What is it? Set 136

R.H. wrote:

#794 Edison voicewriter. Just saw one on mythbusters yesterday. 30's dictaphone. #795 A latch of some type? #796 RJ11 jack

lugs out, and then pull it to remove the thing you've pushed it into from some other thing into which it fits snuggly.

Hmm, having written that it's not much of a guess.

Actually, the "RJ" numbers are wiring patterns for specific applications, not the connectors. They are named *p*c, for the number of postions and the number of conductors.

That is the 4P4C wired as a four conductor handset cord. The one in picture 796 is the 4P4C, as used for handsets.

is a link to some common RJ numbers.

Correct answers so far:

794. Ediphone dictation machine

796. Telephone plug

797. Also don't know about the pocket knife.

I'm going to be away from my computer until sometime on Saturday, I'll post the answer page tomorrow night.

Rob

796: in its current configuration thats a "line cord" for a RJ-14 or RJ-25 jack. Better known as a telephone cord. Because it does NOT have only 2 wires it would not typically be used with an RJ-11 jack, though it could be. IF you only were interested in the "1st line" The wiring is inside to out. Meaning the inner two wires would be line 1 ( Red/green ) and the outer two would be "line 2" (yellow/black.). ORINGALLY yellow was a power line for the lighting circuitry on the "princess" style phones with the black providing the ground as the "dialtone" on a landline phone is -48vdc.

Troy

R.H. wrote:

Hmm ... the phone company (the originator of these, IIRC) uses RJ-48 for both of the wiring patterns on the identical connector for a feed from a T1 box on the side of the house to the DSU in the house. The only difference is the suffix which indicates the differing wiring pattern for the transmit and receive pairs. The one which I am using is RJ-48C. I forget what the other one was.

However -- the 8-pin connector involved is usually referred to as a RJ-45

I don't believe so. The one shown has the fatter side walls, producing a connector the same width as the 6-pin version. You can see the grooves which would accept the extra blades (and in this case, simply prevent damage to the wire pins in a 6-conductor jack).

The 4-pin used in the handsets (at least in the old ITT one in my hand at the moment) is narrower, and does not have the unused grooves outside the four in actual use.

But -- it does not show the RJ-13, and a Google search for that seems to be confused by someone who has been posting under the name "rj13".

Enjoy, DoN.

Hi, all

I've been lurking here for a bit, but haven't posted before. I don't know what 795 is, but I'm pretty sure they aren't printers quoins. I can't pretend to be a world-class expert on quoins, but I did spend three years working with old printing equipment at a historic restoration on Staten Island, and I've never seen this style of quoin before. Furthermore, they don't look to be well adapted for the purpose. First of all, quoins have to generate a _lot_ of force. The form is almost an inch thick of solid lead and is held in place entirely by the friction resulting from the force that the quoins exert at the edges. All the quoins I've ever seen are wedges with vertex angles on the order of ten degrees. This device seems to have vertex angles more like eighty degrees, meaning it's designed to quickly take up a relatively large amount of slack, but generates relatively little force. Second, this device appears to be designed to exert force between two surfaces that are significantly out of parallel. That wouldn't be an issue in a printing form. Third, with the actuating screw on the end like that, the device would be rather awkward to tighten in a chase. The quoins I've used have either been actuated by a key inserted from the top (the side, in the photo), or are driven in place with a mallet and "shooting stick."

I'm not 100% sure, but that isn't how I'd make a set of quoins if I were designing them.

--Dan

I'll bet you have a lot of DB9 connectors, too.

I was going to say I'll switch back in a few weeks when I reach set 140, but since the set numbers are meaningless anyway, I'll just skip ahead to CXL next week.

Rob

Why should he?

What on Earth for? Actual numbers are much more readable.

Nope. DB-25 yes, and 13W3 in the same shell, but the 9-pin ones which I have are DE-9 connectors.

I note that you do not respond to my comment about the difference between the handset connector and the more common one used for phone lines.

The data sheet for the crimp dies on my AMP crimper include (among others):

Part # Ident Description Dot ======================================== 853400-3 Green 4 POSN HANDSET 853400-8 Blue 4-5 POSN LINE

Which shows a different die set needed for the narrower connector used on the handset. (I don't have that particular die set, though I have the one for the 4-6 position one, and the 8-position one.

Enjoy, DoN.