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

 

(This listing was cancelled 10-9-2012 so additional and corrected information could be added.) Brass Tourniquet frame, marked on the 'T' of the screw for the maker 'Otto & Reynders', and the New Y

 

Up for Bid: Vintage DuPont Blasting Cap Tin (2.5in.x 2.0in.x 1.5in.)...In Good Condition with some general overall wear...Also the top lid is faded...SELLING WITH NO RESERVE.!!!!!

 

U.S.A. Eagle, Trade Mark, Pat Mar. 22, 1904. Anton & Sn, Mononghela, PA. Miner's oil wick lamp with drip ring spout, brass, copper and tin. Never fired, needs cleaned. Measures 2 1/2" high, 2" bas

 

A fine Darlaston mount for the polariscope, vertical section of lip of cat to show sensory hair follicles.

 

Leather Doctors/Vets Gladstone style bag c1920/30s35 x 15 cm approxFair condition with wear on the creases, which is to be expected with a hole on the crease at one end as shown in photo. See other li

 

Antique "BAUSCH & LOMB" MONOCLE or QUIZZING GLASS in ORIGINAL LEATHER CASE - convex lens approx. 2" across...metal edge marked: B & L OPT. CO...hinged metal handle approx. 2" long...soft leath

 

1892 MOON PLANET LANDSCAPE EARTH PLANET Antique Lithograph FOLIO Print Weiss Click to Enlarge Light bar,strips at the top and bottom of the picture is from the scanner. Original old German lithograph

 

Antique Amber Medicine Brown Glass Bottle 16 OZ 8 1/4" Tall #3 Glass stands 8 1/4 inches tall and has a base length of 3 inches. Glass is perfect with no chips or cracks, please see photos. I have a t

 

I PURCHASED THIS NICE OLD CARVED WOOD BAROMETER AT A LOCAL SALE, IT MEASURES 18" LONG, IS VERY OLD, THE FACE READS, STURM REGEN ODER WIND VERANDERLICH, SCHON WETTER BESTANDIG, NOW I DO NOT COLLECT THE