1908 Weinhold ' S Apparatus Max Kohl Early DC/AC Demonstrator With Tesla Motor




Item History & Price

Information:
Reference Number: Avaluer:130875
Original Description:

While it may be convenient for us to believe that innovative product design began a dozen years ago with the launch of the iPhone, the practice of fusing form with function actually goes back a bit further than that. There were the Great Pyramids, of course. They were around before the iPhone. And the abacus. That was invented before Apple even went public. And the Papal Basilica of St. Peter.  I don't think Michelangelo even knew Steve Jobs. So yes, the trend has legs, as the...y say in the movie business. Which is why I get a bit giddy when I'm able to present a top shelf assortment of technical antiquity like I've got lined up for you this week. My only regret is that it may be a tough act for me to follow, but I'll worry about that next week. So check it all out. Seven splendid ancient examples of industry running headlong into art. And don't forget, you can click this link to quickly add and then save me to your favorite seller list and Ebay will automatically send you updates when I put similar new auctions online.
Here's a century-old electromagnetic demonstration set manufactured in Germany by Max Kohl A.G.  It is...unbelievably beautiful.  Not to mention...pretty damn cool. And...completely original. 
A Weinhold's Apparatus (there were several different types sold by Kohl, starting in about 1904), the set consists of a 17" x 9" control board with three interchangeable working electric models, the largest of which is Kohl's visually compelling model of a Tesla 2 Phase AC motor. If I got my homework right, the apparatus was designed to show the effect of rotating fields on electromagnetic induction devices. Direct current, when connected to the binding posts on the commutator end of the control board (looks like a large wire-wound rheostat), is inverted into low frequency alternating current as the crank is turned by hand. This alternating current, flowing through the copper contact pins at the opposite end of the board, in turn energizes the motor's rotor. The polarity can be shifted by changing the orientation of the models on the copper contact pins.

Condition is excellent, as you can see in the photographs. Construction is primarily wood, brass and gutta percha, and the apparatus has been well taken care of over the years.  In fact, it might never have even been used.  All three rotors spin freely. Multi-colored enamel on the windings is completely original and in excellent condition, with very few signs of wear, just scattered minor marks consistent with age and gentle handling.  Board finish is original, and it's still as smooth and glossy as glass. Metal manufacturer's tags are in excellent condition -- clean and legible. If properly and safely energized, the apparatus should work as designed. Windings on all 3 models check good for continuity, and the commutator checks good too.  All of the wiring on the control board is sound. 
The largest model is approximately 9" tall.  The smallest one is approximately 4" tall.  As noted above, the control board measures approximately 17" x 9". Shipping weight, properly packed, will be approximately 25 lb.  
That's about it. I will package it properly so that it arrives at your doorstep safely.  I have been shipping antique phonographs and radios for years, and if you check my feedback, you'll see that I know how to do it correctly.  Buyer prepays and includes shipping.
_______________________________Bidders Outside The USA Please Note: There's a glitch in ebay's USA site software that's preventing my Ebay Store from being exported to several non-USA ebay sites. Here's the workaround. If you click on my feedback score, you'll be taken to my feedback page. There, on the right side of the page, you'll see a link that allows you to "view items for sale." If you click that link, you'll see everything that I currently have listed. Alternatively, if you click my seller name, "firebottles, " you'll be taken to my seller page, where you can also view everything that I currently have listed. I apologize for the glitch. I'm trying to get it resolved with ebay.

00898


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