel=noreferrer
target=_blank>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</A><BR></BLOCKQUOTE></DIV></DIV>
<P>
<HR>
_______________________________________________<BR>AT mailing
list<BR>AT@lists.antique-tractor.com<BR>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com<BR></DIV></DIV></DIV></BODY></HTML>