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Details for Benchmark: MZ1807

N 42° 14.511 W 072° 38.893 (NAD 83)

Altitude: 1200

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In HAMPDEN county, MA View Original Datasheet
Designation:
MOUNT TOM BORDEN
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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We stood on the spot where this benchmark is buried, based on the photos in the logs below. Perhaps someday I'll come up here with a shovel, but today was not the day.

Found station in good condition with Papa Bear.

[Photos:]
photoStation MZ1807
photoAnother of station

Dave (ddnutzy) and myself were up on Mount Tom on Sunday and after recovering that station and most of the RMs, we set about finding this one. This mark is 18" underground and until recently a building was on top of it. But a few years ago, the nearby air beacon tower and the equipment building which stood over this station were removed and so we had a chance.

We took the distances from reference points given in the 1896 and the 1934 recovery logs. After repeated measurements and digging for about an hour, we hit bedrock and found a depression in the bedrock. Dave cleared it out and said "I see a copper bolt with a cross on top"

We found it! We checked the measurements and it was right on from the two early descriptions. The photos were difficult to get since the bolt was way down in the hole and we continually knocked dirt and gravel down on top of it. But we got a few good shots and Dave also put some photos of the bolt in his [url=http://www.geocaching.com/mark/details.aspx?PID=MZ1808]log for MZ1808[/url].

I put a diagram out giving the ties to the other marks.

[b]Please note:[/b] the 1896 log gives the distance between this station and MZ1808 (MOUNT TOM) in both meters (3.5195) and feet (11.783). The metric distance is correct, but the feet were incorrectly calculated. It should be 11.547 feet. Disregard the number given for feet and use the metric distance if you are looking for this station.

We believe we are the first to recover this since 1934, and therefore we are very likely to be the only two folks alive to have seen it.

[b]Note: if you recover any mark which is buried underground such as this one, [u]always fill in the hole you dug when you are done[/u]. This is to protect the mark from vandals and for the safety of those walking around the area.[/b]

[This entry was edited by Papa-Bear-NYC on Saturday, April 26, 2008 at 4:43:45 PM.]

[Photos:]
photoMZ1807 Mount Tom Borden
This show the hole, and as you can see, you can't see much down there. It was about 18" deep and about 5" wide at the bottom where we hit bedrock.
photoMZ1807 Mount Tom Borden
This composite shows the same hole and a shot of the copper bolt blown up. The shot of the bolt was taken with the camera down in the hole. The bolt appears to be 1/2 inch in diameter,
photoMZ1807 Mount Tom Borden
Shot of the bolt from within the hole, flash on.
photoMZ1807 Mount Tom Borden
Shot with flash off. The lightness had to be greatly increased producing a somewhat grainy image. The colors are more true to life than the shot with the flash.
photoMZ1807 Mount Tom Borden
Area shot showing MZ1808 and the approximate location of this station.
photoMZ1807 Mount Tom Borden
Site diagram showing the relative location of this stations to MZ1808 and 2 Reference Marks which were used to locate this station.
photoMZ1807 Mount Tom Borden, vintage documentation
Description of this station from the USCGS Special Publication No. 76 (1922).

Mark has been relocated, see arrow.

Found the hole where the marker used to be as indicated in previous log entries. Too bad that the original markers have been removed.

Here is another picture of the before photographed marking. I suspect this is another reference marking. I suspect the NNW one. Note the arrow next to it.

[Photos:]
photoReference marker? I think so.

I concur with BletchleyPark's observation of 23 Aug 2002 that this benchmark is not found and may be lost.

The photos indicated by Jestjuggle (22 Nov 2003) and Gandalf (27 Apr 2003) may actually be one of the reference marks for the station Mount Tom MZ1808. Here's an excerpt from the MZ1808 description:

1/1/1901 by CGS (SEE DESCRIPTION)
FOUR REFERENCE MARKS, DRILL HOLES IN ROCK,
WITH SQUARES AROUND THEM WITH ARROWS POINTING
TOWARD THE STATION, ARE LOCATED, RESPECTFULLY,
19.21 METERS (63.02 FEET) SW.
6.53 METERS (21.42 FEET) NNW.
6.90 METERS (22.64 FEET) ENE. AND
6.15 METERS (20.18 FEET) SE
OF THE STATION.

In 1960 a reference disk was cemented in the NNW reference hole. In 1965 it was noted that many disks had been removed; there was no mention as to which ones. I photographed a similar station to Jestjuggle and Gandalf's fotos that was located to the northwest of the structure now used to house radio equipment for the antennas on the airway beacon tower.

Measurements based off of station Mt. Tom likely places this benchmark under the aforementioned concrete radio building located immediately west of MZ1808 Mt. Tom. If anyone has any luck in actually finding this one please email me - I'd like to see it.

Beautiful day up on Mt. Tom. Perfect Blue skies, temp about 60 and no wind.
Jetjuggle (Mike & Barb)

[Photos:]
photoMZ1807

I believe I have found this one. See the attached photo.
Coordinates on the GPS N42 14.512 W072 38.894

[last edit: 4/28/2003 4:05:19 PM PST]

[Photos:]
photoBenchmark MZ1807

Spent a day up on Mt. Tom and looking for this benchmark as well as others. A structure now stands over its location. Combine that with the depth at which the benchmark is located and you have a major excavation project!

BP

Documented History (by the NGS)

01/01/1835 by CGS (MONUMENTED)
01/01/1896 by CGS (SEE DESCRIPTION)
DESCRIBED BY COAST AND GEODETIC SURVEY 1896 THIS STATION IS 3.5195 METERS (11.783 FEET) TO THE WESTWARD OF STATION MOUNT TOM. IN 1885 THE MARK, A COPPER BOLT WITH A CROSS IN THE HEAD WAS FOUND 22 INCHES BELOW THE SURFACE OF THE GROUND, SET IN THE SOLID ROCK AND COVERED OVER WITH A MIXTURE OF EARTH AND CHARCOAL TO THE GROUND LEVEL. BEFORE REFILLING THE HOLE A STONE WALL ABOUT 18 INCHES INTERIOR RADIUS WAS BUILT AROUND THE POINT, AND OVER THIS A FLAT ROCK WAS PLACED AND THE WHOLE THEN COVERED WITH EARTH TO THE GENERAL GROUND LEVEL.
01/01/1934 by MAGS (SEE DESCRIPTION)
RECOVERY NOTE BY MASSACHUSETTS GEODETIC SURVEY 1934 THE STATION WAS FOUND IN GOOD CONDITION AS DESCRIBED WITH THE FOLLOWING CORRECTIONS AND ADDITIONS--(1) THE MARK, WAS FOUND ABOUT 18 INCHES BELOW THE SURFACE OF THE GROUND. THE REMAINS OF THE CIRCULAR STONE WALL AND FLAT STONE WERE FOUND, THE SPACE OVER THE MARK BEING FILLED WITH A MIXTURE OF EARTH AND CRUSHED STONE. (2) THE STATION IS LOCATED 11.5 FEET NE OF THE WESTERNMOST CORNER OF THE NEW BUILDING AND 5.1 FEET FROM ITS NW SIDE. (3) IT IS ALSO 57.9 FEET NE OF REFERENCE MARK NO. 1 FOR STATION MOUNT TOM.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in June 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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