Trying To Understand Pairs.

What would this be? Line pair,guide pair or coil pair.Thanks for any inputs provided.

line pair. Are they a coil?

Thank you for the reply I Love Stamps. How do you determine a coil. Still learning.Thanks.

Yep it is coil.

You can tell it's a coil if it/they have two non-touching straight edges (top & bottom or Left & right), unlike a corner margin single, or a booklet corner single that both have 2 straight edges that are touching.

I could scan some examples if you wish?

Also, if there is a guide line between two stamps, coil or regular stamps, it is called a line pair and very collectable. Do not ever separate them.


Edited to re-word it correctly

Would really appreciate some guidance on how to identify the difference between coil line pair,guide line pair and joint line pair.Scans of these examples would really be helpful. Thanks alot.

"a guide line between two stamps, coil or regular stamps, it is called a line pair..."

True, but I would distinguish between guide lines on [flat plate printing] regular stamps, and reserve the term "line pair" for coils only.

A good example is #753 in the Scott Specialized, where the presence of a guide line (Scott's terminology) is the only way to tell #753 and #733 apart.

Selva,

The glossary of terms for collectors of U.S. stamps may be help to you.

http://glossary.usstamps.org/

Steve

The 2 types of coil line pairs are the guide line and joint line.

The guide line pairs are from flat plate printings. The flat plate coils were normally printed from the same plates that were used for the sheet stamps. These plates were 400 subjects with vertical and horizontal guide lines. These guidelines were to assist in the cutting of the sheets into panes of 100 for post office distribution.

The flat plate coils were made by cutting the sheets into 20 strips of 20 stamps each. The strips were paste together to make the coils. These coils would have a guide line every 20 stamps (and also a paste-up every 20 stamps)

An example of a flat plate sheet is shown below showing the guide lines.



Joint lines were from the rotary press coils. They were made by the ink that was captured in the gap between the 2 plates. The rotary press used curved semi-circular plate and a continuous web of paper so there was no need for paste-ups.

The early rotary press used 2 types of plates; 150 subject for horizntally perforated and 170 subject for vertically perforated.
Examples are shown below


170 subject


150 subject

The plates were made flat and the proofs verified. The plates were then rolled into the curved shape, trimmed and mounted on the rotary drum.

The pic below show plates being fitted. The area that is being worked on is the joint fit up area.


Below is the rotary press. The rotary drub with the plates can be seen with the paper web going around abou 3/4 of the drum.



I hope this helps.

Nice info, Russ.

Great photos russ. Can't believe the plate drum was done outside the press. When I ran a big webb press all plates were added to the units 1 at a time . There was a slot to insert the lip of the plate then you would "jog" the press forward until you reached the back end of the plate and tighten. Very dangerous if you hit the button a bit to much destroying the plate or worse getting a finger caught. Had 1 prson loose a bunch of skin but was smart enough to rip his hand out. Another time a small open end wrench was dropped into the folding area and it did not stop the press but left a full clear impression of the wrench on the roller. Working inside printing presses is a scary place but awesome at the same time. Unfortunate that so much has gone computerized and these machines are scrapped all the time.

Thank you Russ. Helped a lot.

NITROLURES sounds like a HARRIS unit.