Day No.7 – Now that’s a demagnetizer !

A Boettger and Wittig Demagnetizer, a watch was placed inside of the core and the slide was then moved in and out to change the polarity of the magnet, as described in patent number 699863:  The slide and comb thereon constitute a pole changer, and in practice the same is actuated to cause frequent reverses of the direction of current that goes through the electromagnet. A magnetized watch, tool, or other device is placed in the hollow core of the electromagnet… the pole changer is operated to effect its function… the result being demagnetization of said device.

Boettger and Wittig Demagnetizer

 

A Boettger and Wittig Demagnetizer, a watch was placed inside of the core and the slide was then moved in and out to change the polarity of the magnet, as described in patent number 699863:  The slide and comb thereon constitute a pole changer, and in practice the same is actuated to cause frequent reverses of the direction of current that goes through the electromagnet. A magnetized watch, tool, or other device is placed in the hollow core of the electromagnet… the pole changer is operated to effect its function… the result being demagnetization of said device.

The watch is placed inside

 

Patent US699863

Patent US699863

 

To use, a watch is placed inside of the core; the slide is then moved in and out to change the polarity of the magnet, as described in patent number 699863:

The slide and comb thereon constitute a pole changer, and in practice the same is actuated to cause frequent reverses of the direction of current that goes through the electromagnet. A magnetized watch, tool, or other device is placed in the hollow core of the electromagnet… the pole changer is operated to effect its function… the result being demagnetization of said device.

pic2467a

Oddly enough, or maybe not oddly at all given the circumstances, Dennis had a collection of demagnetizers. This was my by far my favorite though.

Here are some other goodies from today’s work:

P1120802

Gorgeously golden aged lacquer on an antique microscope

 

P1120808

Pocket meter with original leather case

 

P1120829

A sample of the level collection

 

P1120793

Lovely little drill press

 

P1120796

Extra Schaublin 102 headstock

 

P1120773

Engine turned background

 

P1120771

Watchmakers lathe transmission drives