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

 

FINE QUALITY ANTIQUE ENGLISH SET TROY OUNCE WEIGHTS BATE of LONDON BOXED c1835 A top quality set of antique brass, English William IIII period troy ounce weights; made by Bate of London, and consistin

 

I am selling several very nice Leica made camera items-have a look at my other items to see them all. Leitz Wetzlar imersion oil--used for miscroscope work.Made in 1967--this was sealed in a plastic b

 

fairydustdeals Store Piso's Cure for Consumption Game Board

 

RARE VINTAGE DOCTOR'S MEDICAL BAG ORIGINAL ESTATE CONDITION AUCTION ITEM DETAILS VERY NICE FIND... GREAT LEATHER EXTERIOR VERY CLEAN INTERIOR OPENS ON SMOOTH WORKING HINGES LARGE THREE LATCH BAG - LAT

 

Antique Brass Chinese Eyeglasses w Folding Stems c1800s Description: This is an antique pair of 19th century brass Chinese eyeglasses with folding hinged stems. The eyeglasses are held on by a string

 

NICE RARE EARLY DOCTOR'S SCARIFICATOR --IN WORKING ORDER -- AS FOUND CONDITION, NEEDS OUTSIDE CLEANING--USED FOR BLEEDING OR FOR THE INTRODUCTION OF MEDICINES INTO THE BODY --SCARCE STYLE-- NICE SIZE

 

Antique Civil War Era Steel Frame Wire Stem Eyeglasses Mid to Late 1800s Description: This is an antique pair of steel frame eyeglasses dating, I would guess, to the mid to late 1800s. The glasses hav

 

*yeates & son dublin POCKET COMPASS C 1870*EXTREMELY RARE SCIENTIFIC INSTRUMENT* IN EXCELLENT CONDITION BOTH COMPASS AND CASE AND IN PERFECT WORKING ORDER ITEM WILL BE EXTREMELY WELL PACKED AND SH

 

Everything I'm selling is from the estate of a prominent Ear Nose and Throat doctor who lived in the Seattle area during the early 1900s. Most of the items need cleaning and polishing. You get everyth