Nautilus IIB vs Tejon

[U.K. Brian]

Eric Foster, Dave Johnson, John Gardiner and a few other of the top designers of today's metal detectors all agree that that a coin can be detected well beyond the width of the detectors coil.

With a four inch coil (U.S. coin) John Gardiner quotes six inches.

In my test bed today I could detect a U.S. quarter at twelve inches (good signal) with a 10" concentric coil. A T2 (Double D coil) which is around 7.5 inches wide could hit the same sized target at nine inches. This is not on good soil !

 

Amazon Forum Fav 👍

Family Maps of Hinds County, Mississippi, Deluxe Edition - Grab it through Amazon!

[Bradley137]

Reasonable thinking suggests that a quarter size object won't look like a quarter size object anymore to a detector after being buried for a hundred years. A.K.A. (The halo effect) So one must consider all variables before making any laws in the physics department and since this hobby has so many different ever changing conditions from ground minerals, ground moisture, electronic interference, halo effect, drifting that occurs when multiple targets are in close proximity to one another, I believe it's safe to say it's more difficult to apply a science of a controlled environment to the demanding conditions in the field. Hence every now and then even a blind squirrel gets a nut. Heeeee Heeeeee

 

[ArJuna]

Truly, no one believes a magnetic field is limited by the size of the object generating it. I have done simple experiments with metal filings on a sheet of paper and seen the tiniest neodymium magnets
generate fields way beyond their relative sizes. I have a very strong one in my hand that is 3/8" x 1/16" and it will lunge at a ferrous object nearly 2 inches away.

Also, the earth's magnetic field is known to extend at least 36,000 miles and is only 8,000 miles across.

 

[oldbill]

If I had the health I had years ago Nautilus detectors would be the only detectors I would use but old age has arrived! The Tejon was an awful detector in the ground I had to deal with! Bill