yeah, we don't know... that's plausible but there's no time information given for proper timeline evaluation...

(Written on 2017/06/16)(Permalink)

so the outside crew doesn't count? like those in that van that eased by pretty slowly??

(Written on 2017/06/16)(Permalink)

:) O:) :)

(Written on 2017/03/31)(Permalink)

one of three, maybe? :wink: :wink: :wink:

(Written on 2017/03/31)(Permalink)

ahh! i found it... atlas obscura is where i saw it noted as 16x16 but you made me go hunting again and i did find the 17th column one mile further east and another row one mile further north so i had to renumber everything but i do have a KMZ file from google earth if anyone is interested in it... i've found 144 markers, i think... the rest are just not visible at this time... either (re)moved or covered by sand...

(Written on 2016/10/26)(Permalink)

well, how about that... you are right! i just went back and read it again... i have spent the last half hour trying to find, again, the references i used that told me the grid was 16 x 16... it is apparently 17 x 17 which means i have another row and column to try to find... as for determining the NW origin, once i found one of the Maltese Xes, i kept going west until i found no more... then i went north until i found no more... eventually the NW corner basically showed itself to me... but i'm also wondering if maybe i have actually found the NW corner but it is not an X... slightly offset of where the X would be, is two long pads like a vertical equals sign but a bit larger... i'd love to find the map that they used in the article to determine what and where the markers were... i just started the project after reading the article and others related to it... it is funny, in a way, because i was out that way back in the '80s and could have actually walked to them at that time...

(Written on 2016/10/26)(Permalink)

where did you get 273? my understanding is that the grid is 16x16 which is 256... FWIW: i've found and marked 135 of them in my Google Earth installation... i started my grid in the north west with each row being letters and each column being numbers... of the A row, which is beside the Gila Bend Hwy, i found only one remaining marker (A3)... none at all of the B row... farmland and the population area of Casa Grande took out most of those rows... Arizona City took out a large section of G8 through L16 in that particular grid box... plus there's a canal or two that took out several when it was put in... i still go back and look for more of these markers from time to time... unfortunately the google earth imagery only goes back to 1 May 1996 so any that were still there before then are just not available in the imagery to be marked... they are all on 1 mile placements, though... that's easy enough to see... the real trick is to figure out which corner of the intersection they are o

(Written on 2016/10/25)(Permalink)

FWIW: here's a few links to these very similar markers... http://sometimes-interesting.com/2013/12/04/concrete-arrows-and-the-u-s-airmail-beacon-system/ https://en.wikipedia.org/wiki/Transcontinental_Airway_System https://en.wikipedia.org/wiki/Airway_beacon http://www.dreamsmithphotos.com/arrow/arrows.html

(Written on 2016/10/14)(Permalink)

they should go find the airmail route markers and do a story on them, too...

(Written on 2016/10/14)(Permalink)