K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator
(Last Model)
This #4012 Thatcher calculator / slide rule is
in super nice condition. The serial # is 6285 and this # can be found
on the original OAK mounting board near the top back edge. Near the
end of production K & E stopped using the typical mahogany
mounting board and outer box and began using oak for the last few hundred
before ending production.; This 4012 oak box & base variant is much harder to find than the
earlier mahogany versions. In addition to the K & E serial number
there is also a brass plaque on the base board indicating it was property of the US Navy at one
time. The inner scales on the drum are white and very nice. The scales on the outer frame are near perfect as well. They have hardly yellowed at all and there is no lifting of the paper scales or spotting to be seen. The instructions on the base are very nice as can be seen in the pics, . The oak box is nice noting a few scratches and some loses to the finish. There are no names, initials, or other carved into the box, base, or calculator.
The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule. Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators catalog # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.
A nice piece that will display well and be a great addition to the old office or calculation related collection!! Enjoy.
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SR-4012N
Fine . . . . . $1295.00
To Order Email: patentedantiques@gmail.com
Type
I Curta Calculator
The serial # on this early Type 1 Curta is
39999. This
Type I Curta Calculator is in excellent condition and operates flawlessly.
The body is very nice and shows minimal wear or tear. There are minor
scuffs and losses on the outer metal case. The previous owners name
was professionally inscribed on the front below the Curta name. I
looked up the name and was surprised at how many people there are in the
world named Brett Huggins. In addition to the serial number the bottom of the calculator is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has original pads top and bottom to protect the device.
The Curta calculator was invented by Carl Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's. In todays world they are at times used in road rallies and other applications but they are worth more as collectibles and examples of calculation history. The last examples were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.
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AMN-CURTA-39999
Fine . . . . . $1295.00
To Order Email: patentedantiques@gmail.com
Electric Motors / Dynamos / Fans / Steam Engines / Water
Motors
& Other Early Power Devices
Thomas Edison Mary-Ann Dynamo /
Electric Motor Model Wonderful representation. Clean, straight from the collection and ready for yours. Nice!!
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SE-MARYANN
Fine . . . . . $495.00
To Order Email: patentedantiques@gmail.com
Thomas Edison's
Edison System Ampere Meter This Edison System ampere meter is a rare
and important piece of Electrical history. The condition of this large and
unusual Edison amp meter is exceptional. The scale
reads up to 264 amps, off the scale, indicating this meter must have been
used with a
huge dynamo or motor.This Edison meter measures approx. 10" across and 16" tall. The back of the case is cast iron. The etched glass face is flawless. The previous owner made a copy of the paper scale to cover the original scale to help preserve it. The original paper scale is behind the copy on the face in the pics. It is in nice condition.
The wooden case is original finish and in fine condition. The interior workings look like new. The wooden case is stamped in two places with Elec. Eng. Dept. L.S.J.U. which is Stanford University in Palo Alto CA.
A super nice and rare piece of American Electrical History that will display well and be a great addition to the old office, electrical, scientific or related collection! Nice!!
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AMN-ED-METER
Fine . . . . . $6750.00
To Order Email: patentedantiques@gmail.com
Telegraph & Telephones & More
Electrical
World and Engineer Magazine January 18 1902
I have about 20 issues of this magazine in similar condition. The first
40 or so pages are all advertising. So are the last 10 - 15. The
middle discusses cutting edge developments in the emerging field of electricity
and engineering.There are ads for all sorts of rare things one could only wish to find. There are fans, motors, steam engines, light bulbs, arc lamps, telephone and telegraphy related ads, ads for tools and much more. The ads near the end mostly deal with larger things like steam engines, locomotives and large pieces of machinery and tools like milling machines, lathes and the like. Most all are in very nice condition noting the covers are very fragile and some are loose. The interiors on all are nice.
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SE-MAGS-EWE-2
Good + . . . . . . . $20.00 / Each
To Order Email: patentedantiques@gmail.com
Electrical
World and Engineer Magazine January 11 1902
I have about 20 issues of this magazine in similar condition. The first
40 or so pages are all advertising. So are the last 10 - 15. The
middle discusses cutting edge developments in the emerging field of electricity
and engineering.There are ads for all sorts of rare things one could only wish to find. There are fans, motors, steam engines, light bulbs, arc lamps, telephone and telegraphy related ads, ads for tools and much more. The ads near the end mostly deal with larger things like steam engines, locomotives and large pieces of machinery and tools like milling machines, lathes and the like. Most all are in very nice condition noting the covers are very fragile and some are loose. The interiors on all are nice.
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SE-MAGS-EWE-2
Good + . . . . . . . $20.00 / Each
To Order Email: patentedantiques@gmail.com
Crouse Hinds
500 Amp - 125 Volt Copper & Bronze Electric Knife Switch This
huge antique electrical knife switch is made of almost all copper & bronze save the
2 mounting posts at the rear of the switch and the Bakelite handle and attaching bar. All
told, with all seen on the table, there is over 70 lbs of copper in this
switch and attachment parts. At something over $2.00 / lb scrap
that comes to $150.00 or so in scrap. The large switch measures approx. 18" long from handle to back joint w/ vertical post. The last two of the 1" dia. by 1 1/2 long threaded rods are steel w/ bronze or copper uppers. Note the decorative knurling and cove on each of the upper bolsters. All of the other 8 contact rods are all copper, including the threaded rods and nuts as they carried electrical current. The smaller switch seen further back, 1 of 5, is described in the ad below.
This large electrical knife switch came off a large lighting control panel made of a marble slab that was disassembled. It dates from right around the turn of the century. 1900 that is. It can easily be remounted to a block of wood or other material to be displayed or be put back into service. The last 4 pics show that panel before it was taken apart. Perfect for the Frankenstein / Steampunk / Man-cave application. HUGE!!
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SE-BIG-SWITCH
Good . . . . . . . $250.00
To Order Email: patentedantiques@gmail.com