Boston CPB/Chahy 38
Posted by: Groundspeak Regular Member Shorelander
N 42° 22.531 W 071° 03.616
19T E 330377 N 4693526
Quick Description: Boston City Planning Board disk Chahy No. 38 - not station Chahy, but part of the transfer triangle for it.
Location: Massachusetts, United States
Date Posted: 4/4/2006 9:45:29 PM
Waymark Code: WM9XN
Published By: Groundspeak Regular Member seventhings
Views: 31

Long Description:

This mark is part of a First-Order Triangulation network set up for the City of Boston by the WPA from 1935-1941. Information on the location was found in Report on a Geodetic Survey for Boston, 1935-1941 (WPA Project Numbers 65-14-5744, 665-14-3-952, 165-1-14-259), published Nov. 1942.

The network consisted of 65 stations spread throughout Boston, spilling into neighboring municipalities. Many of the stations had local transfer triangles, consisting of one or more disks - this disk is not one of the 65 stations, but a transfer point.

The disk is a transfer point for the station CHAHY. Station CHAHY, if it still exists, sits atop the Schoolhouse on Monument Square condominiums (30 Monument Square; at the time, Charlestown High School).

The aforementioned publication has this to say about the transfer point itself on page 51:

"Ground Transfer Point, 'Chahy', CPB Disc No. 38 - (First order traverse No. B1/0)
Description: This point is a C. P. B. disc set in curb on east side of Monument Square directly in line with fence on south side of Monument Square near Winthrop Street."

The text gives specific measurements, but the area has changed some since 1938, so I will give new measurements. The disk is 70" from a gas cover and 100" from the end of a gray concrete wall.

Table II (p. 176) of the book gives the Massachusetts State Lambert Projection Coordinates (based on the C&GS adjustment, 1941) of this station as (718688.08, 501500.2756).

Condition: Mark found in good condition

Designation: CHAHY TR38 B1/0

Benchmark Agency: Not listed

Monumentation type: TRAVERSE STATION Disk

County: Suffolk

USGS 7.5' Topographic Quadrangle Name (optional): Boston North

Find type: Found by luck/skill/knowledge

Benchmark Agency (if other): Not listed

Monumentation type (if other): Not listed

Special category (optional): Not listed

Special Category (if other): Not listed

Web address of this benchmark's datasheet (optional): Not listed

NGS PID: Not listed

Local database's URL (optional): Not listed

Visit Instructions:
  1. A closeup photo of the mark taken by you is required.
  2. A 'distant' photo including the mark in the view is highly recommended. Include the compass direction you faced when you took the picture.
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Recent Visits/Logs:
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skaven visited Boston CPB/Chahy 38 5/2/2006 skaven visited it
Shorelander visited Boston CPB/Chahy 38 4/2/2006 Shorelander visited it

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