Pacific service magazine . Where flood lighting was used with unusual spectacular effect—The Panama-PacificInternational Exposition in San Francisco Pacific Service Magazine 51. The beginningof electric light-ing may be said todate from the be-ginning of thenineteenth cen-tury when SirHumphry Davy,a well knownEnglish chemist,heated strips ofvarious metals toincandescence bypassing currentthrough them andshowed that plat-inum would stayincandescent forsome time with-out oxidizing. Using two sticks of charcoalconnected by wires to the terminals of apowerful battery of two thousand cells, hedemon
Pacific service magazine . Where flood lighting was used with unusual spectacular effect—The Panama-PacificInternational Exposition in San Francisco Pacific Service Magazine 51. The beginningof electric light-ing may be said todate from the be-ginning of thenineteenth cen-tury when SirHumphry Davy,a well knownEnglish chemist,heated strips ofvarious metals toincandescence bypassing currentthrough them andshowed that plat-inum would stayincandescent forsome time with-out oxidizing. Using two sticks of charcoalconnected by wires to the terminals of apowerful battery of two thousand cells, hedemonstrated before the Royal Societythe light produced by touching the stickstogether and then holding them aparthorizontally about three inches. The bril-liant flame obtained he called an arc be-cause of its arch shape, and thus he drewthe first carbon arc. In 1840 Sir WilliamGrove, an English judge and scientist,made an experimental lamp by attachingthe ends of a coil of platinum wire to cop-per wires, the lower parts of which werewell varnished for insulation. The plat-inum wire was covered by a glass tumbler,the open end set in a glass dish partly filledwith water. This
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Keywords: ., bookcentury1900, bookdecade1910, bookidpacificservi, bookyear1912
