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Tuesday, July 12, 2016

49.tnpsc group 2 study material

எடிசன் காப்புரிமம் பெற்ற கண்டுபிடிப்புக்களில் ஒரு பகுதி
001 Design for an Incandescent Electric Lamp 1881
002 Design for a Phonograph Cabinet 1910
003 Electrographic Vote-Recorder 1869
004 Printing Telegraphs 1869
005 Printing-Telegraph Apparatus 1869
006 Automatic Electrical Switch 1869
007 Electro-Motor Escapements 1870
008 Governors for Electro Motors 1871
009 Telegraphic Transmitting Instruments 1871
010 Electro-Magnets for Telegraph Instruments 1871
011 Machinery for Perforating Paper for Telegraph Pump 1871
012 Type Wheels for Printing Telegraphs 1872
013 Printing Telegraph Instruments 1872
014 Electro Magnets 1872
015 Rheotomes or Circuit-Directors 1872
016 Transmitters and Circuits for Printing Telegraphs 1872
017 Unison-Stops for Printing Telegraphs 1872
018 Paper for Chemical Telegraphs 1872
019 Apparatus for Perforating Paper for Telegraph Use 1872
020 Electrical Printing Machines 1872



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