I wonder about using other "metal detectors" as I have found, cesium
magnetometer to be able to locate bricks below the ground (of course there
is interpretation) and other anomalies. I have seen graves (? McCrory, one
of General Washington's "lifeguards" [bodyguard]) in some cases, to
supplement the stones, a brick wall created connecting two or more stones,
that one had a tire burned in front of it) supplemented with brick perhaps
older walks could be found too. A similar technology.

An EPA sponsored testing of the former "city gasworks" in Saratoga Springs,
NY, on Excelsior Avenue, illustrates. The surviving brick gasholder was
recently put on the National Register of Historic Places, though the
exercise herein described took place over ten years ago. Located in an
electrical service storage and work office area, complete with active
natural gas line. The possible source point of "coal tar" seepage into the
water control sewer beneath was investigated as it drained into the nearby
lake. In the past, coal ore was "cooked" into coke and the gas produced was
used as "city gas" to light gas lights in dwellings and on streets. The
subsurface remains were mapped and corroborated with other research to
recreate a history of the industrial gas plant, now only represented by the
standing "gasholder," which is typically. a partly subterranean water
regulated floating iron gas storage tank pressure regulated within a brick
structure or metal framework, of which there were four or five types, two
identical brick ones once. Other related structures were investigated by
cesium magnetometer survey and the results depicted within transit data as
maps to establish where test excavations were to go and went to establish
what remained, in, by the way, record summer heat under HAZMAT protocols.

Hold a compass next to a brick wall...

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