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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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11th Jan 2019, 8:43 pm | #21 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
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Re: Old books/magazines and the gems within
Hi Gents, soft iron wire ~ florists binding wire, En Cu wire, Scientific wire co.
Note that these will not make a Wimshurst machine, that uses rotating glass discs. It will make a nice induction or shocking coil that can power neon tubes and X-ray tubes(not a good idea) Ed |
11th Jan 2019, 11:21 pm | #22 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
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Re: Old books/magazines and the gems within
Which Campus? There's 10 of them and I haven't been able to dig it up unfortunately.
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12th Jan 2019, 12:45 am | #23 |
Dekatron
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Re: Old books/magazines and the gems within
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12th Jan 2019, 10:07 am | #24 | |
Heptode
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Re: Old books/magazines and the gems within
Quote:
I bought a couple ( quite cheaply ) and used them in my subsequent construction project. They were completely satisfactory.
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12th Jan 2019, 11:25 am | #25 | |
Nonode
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Re: Old books/magazines and the gems within
Quote:
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20th Jan 2019, 6:20 pm | #26 |
Heptode
Join Date: Jul 2010
Location: Wellington, New Zealand.
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Re: Old books/magazines and the gems within
Those Victorian Boys books were classics for this sort of thing - instructions on have to make a bichromate battery, leyden jars which are even great fun for adults nowadays. Mind you the downside was things like sports where it was suggested in one of my favourite volumes that advanced javelin throwing could be practised by throwing at one another 'but you are advised to call out to your fellow before doing so to avoid accidents'. Shooting of course (bow and arrow and shotgun) advised you 'never to shoot at a closed door lest some person emerge from it unexpectedly'.
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20th Jan 2019, 6:24 pm | #27 | |
Heptode
Join Date: Jul 2010
Location: Wellington, New Zealand.
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Re: Old books/magazines and the gems within
Quote:
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20th Jan 2019, 10:57 pm | #28 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
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Re: Old books/magazines and the gems within
Here's another item from the 1904 Model Engineer & Electrician: an observation on the skill of the Chinese and what was then considered to be the remote prospect of them becoming the workshop of the world ( left-hand column, middle section).
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27th Jan 2019, 10:38 am | #29 |
Heptode
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Re: Old books/magazines and the gems within
I am not sure to what the "it did" refers, but for the induction coils I made, I think the primary was wound in 20 or 22 SWG enamelled copper wire. This is about 1 mm in diameter and the resistance of the primary would be very low indeed. Probably the current would exceed the limit for your charger diodes.
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27th Jan 2019, 12:18 pm | #30 | |
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Re: Old books/magazines and the gems within
Quote:
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A digital radio is the latest thing, but a vintage wireless is forever.. |
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27th Jan 2019, 12:44 pm | #31 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
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Re: Old books/magazines and the gems within
Those among us that are on the Radioboard Forums* will have seen this (link to a photo, not the forum):-
****************/kgFsbgW Hand crafted telephones with everything made - including speakers and microphones - from scratch. The gentleman involved teaches school children in an after hours activity group this sort of thing. *The Radioboard Forums is mainly concerned with Crystal sets, regen radios and other associated home made items. |
29th Jan 2019, 1:46 am | #32 | ||
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Re: Old books/magazines and the gems within
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2nd Feb 2019, 5:37 pm | #33 | |||
Heptode
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Re: Old books/magazines and the gems within
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2nd Feb 2019, 7:45 pm | #34 |
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Re: Old books/magazines and the gems within
I do like the "Procure a quantity of"... lines in many '30's books.
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3rd Feb 2019, 1:33 am | #35 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,339
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Re: Old books/magazines and the gems within
Yes, has a sense of naughtiness about it.
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3rd Feb 2019, 1:14 pm | #36 |
Retired Dormant Member
Join Date: Nov 2011
Location: Nottingham, Notts. UK.
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Re: Old books/magazines and the gems within
I used to use an electrophorus (now there’s a really ancient bit of apparatus) to charge things,easily cobbled together with a few sticks of sealing wax melted to form a layer in a tobacco tin, could get a 2cm spark out of it. I’ve tried unsuccessfully to replicate this to show my grand kids,the electrophorus has been gone from physics lessons for at least 50 years.
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3rd Feb 2019, 3:38 pm | #37 |
Dekatron
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Re: Old books/magazines and the gems within
We didn't do the electrophorus when we covered electrostatics in my physics lessons at school circa 1960, but here is a description from a 1920's school physics text book. Never tried making one myself.
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3rd Feb 2019, 5:54 pm | #38 |
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Re: Old books/magazines and the gems within
Oh the electrophorus, a fun thing indeed (the Obtain a... bit too) a polyethylene chopping board works well, just tried it with a metal lidded glass jar, a 1/4 inch spark!
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4th Feb 2019, 5:12 pm | #39 |
Heptode
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Re: Old books/magazines and the gems within
I experimented with an electrophorus ( Southport Tech GCE A level studies 1955 - 1957 ).
I think the lecturer said that "influence machines" e.g. Wimshurst, effectively made continuous operations of the electrophorus cycle
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4th Feb 2019, 6:38 pm | #40 |
Dekatron
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Re: Old books/magazines and the gems within
As I understand it, an electrophorus is essentially a variable capacitor (!). You start by charging the capacitor (rubbing the insulator to charge it electrostatically then putting the metal plate above/on it and earthing it to charge that 'by induction'). Now you separate the plates. The capacitance goes down, the charge is constant (the charge can't go anywhere) so the voltage goes up. The energy stored also goes up, but you are not getting something for nothing as you have to do work against the electric field to separate the plates.
And yes, the Wimshurst machine uses a similar principle, the foil pieces on the disks are the capacitor plates. Getting back to the subject, there was a series of books called 'Fun with ....'. 'Fun with Electricity' certainly described the electrophorus, along with a number of battery/bulb/motor experiments. There was also 'Fun with Electronics' (or was it 'Fun with Radio'??) which contained some simple valve radio projects and 'Fun with HiFi' which included some valve amplifiers to build (I think the Mullard 3-3 is in there). |