Below are some patents that contain material about electrostatic machines. These patents are probably available from the several patent sites in the www. The copies here are encoded in djvu or pdf format. U. S. patents can be found at the U. S. Patent Office site (in tiff format). Other patents can be found at the European Patent Office site (in pdf format). Most of the U. S. patents about electrostatic influence machines can be found there under classes 310/309 and 310/310. Most european patents are under class H02N1.
Patents:
[DE145440] H. Wommelsdorf. "Kondensatormaschine," 18
July 1902. Condenser machine.
[DE161211] H. Wommelsdorf, "Querkonductor für
Influenzmaschinen," 23 November 1904. Neutralizer with
dial and curve to avoid the driving belt.
[DE176415] H. Wommelsdorf, "Aus einzelnen isolierenden
Platten mit zwischenliegenden Sektoren bestehende Scheibe für
Kondensatormaschinen," 9 August 1905. Disks with
embedded sectors.
[DE178052] H. Wommelsdorf, "Kondensatormaschine," 8
March 1904. Condenser machine with double rotation.
[US882508] H. Wommelsdorf,
"Static-Influence Electric Machine," 17 March 1908. Disks
with embedded sectors for influence machines.
[US883846] H. Wommelsdorf, "Electrical Multiple Influence or
Condenser Machine, " April 7 1908. Wommelsdorf condenser
machine with double rotation.
[DE238344] H. Wommelsdorf, "Scheibe für Influenz- und
Kondensatormaschinen," 25 December 1910. Disks with
embedded sectors. See also DE271742.
[DE244155] H. Wommelsdorf, "Influenzmaschine," 23
August 1910. Machines with insulation in Bakelit.
[DE240325] H. Wommelsdorf, "Scheibe für einseitig wirkende
Influenzmaschinen," 17 May 1911. Disks with rised
borders for increased insulation.
[AT56127] H. Wommelsdorf, "Scheibe
für Influenz- und Kondensatormaschinen," 11 November 1912. Disks
with embedded sectors for condenser machines.
[US1071196] H. Wommelsdorf,
"Influence Electric Machine," 26 August 1913. Electrostatic
machine with insulated sectors and inductors, and disks accessed
through the edges. Contains detailed drawings.
[DE321622] H. Wommelsdorf, "Kondensatormaschine," 21
March 1919. The classical form of the condenser machine.
[DE370980] H. Wommelsdorf, "Elektrophor," 23 February
1922. An electrophorus with two dielectric plates. See also
DE376196.
[DE392554] H. Wommelsdorf, "Influenzmaschine, deren Beläge
nicht nur von einen festen Isoliertoff umgeben sind, sondern auch
noch in ein flüssiges Dielektricum tauchen," 13 April 1923.
Machine using embedded sectors and liquid dielectric.
[DE 420402] H. Wommelsdorf, "Elektrostatische Maschine,
deren Induzierende Teile von einen Flüssigen Dielektricum
umgeben sind," 25 December 1924. Machine with the
inductor plates immersed in liquid dielectric.
[DE443699] H. Wommelsdorf, "Influenz- oder
Kondensatormaschine," 25 December 1925. Machines with
sectors suspended in the air.
[DE479991] H. Wommelsdorf, "Stromabnehmer für
Influenzmaschinen," 23 February 1928. Charge collecting
brush construction.
[DE482298] H. Wommelsdorf,
"Reibungselektrisierapparat," 29 April 1928. A
simple friction machine.
[DE546363] H. Wommelsdorf, "Verfahen zum Betrieb von
Influenzmaschinen mit mehr als zwei Polen," 7 February 1931.
Machines with more than two poles (appears to be the last
patent by Wommelsdorf).
[DE154175] A. Wehrsen and others,
"Scheibe für Influenzmaschinen," July 30 1903. Disks
with embedded sectors in several levels accessed by pins in the
disk face (the disks used in the "Wehrsen" machines).
See also DE154176, but I don't know of a machine using those
strange disks.
[US901666] A. Wehrsen, "Disk for Influence or Static
Induction and Condenser Machines," October 20 1908. Corrugated
internal sectors for influence machines. Identical to [AT36027].
[AT36027] A. Wehrsen, "Scheibe
für Influenz- bezw. Kondensatormaschinen," 25 January 1909.
Corrugated internal disk sectors for influence machines.
[US1006786] G. S. Piggott, "Space Telegraphy," October
24 1911. A Wimshurst machine in a pressurized box, with a
curious drive system and segmented sectors. The machine is used
in a radiotelegraphy transmitter.
[US275347] P. Atkinson, "Frictional Electrical
Machine," April 10 1883. Voss machine.
[US331754] P. Atkinson, "Frictional Electrical
Generator," December 8 1885. A double Voss machine, with
detailed plans.
[US700536] G. J. and D. C. Moore, "Apparatus for
Demonstrating the Phenomena of Electrical Storms," May 20,
1902. A Voss machine in a box with "house and
cloud" attachments for lightning rod demonstrations.
[US827497] O. Baysdorfer, "Static Electric Machine,"
July 31 1906. Double Voss machine in a box with some
different structural details
[US873178] W. C. Shinn, "Static Electric Machine,"
December 10, 1907. Double Voss machine in a box with
attachments for lightning demonstrations.
[US1043030] T. H. Patee, "Static Electric Machine,"
October 29, 1912. Double Voss machine in a box with
attachments for lightning demonstrations, and some different
structural details.
[US634467] K. S. Lemström,
"Electrical Influence-Machine," 10 October 1899. A
cylindric Wimshurst machine.
[US720711] K. S. Lemström,
"Electrical Influence-Machine," 17 February 1903. A
better structure for a cylindric Wimshurst machine.
[US1991236] R. J. Van de Graaff, "Electrostatic
Generator", 12 February 1935. The Van de Graaff generator.
The list of Wommelsdorf's patents (US, AT, and DE) appears to be complete.
Developed and Maintained by Antonio
Carlos M. de Queiroz.
Created: 01 November 2000.
Last update: 20 July 2003.