Mark Gillespie

Is there anywhere on this site that has the research or post made from Reg Sniff pertaining to TDI depth in relation to battery voltage? I remember somewhere that stated the reason the original TDI had greater depth capabilities was the increased voltage of the batteries not necessarily the model number. It also had information in relations to voltage limits/performance issues. Just thought I'd ask.

Yes, you are correct, GB off is deeper and that is the option I take at the beach.

The 12" dual field is by far the deepest coil I've used on my TDI but the heaviest too. Amazingly the Super Pulse 350 and the 7 1/2 Dual field have about the same depth capabilities. If you don't mind digging deep holes at the beach the 12" is super. But more importantly is hunting areas where the sand is not more than 12" over top of the hard shell pan areas of the beach. Look for areas where the sand has washed out small gullies. If you're hunting in the very wet sand area where you actually start sinking while standing still, that might not be the best area especially if the hard pan area is 2' down (the heavy gold items will sink until they hit something to rest on). There is a lot to be said about these two areas. Hope to take my TDI back to the beach this year. Gold, here I come.

Have you done any air test with this coil? I know a lot might say that an air test gives a false impression, but it is a very good starting point for depth capabilities. I will say, I've found most TDI coils all get about the same air distance with the exception of the 12" dual field.

Awesome pieces of history.

Finally got to hunt an old home site yesterday evening. The elderly gentleman had given me permission to hunt all his property and he had kindly given me a little history of the different home site that were on the property. I listen intently to every word to obtain as much information as possible of each locations. One of the sites was a home assembled using wooden pegs. He proceeded to explain that he tore the home down and burned the balance then proceeded to get a dozer to grade the property and fill in with dirt. He did explain that anything there would be over a foot deep and he was correct, I couldn’t find anything that would date the property to the early 1800’s. The second site I hit yesterday and even though I didn’t find any nice relics I had a lot of fun just hunting. Moving around in the area I noticed a section where the Equinox would give many false high tones. Knowing this usually meant iron I opened up the screen and every sweep revealed multiply low tone iron signals. After a while I decided to start digging these low tones that gave an ID of -3 and found my answer, cut nails. Wow, that means I’m on an old site, yes, excitement overwhelmed me for a few minutes. Noticed the Ole man walking up the field to where I was I waited for his arrival. Knowing he would have more to say and the very first thing out of his mouth was, “have you dug any cut nails yet?” My answer, yes sir and handed him one and the story unfolds more detail of the site. He said when he was a child there was only a few foundation rocks left of this house, no wood but only the rock foundation. That was 80 years ago and he estimated the site may have been 200 years old. At that point I got extremely excited at what might be here until the very next statement from the gentleman. “Mark, I had the site leveled many years ago.” “But I pushed all the dirt to level the lot in one direction and I would guess your best bet of finding anything would be along the banks of the hill.” Well, yet another let down, a site dozed, that destroys the originality of where and what could have been found. But I’ll continue to hunt while I can and digging cuts nails is still fun. "Nails provide one of the best clues to help determine the age of historic buildings, especially those constructed during the nineteenth century, when nail-making technology advanced rapidly. Until the last decade of the 1700s and the early 1800s, hand-wrought nails typically fastened the sheathing and roof boards on building frames. These nails were made one by one by a blacksmith or nailor from square iron rod. After heating the rod in a forge, the nailor would hammer all four sides of the softened end to form a point. The pointed nail rod was reheated and cut off. Then the nail maker would insert the hot nail into a hole in a nail header or anvil and form a head with several glancing blows of the hammer. The most common shape was the rosehead; however, broad "butterfly" heads and narrow L-heads also were crafted. L-head nails were popular for finish work, trim boards, and flooring. Between the 1790s and the early 1800s, various machines were invented in the United States for making nails from bars of iron. The earliest machines sheared nails off the iron bar like a guillotine. The taper of the shank was produced by wiggling the bar from side to side with every stroke. These are known as type A cut nails. At first, the heads were typically made by hand as before, but soon separate mechanical nail heading machines were developed that pounded a head on the end of each nail. This type of nail was made until the 1820s. By the 1810s, however, a more effective design for a nail making machine was developed; it flipped the iron bar over after each stroke. With the cutter set at an angle, every nail was sheared off to a taper. With the resulting nails thus all oriented in the same direction, it became possible for the same machine to automatically grip each nail and form a head in a continuous mechanical operation. Nails made by this method are known as type B nails. Cutting the nails leaves a small burr along the edge as the metal is sheared. By carefully examining the edges for evidence of these burrs, it is possible to distinguish between the earlier type A nails and the later type B nails. Type A nails have burrs on the diagonally opposite edges, while the type B nails have both burrs on the same side because the metal was flipped for each stroke. This kind of evidence can be used to establish the approximate period of construction or alteration of a building. Type B cut nails continued to be the most common through most of the greater part of the nineteenth century. With the rapid development of the Bessemer process for producing inexpensive soft steel during the 1880s, however, the popularity of using iron for nail making quickly waned. By 1886, 10 percent of the nails produced in the United States were made of soft steel wire. Within six years, more steel-wire nails were being produced than iron-cut nails. By 1913, 90 percent were wire nails. Cut nails are still made today, however, with the type B method. These are commonly used for fastening hardwood flooring and for various other specialty uses."

Very valid points you have there. The quicker pulse delay will be a game changer if...... like you say it delivers the quieter/deeper detection of beaches for lost gold.

I will add one thing. If 1st Texas had released this machine 3 years ago it would have been more of a success, to little to late. Now I'm sure the reason White's made a waterproof version of the TDI stemmed from the Manta video and realizing that someone would snatch onto this machine. Now that being said, if they, or someone can develop a PI machine that can do the nail trick with a silver coin, it will have a better chance of cornering the market. By what I've been told by engineers over the years, making a true PI machine with iron discrimination and I mean a PI that can discriminate iron and still respond to silver coins would be close to impossible.

Me too, I hate to see them go under. Their machines have a superior audio function to say the least. When I had the Vaquero I could actually tell when the detector had found a pencil eraser metal tip. Amazing the clarity of the audio reports on the Tesoro machines.

Not to be to critical but nothing new, my White's TDI SL does the same thing. In fact, I found the heaviest gold ring ever using the same technic while hunting carpet of nails.

That is a valid point and yes it is very likely most of the machines detected the same targets. The ground in this area is littered with burnt coal waste and tends to skews the received signal. But one thing I can say about the Equinox, it has the most accurate ID of any machine I've ever had. It is amazing how good this machine actually is.

Nothing new that I can see. My White's SL can perform the same audio responses. Like I said, nothing new that I can see. I can detect a gold ring and ignore nails too.

The wiggle is defined by: I find the target and kind of hover the coil over the center of where I think it is. You don't have to move the coil much, maybe 3-4" left and right, not real slow but fairly quick. I use the front of the coil many times on targets that are not super deep. Real neat how that works. I had never really given the wiggle technic much a chance until yesterday.

Extreme enjoyment. This might not seem like much but this small school (built in the late 30’s) has been hunted for over 10 years. With machines like the: Tesoro Tejon Garrett AT Pro White’s DFX, V3i Fisher F75 and LTD Minelab Etrac, and CTX 3030 And now the Equinox 800 Countless hours hunting from three guys including myself. Now I will say we’ve found some nice stuff from this site over the past 10 years and we all thought it was cleaned out but surprise, it’s not, yea I know they never are. But I was not expecting this many nickels and some over 6” deep. Then the silver nickel at maybe 5” and tilted to maybe a 45 degree angle. I will say this machine has a very good audio response but one has to listen and learn. I did the usual noise cancel and started off with park 1. I wasn’t really happy so I tried each of the park/field programs and ended back with park 1 with one change, I set the iron bias to 0. It didn’t take long and I knew this was the settings for the day. Numerous times I tried park 2 and the two field programs but it seemed like park 1 was the very best at both a good audio and stable ID on located buried targets. After a while I started wondering why these targets had been missed. Taking my time, I stared rotating around each target and I was quite amazed at how stable the audio/ID was. These were absolutely dig, dig signals, no doubts about it, with the exception of the silver nickel. If the silver had not given a double beep I might have walked away but I’m glad I didn’t. Well, toward the end of the hunt I purposely moved to the trashy area of the school and wow this machine, even with the 11” coil separates very well. I might add, the old Minelab wiggle I used with the Etac and explorer works with the Equinox too. Found a somewhat nice signal that I thought might be a nickel. Did the wiggle and marked the spot. Called my buddy over to check the spot. He gave no indication it could be a good target but at 5” comes another nickel (gave a solid ID of 13) and surrounded by heavy trash. Well, we had to leave and to be honest I felt sorry for him because he had not dug anything but trash. Now I’m beginning to wonder if I should buy the 6” coil and hit the trash again. Extremely satisfied user

I so was needing additional information on the 6" coil. Thanks

Wow, that's what like to see. I will find Canadian in change but I've dug one but I live in Virginia and that's a long way from your town.

Awesome gold finds.

I wonder if that would apply to huge pieces of quartz's too? Most of the hills in area have outcrops of quartz.

Wow, that being the case a person should check any huge pieces of bed rock when every they are hunting. Wonderful story.

Mankind's attitude to gold is bizarre. Chemically, it is uninteresting - it barely reacts with any other element. Yet, of all the 118 elements in the periodic table, gold is the one we humans have always tended to choose to use as currency. Why? Why not osmium or chromium, or helium, say - or maybe seaborgium? That's where I meet Andrea Sella, a professor of chemistry at University College London, beside an exquisite breastplate of pure beaten gold. He pulls out a copy of the periodic table. "Some elements are pretty easy to dismiss," he tells me, gesturing to the right-hand side of the table. "Here you've got the noble gases and the halogens. A gas is never going to be much good as a currency. It isn't really going to be practical to carry around little phials of gas is it? "And then there's the fact that they are colorless. How on earth would you know what it is?" The two liquid elements (at everyday temperature and pressure) - mercury and bromine - would be impractical too. Both are also poisonous - not a good quality in something you plan to use as money. Similarly, we can cross out arsenic and several others. Sella now turns his attention to the left-hand side of the table. "We can rule out most of the elements here as well," he says confidently. "The alkaline metals and earths are just too reactive. Many people will remember from school dropping sodium or potassium into a dish of water. It fizzes around and goes pop - an explosive currency just isn't a good idea." A similar argument applies to another whole class of elements, the radioactive ones: you don't want your cash to give you cancer. Out go thorium, uranium and plutonium, along with a whole bestiary of synthetically-created elements - rutherfordium, seaborgium, ununpentium, and einsteinium - which only ever exist momentarily as part of a lab experiment, before radioactively decomposing. Then there's the group called "rare earths", most of which are actually less rare than gold. Unfortunately, they are chemically hard to distinguish from each other, so you would never know what you had in your pocket. This leaves us with the middle area of the periodic table, the "transition" and "post-transition" metals. This group of 49 elements includes some familiar names - iron, aluminum, copper, lead, silver. But examine them in detail and you realize almost all have serious drawbacks. We've got some very tough and durable elements on the left-hand side - titanium and zirconium, for example. The problem is they are very hard to smelt. You need to get your furnace up into the region of 1,000C before you can begin to extract these metals from their ores. That kind of specialist equipment wasn't available to ancient man. Aluminum is also hard to extract, and it's just too flimsy for coinage. Most of the others in the group aren't stable - they corrode if exposed to water or oxidize in the air. Take iron. In theory it looks quite a good prospect for currency. It is attractive and polishes up to a lovely sheen. The problem is rust: unless you keep it completely dry it is liable to corrode away. "A self-debasing currency is clearly not a good idea," says Sella. We can rule out lead and copper on the same basis. Both are liable to corrosion. Societies have made both into money but the currencies did not last, literally. So, what's left? Of the 118 elements we are now down to just eight contenders: platinum, palladium, rhodium, iridium, osmium and ruthenium, along with the old familiars, gold and silver. These are known as the noble metals, "noble" because they stand apart, barely reacting with the other elements. They are also all pretty rare, another important criterion for a currency. Even if iron didn't rust, it wouldn't make a good basis for money because there's just too much of it around. You would end up having to carry some very big coins about. With all the noble metals except silver and gold, you have the opposite problem. They are so rare that you would have to cast some very tiny coins, which you might easily lose. They are also very hard to extract. The melting point of platinum is 1,768C. That leaves just two elements - silver and gold. Both are scarce but not impossibly rare. Both also have a relatively low melting point, and are therefore easy to turn into coins, ingots or jewelry. Silver tarnishes - it reacts with minute amounts of Sulphur in the air. That's why we place particular value on gold. It turns out then, that the reason gold is precious is precisely that it is so chemically uninteresting. Gold's relative inertness means you can create an elaborate golden jaguar and be confident that 1,000 years later it can be found in a museum display case in central London, still in pristine condition. So what does this process of elemental elimination tell us about what makes a good currency? First off, it doesn't have to have any intrinsic value. A currency only has value because we, as a society, decide that it does. As we've seen, it also needs to be stable, portable and non-toxic. And it needs to be fairly rare - you might be surprised just how little gold there is in the world. If you were to collect together every earring, every gold sovereign, the tiny traces gold in every computer chip, every pre-Columbian statuette, and every wedding ring and melt it down, it's guesstimated that you'd be left with just one 20-metre cube, or thereabouts. But scarcity and stability aren't the whole story. Gold has one other quality that makes it the stand-out contender for currency in the periodic table. Gold is... golden. All the other metals in the periodic table are silvery-colored except for copper - and as we've already seen, copper corrodes, turning green when exposed to moist air. That makes gold very distinctive. "That's the other secret of gold's success as a currency," says Sella. "Gold is unbelievably beautiful."

Rings are so nice?

They have taken the original youtube video of the Aqua Manta down. I've had the youtube site ear marked since they first made the beach video and it is now gone. It was very interesting to see the machine work on the beach but no more.

They are super, did just what they said.

Awesome silvers, never, never dug a half dime.

Thanks for your input. I'll consider. Actually the only reason I'm keeping the F75 is for the small coil.