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here's something that you might not have seen before this is a linesman's telephone now in the US this would be known as a lineman's telephone the reason I mentioned that it's because you might have heard the Glen Campbell song Wichita Lineman it's about a guy using what are these because he is the chap that would climb up a telephone pole with one of these and plug it in to test the line and that's what this device is for there I'll just open it up so you can have a look at it you can see I've got a camera up here hopefully that sort of does a close-up at the same time if not I'll just cut the footage in but you can see inside here hopefully well actually first thing I'll do I'll get this piece of paper out because I bought this online from eBay as usual and it said ex-military devices but although of course generally they weren't military items it's just that say I've come across this well these would have been used by the telephone company to test the lines but this one is ex RAF Leuchars in five fits certain it's an Andrews golf course just to the side of the river but that base there Lucas they change from the RAF to the Army swapped over probably around about the time they got rid of this so I think this is X RAF but you know it could be a Barbie as well they've they brought it with them realize I didn't want to because it's dates back to 2014 this looks like something from World War two dancer but that's when they decommissioned it so this is from eBay via the Army Air Force the idea with this is you've got your telephone receiver here you've got your dialer here and what you will do I think I've got a cable there we go at least I think this is what you do not that I've ever done it you climb up a telephone pole plug in your crocodile clips click them onto the line and then you could ring back to the base here to the operator or whatever and say is the live working they could maybe say you were outside a house and someone says there's something wrong with the line when you go and test it see if you could connect through to the exchanger then back to the to the location etc it's basically just to tell if but one that you can very easily plug into an existing set of lines now the military have their own team of linesman whose job it is to maintain their infrastructure whether it's electricity lines or phone lines so they would use something like this so when I think about it's probably more likely that this has come from the Army that the Air Force he was just being stored at an Air Force Base now this particular wall costs me about 30 pounds and I've got to say the caisson it looks like it's metal isn't it's plastic if that's a little bit of a crack up here on this one and it looks oh I mentioned like something from the Second World War perhaps or just after but it isn't this is from I think 1979 or later because I found the instructions online for this particular model which is a PI T mc1 705 and those are dated to 1979 so more than likely is from the 1980s or maybe even the nineties the reason that I got this it's an interesting looking device kind of thing that you could perhaps have in a man cave or just of a shared or just on display not really the kind of thing you want so much just in a normal house but you could with an adapter connect one of these up to a normal phone line and use it as a telephone just a standard so I've got the dialer here we've got those little bits here where the phone hangs up on and there's also on this one push-to-talk button just because of the way that they were using these that hold this down and just check there was edible on the line and well maybe don't hold it down then hold it down if there was no one on the line so you could talk so they could actually just not listen in on the phone calls which I think it's part of the Glen Campbell song but I'm not all that familiar with it now what I will show you here what of course we've got the receiver as we can see we've got the bits I connected the crocodile clip to before there is a headphone or earphone output there and then there's another couple of Clips there I think there might be for an external battery I'm not too sure and then we've got a switch here that says CB lb and ring of course ring you would slide into that position and it ring the other end of the line lb is like local battery might not stand for now but that's why that's so she ate it with because in this machine you can insert 3d cell batteries in the end because of course you need some power to be able to make a phone ring at the other end so you need to I mean there is power on the lines but that's where the CB comes from that's a spur central battery that's with the power on the line so what this means is that this device can power the connection so what makes this what makes this interesting isn't when you've just got one of these it's when you've got two of them because with two of these you can then create your own retro intercom no I know people would say well why don't you just use a mobile phone to talk to someone and then you could had it would be a lot easier and cheaper but they see just a bit of fun that's all the idea with this is I was thinking that somebody could have one of these in a shed down the bottom the garden at a workshop of manga Kay whatever you call them out there the person in the herrings could say ring them up and say oh you tea's ready in five minutes or somebody at the door or whatever those kind of things just like you got a shout down there you know to the other end of the garden but with this do it through one of these so what you do is you connect two of these together using those connectors I mentioned before there are just have a look at the document than this because this is another one this dates back to 2010 prepared for movement off station so yeah all this that's sergeant Miller it looks like did that so yeah I'm just going to take the cover off one of these and do a bit of a closer just to show you what the inside of this looks like and then I'll come back and what I'll do is I've got some Bell wire here and I'm just going to connect it between the terminals on both of these and just show you how that works so let's have a look at that in a second so of course with this not being a consumer device instead it's something that would be used solely by engineers it's designed to be easy to take apart and also everything in here is laid out nice and neatly so that Eddy can opponents that were not functioning properly could be swapped out relatively simply this is a dial and of course rotary dial is always fascinate me the way that they work so for those that don't know you turn it around to the number that you require and then the little plastic peg flips over and taps pulses out on the metal connector on the left-hand side so let's just have a look at that again it'll flip over and then tap it out that'll be like a finger tapping Morse code because it sends those pulses then down the line you have to send regular pulses so on the right hand side through that hole where you'll see a regulator which keeps those pulses spaced out evenly does that by sort of like having a little fan on it although so that it can't go too fast with just the same speed every time as far as the ringer goes well it's this thing here is this metal bar on these electromagnets and when the pulse is sent down from the other end that vibrates and creates a noise it hits up against that metal pole on the right side lane bar just better make out that it's moving and then if this one wants to ring the other end wants a matter of pushing the switch into the appropriate position which then does the same thing by sending the pulses down to the ringer unit on the other end Oh quite rudimentary but it works so the design remained unchanged for decades right okay I've got the wired up now very simple just put a piece of wire between them and of course make the wire whatever length you want I suppose within reason but Jacob that's things 25 meters of something of why they're so yeah by moving it into the ring position say ringing it's kinda like a kind of buzzing sound I'm wondering if the army versions of these had a different sound on them to a normal version that someone would use from a phone company because I mean you don't want the bell ring you know if you're trying to be discreet or maybe they all sound like this just don't know these are the ones I've got but yeah that rings up that rings up so that this person oops these lids are a little bit prone to fall and you could take the straps off I suppose but yes this person could be that person they pick it up and then by pressing this button I could talk to them now what I'll do is I'll just put my microphone over on that side so you can hear my audio coming through okay so I've just taped my microphone to the receiver now and I'll just pop this on the top and there hopefully you should be able to hear me through the telephone or through the receiver so yeah obviously telephone that's it really it's just the interesting idea having this as a as an intercom as a two-way system a kind of retro intercom I was obsessed with intercoms as a kid I used to set them up over the house there I'll just mention something about this CB and LB on here the local battery I believe if you leave it in the LB connection that will slowly wear the battery down even if you're not using it that's what I read on these online forums whether we're talking about these devices so if you were using this as a din skon to a shed or whatever when it wasn't in use you'd want to put it into that CB position which meant that the battery wasn't connected now the thing with out of course you have to remember to switch it back on again afterwards but that's the only thing that I think is a bit of a drawback to using one of these and if you were just to put batteries in one of these devices that one could then ring their other world and you could have a proper two-way conversation no problems but the one without the batteries was would be unable to ring the other device so the calls would really have to be initiated by the person with the batteries or unless you've just agreed to pick up the receiver at the exact same time or something yeah that's it really I'll put links to the place where I got these from in the video description text box on eBay I'll say they have plenty of these for sale it's just a fun little lights a little bit of a history and gotta say it's a long time since I used one of these rotary phones and takes you right back that color even back to the 1970s but anyway there you go hope you've enjoyed that one but that's it for the bowl burn as always thanks for watching [Music] [Music] [Music]