THANKS !!!!!!!!!!!!! My idea of "mount up-down the pole-pin" was not so wrong. But, evidently, i did an error in assembling parts. Now it works fine and soon i...
Hi, an eBay action for 1941 Morin Catalog is closing in few hours (# 180615810902) I asked seller, but she says that it dosn't contain any reference to ...
I have a Paragon Drafting Arm which I just recently purchased and I have tried to do some research on them without much luck. Mr. Rose has been very helpful...
I am not aware of any website devoted to this drafting machine. The Paragon drafting machine first appeared in the 1936 catalog. There was only one model which...
Ken, thank you very much. This allows to estimate when production started. Planimeter was not in 1920-21 catalog, it's listed in 1925-26 catalog. At the other...
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DrawingInstruments@ya...
Feb 4, 2011 10:17 am
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the DrawingInstruments group. File :...
I am always very impressed with the amount of knowledge that the members have here, and are always so happy to share. Recently I have even noticed that...
Hi, Proportional dividers are still made today and are I believe used by artists, for instance for scaling from photographs. I have quite a collection of...
I just uploaded a T. Jones protractor from the min 19th century. It's a nice piece 6 inches across and has a couple dings. My question is, the name "T March"...
Good evening, I just joined this group because I have a mystery measuring device, that I recently purchased on eBay. It is called a "Ratiometer", and the...
Think I found it. :) A "calculating apparatus". US pat. no. 2701096 issued Feb 1, 1955 to L. Wattier. My preferred service for downloading patents is...
... Good find! While not exactly the same at the Ratiometer, they're obviously very close cousins. I wonder which came first? Google Patents is also a very...
Hi Bill, Thank-you for the compliment. At the end of the patent I listed, there are several other patents referred to. Might be interesting to pull those and...
... I checked most of them, and the one you found was the closest to the Ratiometer. ... Google also delivers a single-file PDF, and the plain text option...
Wow! I want to thank you guys for steering me in a new direction. I had thought about patents, but did not know how to access such information. I will now...
Hi Ron, My approach from here would be to follow "Soil Conservation Services" (as in federal agency) It was formed in 1935 to deal with the soil erosion from...
The Mystery Measuring Device string seems to have triggered a discussion of patent searching, so I thought I'd throw this in: I've been doing research in early...
Pano, that GB patent from 1919, is similar to my mystery "Ratiometer", but of course lacks the two needle points, and mine is not made to lay flat on a...
You have a "prototypical" tool used in aerial photography, to properly align/ scale multiple aerial photos into a single large-format photo-mosaic. It (or...
Thank you Nathan, I also found that USIGS Glossary definition, I think you have accurately described its use. The SCS files appear as a vast morass of...
If you really want to know how it was used, I can dig up some photogrammetry manuals to show you similar devices being used- I doubt the SCS would have any...
Hi Ron, Another avenue you might want to try, would be your local 'county extension service' It's a USDA service usually handled by a state university. It...
Thanks again to all who responded. I have had other mystery items that I found over the years, one was that "double horned" device in the lower left side of my...
