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How Large Are Tolerances ??

 
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Valued Member

Denmark
9 Posts
Posted 01/04/2019   11:32 am  Show Profile Bookmark this topic Add teddystamper to your friends list Get a Link to this Message
Hi there, and a happy new year to all. :-)

As a newbie I struggle with the tolerances of measurements. Are these two PCs the same (061)?

Right side: 13 mm between lines - 2 mm letters - 14 mm town
Left side: 12 3/4 mm between lines - 2 mm letters, boldish - 16 mm town

Neither is mentioned in PSS catalog as far as I can see, and they don't fit with special Philadelphia PCs...

Please can anyone help?
Thanks in advance
Lars




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Rest in Peace
United States
1189 Posts
Posted 01/04/2019   6:02 pm  Show Profile Bookmark this reply Add Stampman2002 to your friends list  Get a Link to this Reply
I had a conversation about this with the folks in the Precancel Stamp Society and there is a good deal of tolerance for dimensions between bars/bar thicknesses on precancels, especially with the vinyl precancel devices.

It depends on the pressure used and how constant it was. It also depends upon how worn the device is. There are several variables which factor into the spacing issues.

The guides in the PSS catalogs are just that. It's pretty much a matter of Occam's Razor. When all else has been eliminated, what is left must be the answer.

Hope this helps and good luck with precancel collecting. I love it!
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Posted 01/04/2019   6:18 pm  Show Profile Bookmark this reply Add rod222 to your friends list  Get a Link to this Reply

Quote:
Occam's Razor.

I recall researching that unusual phrase when viewing the TV Medical series "House"

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Posted 01/04/2019   6:23 pm  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
The most likely explanation is usually the correct explanation... but I am pretty sure that I just found four #596s.

Don
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Posted 01/04/2019   6:29 pm  Show Profile Bookmark this reply Add chasa to your friends list  Get a Link to this Reply
there is also L-22 and L-59 as possibilities, also the bureau coil mats are different from the sheet stamps
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Posted 01/04/2019   7:03 pm  Show Profile Bookmark this reply Add dkabq8 to your friends list  Get a Link to this Reply
FWIW, I think you are channeling Sherlock Holmes rather than William of Occam. Occam's razor is the problem-solving principle that essentially states that simpler solutions are more likely to be correct than complex ones.
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Edited by dkabq8 - 01/04/2019 7:05 pm
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Posted 01/04/2019   10:23 pm  Show Profile Bookmark this reply Add Stampman2002 to your friends list  Get a Link to this Reply
Gotcha! I just knew everyone would have some fun with the Occam's Razor misuse.

Hope everyone got a laugh out of it today.
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Posted 01/05/2019   09:15 am  Show Profile Bookmark this reply Add Louise411 to your friends list  Get a Link to this Reply
It is also called; Grab the first one you can and get home in time for dinner. Occam was wrong but it is human nature and has gotten a lot of people who are innocent in trouble. Now, I have read all the Holmes "Cannon" but he was wrong to. You cannot eliminate all possibility's.
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Edited by Louise411 - 01/05/2019 09:16 am
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Posted 01/05/2019   09:40 am  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply

Quote:
...Occam was wrong...

Occam's razor is the underlying principal for all scientific modelling and theory.

If you come home and find a bunch of trees knocked down in your backyard. It could be that aliens landed in your backyard and knocked them over. This is possibility. Or it could be that a thunderstorm blew through and knocked them down. This is also a possibility. But the odds are not 50/50 for either possibility; one explanation is much more likely.

Occam's razor principal is that the more likely explanation is the way to bet.
Don
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United States
10 Posts
Posted 01/05/2019   7:49 pm  Show Profile Bookmark this reply Add mattstef to your friends list  Get a Link to this Reply
At the top of page 4 of the PSS Town & Type catalog, it notes:
"...dimensions are approximate. However, vertical spacings vary, especially on Style 63 and between plates made for sheet stamps and coils."
There's a little more info in the PSS Bureau catalog, starting on page xxiii under "A NOTE ON THE ILLUSTRATIONS".

So yes, they both are style 61. Just from two different printings.
Hope that helps.
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Rest in Peace
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Posted 01/05/2019   9:09 pm  Show Profile Bookmark this reply Add Stampman2002 to your friends list  Get a Link to this Reply
mattstef.

Good to see you on the forum!
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United States
10 Posts
Posted 01/07/2019   04:01 am  Show Profile Bookmark this reply Add mattstef to your friends list  Get a Link to this Reply
Thanks for the nice welcome! Hopefully I can be of some help with US precancel questions. I'll try to keep an eye out for them.
Is there a way to set up notifications for when new threads come up in this section? I'm new at this...
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Valued Member
Denmark
9 Posts
Posted 01/07/2019   06:42 am  Show Profile Bookmark this reply Add teddystamper to your friends list  Get a Link to this Reply
Hi Matt
See you found the post.

I can't see how this explains the widening of the town and the bold type.

Anyhow, I shall try to read PSS-T&T again.


Thanks for joining
:-) lars
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United States
10 Posts
Posted 01/10/2019   05:47 am  Show Profile Bookmark this reply Add mattstef to your friends list  Get a Link to this Reply
Lars -
I think you'll find the explanation in the Bureau catalog introduction. There's a good description of the difference between handset type and machine set type. Your two stamps are a good example of the difference there. While there are a few minor differences, the two types are similar enough that we group them as one for PSS identification. Plus, they were sometimes used in conjunction; the upper half of the pane with one, and the lower half with the other. See ebay item #283329746344 for a nice example of this...
Best,
Matt
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