French Demonstration Model by Ducretet, c. 1895 Signed: "E. Ducretet et Cie", physical rotating device for liquids, glass cylinder with 4 small "b...

Electrophysical Demonstration Model, c. 1890 France, marked "HRFA", mahogany, thick-walled glass container (fixed to the base), 6 electric connect...

Large Experimental Electric Motor, 1871 onwards Test model according to Zénobe Théophile Gramme (Belgium), with ring beam, wooden frame, hand-woun...

10 Geißler Tubes, c. 1900 In various forms, length each 4 ½ in. Condition: (2/-) 10 Geißler'sche Röhren, um 1900 In verschiedenen Formen, Länge j...

Leybold X-Ray Tube, c. 1910 Demonstration model, 45° inclined anode, length 14 1/5 in., with Leybold label, on wooden stand. Condition: (2-3/-) R...

2 Electrostatic Induction Demonstration Models, c. 1900 Glass balls with hanging gold strips, conductors on the top, height 7 ½ and 9 7/8 in. Cond...

2 Chrome Acid Cells Early type of primary cells, with zinc anode and carbon cathode, height 8 ¼ and 12 ¼ in. Condition: (3+/-) 2 Chromsäure-Eleme...

4 Interesting Physical Demonstration Models, c. 1900 1) Ebert's phosphorescent lamp with 2 electrodes. - 2) Crookes' apparatus for experiments on ...

Electric Motor with Rotating Geißler Tubes, c. 1900 Physical demonstration model, height 7 4/5 in., tube length 8 ¾ in. Condition: (3+/-) Elektro...

"Geißler Tube" Demonstration Model With 4 fluorescent liquids, height 12 ½ in. Condition: (3+/-) Demonstrationsmodell "Geißler-Röhren" Mit 4 fluo...

7 Electron Tubes 1) 2 Geißler tubes with fluorescent liquids, length 6 ¼ and 7 4/5 in. - 2) 2 Geißler tubes, 1 with uranium glass, length 6 ½ and ...

Large Geißler Tube, c. 1900 Filled with 3 different gases, length 31 ½ in. Condition: (2+/-) Große Geißler'sche Röhre, um 1900 Gefüllt mit 3 unte...

Static Charge Demonstration Model Nickeled brass tube on isolating glass rod, with 6 elder-marrow balls on strings, height 14 ½ in. Condition: (2-...

English Brass Plate Sundial, 19th Century Signed: "Thos. Lowie (or Sowie), Coventry", with Roman numerals, Ø 6 ½ in. Condition: (3+/-) Englische ...

Large Induction Coil According to Ruhmkorff, c. 1900 No. 7934, manufactured by Fr. Klingelfuss & Co., Basel. Coil length 16 ½ in., Ø 8 ¾ in., on w...

Large Wimshurst's Electrostatic Machine, c. 1890 Laboratory and education model, disc diameter 17 in.! Handcrank-driven, complete with Leyden jars...

Abel's Petroleum Tester, c. 1885 Manufactured by "Berthold Pensky, Berlin", serial no. 165, used for determination of flammability of petroleum, w...

Large Nairne-Type Electrostatic Generator, c. 1800 Glass cylinder Ø 11 2/5 in., turned fruitwood belt-drive, crank, overall size 16 ½ x 24 4/5 x 2...