11-year old "engineer" needs counseling
in [Design]
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From: Archimedes' Lever on 17 Jan 2010 21:24 On Mon, 18 Jan 2010 01:56:50 +0000, Dirk Bruere at NeoPax <dirk.bruere(a)gmail.com> wrote: >Archimedes' Lever wrote: >> On Sun, 17 Jan 2010 23:01:05 +0000, Dirk Bruere at NeoPax >> <dirk.bruere(a)gmail.com> wrote: >> >>> Archimedes' Lever wrote: >>>> On Mon, 18 Jan 2010 03:59:36 +0530, "pimpom" <pimpom(a)invalid.invalid> >>>> wrote: >>>> >>>>> Spehro Pefhany wrote: >>>>>> On Mon, 18 Jan 2010 03:10:35 +0530, the renowned "pimpom" >>>>>> <pimpom(a)invalid.invalid> wrote: >>>>>> >>>>>>> Howard Eisenhauer wrote: >>>>>>>> When I was in high school the physics teachers used to charge >>>>>>>> up >>>>>>>> capacitors & leave them lying around on the lab benches for >>>>>>>> the >>>>>>>> first >>>>>>>> year students. One of my buddies got wise to this ahead of >>>>>>>> time & >>>>>>>> sprayed his fingertips with clear acrylic before class. Went >>>>>>>> in, >>>>>>>> picked up the cap, waited for the dissappointed look on >>>>>>>> teach's >>>>>>>> face >>>>>>>> then handed it over to him. >>>>>>>> >>>>>>>> Priceless :> >>>>>>>> >>>>>>> I'm in one of the most remote regions of India where >>>>>>> electricity >>>>>>> other than batteries had been available for only a few years >>>>>>> when >>>>>>> I finished high school. Our science teacher, a French-Canadian >>>>>>> RC >>>>>>> brother in our mission school, told us that while mains >>>>>>> voltage >>>>>>> (230V over here) was dangerous, batteries weren't. To >>>>>>> demonstrate, he brought a tube radio battery, inserted a pair >>>>>>> of >>>>>>> wires into the 90V outlet and held the ends with his (dry) >>>>>>> hands. >>>>>>> >>>>>>> Most of us kids already knew it wasn't as simple as that, and >>>>>>> one >>>>>>> of my classmates told him to put both wire tips to his tongue. >>>>>>> He >>>>>>> did. /That/ too was priceless. >>>>>> 10 x 9V batteries in series would be just as effective. >>>>> 9V batteries were still not in common use here then. It was >>>>> either 90V or D cells. >>>>> >>>>>> I don't think I've seen a 90V "B" battery since I was about 12, >>>>>> and >>>>>> even then it was probably an old dead one. How long ago were >>>>>> they >>>>>> available in remote regions of India? >>>>>> >>>>>> >>>>> Don't remember for sure, but I think they were quite rare by the >>>>> end of the 60s. Let's see..... I finished high school when I was >>>>> 15 and started teaching myself electronics in my teens while >>>>> doing my B.Sc. I remember designing and building mains adapters >>>>> for legacy 90V tube radios. Yeah, transistors and proper >>>>> mains-operated tubes had taken over by then and only those who'd >>>>> bought those 90V sets in the 50s and early 60s had them by the >>>>> end of the 60s and early 70s. >>>>> >>>> >>>> The "B" cells I remember were 63 Volts. >>> Sure that wasn't 6.3V for the filament heater? >> >> >> I said "B" supply, dingledorf. They were hand held two-way radios of the >> Korean War era. I wish I still had them as I am sure they are worth >> something now. > >I do not think there is much of a market for rotted 50 year old "B" >batteries. The batteries were available long after the radios stopped being used. They may still be available. http://www.greenhillsgf.com/Project_63V_BatteryKit.htm
From: Michael A. Terrell on 17 Jan 2010 22:00 Dirk Bruere at NeoPax wrote: > > Archimedes' Lever wrote: > > Dirk Bruere at NeoPax wrote: > > > >> Archimedes' Lever wrote: > >>> > >>> The "B" cells I remember were 63 Volts. > >> Sure that wasn't 6.3V for the filament heater? > > > > > > I said "B" supply, dingledorf. They were hand held two-way radios of the > > Korean War era. I wish I still had them as I am sure they are worth > > something now. > > I do not think there is much of a market for rotted 50 year old "B" > batteries. No, but there are people looking for ones with clean labels to scan for reproduction battery housing for restore radios. Catalogs of that era listed 30, 60, 90 & 120 volt 'B' batteries. 'A' batteries were 2, 6.3 & 12.6 volts. 'C' batteries were usually 1.5 to 4.5 volts. Antique radio collectors would 'love' to see a 63 volt battery. :) -- Greed is the root of all eBay.
From: RFI-EMI-GUY on 17 Jan 2010 23:54 Reinardt Behm wrote: > On Sunday 17 January 2010 10:02 Falk Willberg wrote: > >> Common sense. And common sense (Hollymood movies) teaches, that >> cylindrical objects are not batteries but dynamite and the wires are >> used to ignite the dynamite. >> But it is also general knowledge how to deactivate any bomb: Wait for >> the counter to go down to 00:05 and the cut the blue wire. (Never cut >> the red wire!) > > This always makes me wonder wether there is a published standard for wire > colors in a bomb. > And what the punishment for not adhering to this standard? :-) > I think it is ISO-666 -- Joe Leikhim K4SAT "The RFI-EMI-GUY"� "Use only Genuine Interocitor Parts" Tom Servo ;-P
From: VWWall on 18 Jan 2010 00:44 Michael A. Terrell wrote: > Dirk Bruere at NeoPax wrote: >> Archimedes' Lever wrote: >>> Dirk Bruere at NeoPax wrote: >>> >>>> Archimedes' Lever wrote: >>>>> The "B" cells I remember were 63 Volts. >>>> Sure that wasn't 6.3V for the filament heater? >>> >>> I said "B" supply, dingledorf. They were hand held two-way radios of the >>> Korean War era. I wish I still had them as I am sure they are worth >>> something now. >> I do not think there is much of a market for rotted 50 year old "B" >> batteries. > > > No, but there are people looking for ones with clean labels to scan > for reproduction battery housing for restore radios. > > Catalogs of that era listed 30, 60, 90 & 120 volt 'B' batteries. 'A' > batteries were 2, 6.3 & 12.6 volts. 'C' batteries were usually 1.5 to > 4.5 volts. > > Antique radio collectors would 'love' to see a 63 volt battery. :) > I've seen batteries made from seven 9 volt batteries which were "stacked" together to simulate the old 67.5 volt batteries. They were 63 volts, of course. There was no 63 volt battery ever made. There were 67.5 volt "B" batteries; Eveready 467, for example. These were made from 45 standard 1.5 volt "A" cells in series. -- Virg Wall
From: Robert Baer on 18 Jan 2010 03:28
Falk Willberg wrote: > J.A. Legris schrieb: >> On Jan 16, 5:53 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: >>> On a sunny day (Sat, 16 Jan 2010 15:43:26 -0700) it happened don <don> wrote >>> in <HeGdne8ObvOX3M_WnZ2dnUVZ_jhi4...(a)forethought.net>: >>> >>>> http://www.signonsandiego.com/news/2010/jan/15/students-evacuated-sch... >>> US has turned into a bunch of paranoid schizofrenics. > > "A vice principal saw the student showing it to other students..." > Terrorists show their bombs around? > "... *empty* half-liter Gatorade bottle with some wires and other > electrical components..." > >> No, the U.S. has turned into a place where there's a reasonable chance >> of being harmed by crazies using anything from handguns, to assault >> rifles, to homemade bombs. > > Common sense. And common sense (Hollymood movies) teaches, that > cylindrical objects are not batteries but dynamite and the wires are > used to ignite the dynamite. > But it is also general knowledge how to deactivate any bomb: Wait for > the counter to go down to 00:05 and the cut the *blue* wire. (Never cut > the red wire!) > > BTW: Are cars allowed near U.S. schools? > > Falk ....are you talking about those containers of explosive liquid? |