[chbot] Choc Fish Challenge #5

[Cass Jones]

I work out 2km:

At the first end (end A) you connect all the wires together in pairs,
leaving 2 unpaired as single conductors, then you attach the negative
lead to one of the single wires and the positive to one of the pairs.
label the negative wire as 4 and the other unpaired wire as 1, you
then walk to the other end (end B). (1km so far)

Now at end B you try all the wires with the bulb untill you find the
three live wires, you should be able to determine the positive end
from the negative by there being two positive wires and only one
negative, label the negative wire 4,

Now connect the negative wire to one of the other wires that isn't
positive, you should be able to find which wire its paired with at end
A by another wire in the group becoming negative, label the wire you
connected to the negative as 5 and the lead the becomes negative as 6

The only wire this wont work for is the unpaired wire you labeled at
the other end that wasn't negative. when you find this wire label it
as 1 to match the other end and connect it to one of the positive
wires, label the two positive wires, label the one connected to wire 1
as 2 and the other one as 3.

Leaving each connection in place repeat that process of finding the
pairs using the new negative lead until all of the wires are connected
in series except the three now positive leads (1, 2 and 3). label each
new wire you connect as one higher than the last newly found negative
wire you labeled and each new negative you find as one higher than
that, such that the wires are connected in order, 4 is connected to 5
is connected to 6 is connected to 7 etc until all 120 are labeled at
end B.

Walk back to the end A (now having walked 2km)
Now we can determine the order of the positive leads by disconnecting
2 and 3 from each other and the positive terminal then by connecting
the positive terminal to each of them in turn until you find which is
connected to 1. label that wire as 2 and the other as 3. We can forget
about these three wires now.

Now hooking up one side of the tester bulb straight to the positive
terminal of the battery and leaving the negative terminal attached to
the original negative wire, 4, disconnect one pair at a time,
reconnecting it before trying the next pair, until you find the pair
that when you disconnect it, it leaves all the other pairs connected
to the negative terminal. (you'll need some exposed conductor where
you've bridged wires to test against). You can now label those two
wires you have just disconnected, one will still be negative and the
other wont, the one that isn't negative is wire 120, and the one that
is still negative is 119.

Now leaving the newly labeled pair disconnected, repeat this process
untill you've found the next pair that leaves the all the pairs still
connected to negative, disconnect that pair and label accordingly, one
less than the last pair, with the wire that is still connected to
negative as the lower number of the two.

Repeat the whole process untill you've labelled all of the wires.

On Mon, Sep 5, 2011 at 9:41 AM, jimmy allen <jimmy1248 at gmail.com> wrote:
> Hello
>
> I am say approx 8 km
>
> Here is some rough maths
>
> d = 2 l Ln x
>
> where
> d is total distance traveled
> l  - 1Km
> Ln - natural log
> x - number of wires
>
> I say approx 10Km for 300 wires
>
> Jimmy
>
> On 9/5/11, m.beckett at amuri.net <m.beckett at amuri.net> wrote:
>> Gents
>> We have had a hack at this at work.
>> We work out 4km required to label both ends.
>>
>> If you want the jumpering undone so they become individual, it needs a
>> 5th km.
>>
>> We can explain how, but its a long email, and the phones keep ringing.
>>
>>
>> Mark
>>
>>
>> On Sun, 4 Sep 2011 21:55:00 +1200, Synco Reynders wrote:
>>> Hi Mike,
>>> I see you're a fit (or going to be a fit) guy after doing this... Cos
>>> the next job your the boss has is a 300 wire cable <very subtle hint>
>>> :-).
>>> Nice try, but you may need a bit more optimisation.
>>> /s
>>>
>>> On 4 September 2011 21:44, Michael Field <hamster at snap.net.nz> wrote:
>>>> I've made a start.... this is flawed (at the end of step 2 we
>>>> haven't
>>>> definitively identified the bundles at the far end) but might
>>>> inspire
>>>> somebody. My guess is that you need to use uneven wire counts in
>>>> each bundle
>>>> you can glean more information....
>>>>
>>>> But I'm pretty sure that the divide into three groups and wiring up
>>>> two is
>>>> the correct starting point...
>>>>
>>>> Mike
>>>>
>>>> First step
>>>> Separate the cables into 3 bundles of 40, short all cables in the
>>>> bundle
>>>> together Connect each end of the battery terminals to one bundle of
>>>> 40
>>>> (leaving one bundle unconnected).
>>>>
>>>> Walk to the other end.
>>>>
>>>> Connect light to a random wire, and try to get a circuit by
>>>> connecting to
>>>> each of the other wires. If nothing lights, try another wire.
>>>>
>>>> When you get a light, you will then be able to move one jumper
>>>> around to
>>>> find which 39 other wires are also in that bundle. Do the same with
>>>> the
>>>> other terminal of the bulb.
>>>>
>>>> You will then have three bundles of 40. One you will be know more
>>>> about
>>>> (it's not connected at the other end) but you won't know which
>>>> bundle is
>>>> connected to the positive terminal, and which is to the negative (oh
>>>> for an
>>>> LED or meter).
>>>>
>>>> Second step
>>>> For each bundle of 40, divide it into two sets of 20, and jumper
>>>> together.
>>>> Jumper two bundles of 20 from one of those connected to one of the
>>>> battery
>>>> terminals together, jumper each bundle of 20 from the unconnected
>>>> pair to a
>>>> bundle of 20 that is connected to the battery.
>>>>
>>>> Walk back to the other end
>>>>
>>>> Use the bulb in series with the battery to separate the starting end
>>>> into 6
>>>> bundles of 20.  you will also be able to work out which bundle was
>>>> connected
>>>> to which battery terminal, accurately identifying both ends of the
>>>> bundle.
>>>>
>>>> Label each cable.
>>>>
>>>> Step 3 & 4
>>>> Deal out the cables again 3 or 4 from each bundle of 20, into new
>>>> bundles of
>>>> 40. Repeat. The above process, walking another two trips
>>>> This will allow you to divide the cables into 36 bundles of three or
>>>> four.
>>>>
>>>> Step 5 & 6
>>>> Deal out the cables again bundles of 3 or for , into new bundles of
>>>> 40.
>>>> Repeat. The above process, walking another two trips
>>>> This will allow you to identify individual cables.
>>>>
>>>>
>>>> On 4/09/2011 7:48 p.m., Synco Reynders wrote:
>>>>
>>>> As I was pulling through some wires today I remembered this classic
>>>> challenge...
>>>>
>>>> A 120 wire cable has been laid firmly underground between two
>>>> telephone exchanges located 1km apart.
>>>> After the cable was laid it was discovered the individual wires are
>>>> not labeled. There is no visual way of knowing which wire is which
>>>> and
>>>> thus connections at either end is not immediately possible.
>>>> As trainee technician your boss has asked you to sort it out and
>>>> identify / label the wires at both ends. You only have a battery and
>>>> light bulb to test continuity and tape/pen for labeling the wires.
>>>>
>>>> What is the shortest distance in kilometers you will need to walk to
>>>> correctly identify and label each wire?
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>
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>>
>>
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>> Ave, 6.30pm
>>
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>
> _______________________________________________
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>
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