This is a Crookes tube with multiple electrodes. The gas pressure is lower than most Crookes tubes, correct to allow electron emission in a straight line from the cathode disk while having enough air

 

Please note: We ship Worldwide. This item will be posted overseas via Royal Mail International Signed For.Europe: £19Rest World: £29 A large, exceptional 19th century brass & mother-of-pearl inl

 

Due to the recent storms in NSW, I’ve decided to sell off some of my oddities to pay for repair bills. I’m planning to list about 30 listing in the next few days, their mainly old medical instrume

 

Nice Red Apothecary Jar that is Just under 4.5" in diameter and a overall height of 9.5 and 8" for just the bottle. This bottle has no seams on the side so I am assuming it is Blown instead of molded,

 

Superb Antique Mahogany cased Wimshurst Machine Scientific Instrument. In excellent working order. A few turns of the handle and there is a lightening bolt produced. Circa 1900-1910 in date. 28cm x 25

 

__________________________ US Sale Only Shown is an ‘OPTHALMOSCOPE EXAMINATION INSTRUMENT. ‘. Original fitted case. Good overall condition. Nice addition to a medical or opthalmolosy display.....

 

This is a nice original medical book, leather bound with solid covers and spine, This is the "how to" medical book of the Civil War period. Though published in 1844, this book covers the same subjects

 

“Quack Medicine” Purple Ray Machine – Heals All !!! Made by the Fitzgerald Mfg. Company in the 1920’s Really Cool --- Seen on “American Pickers” TV Show Deluxe Model with 5 Attachments Min

 

I have three Nursing Practice books for you. This is the third set available. These books are fun to read. They tell you how to make a bed correctly, what to wear to bed and how to dress a person,taki

 

                  Antique Instrument / Military Tripod - U.S.Signal Corps, Julien Freize                             Scroll for description                         �