Ce spun oamenii - Scrieți o recenzie
Nu am găsit nicio recenzie în locurile obișnuite.
Alte ediții - Afișați-le pe toate
action alternating amount appear attraction battery body called carbon charge circuit coil conductor connected consists copper detect direction discharge distance dynamo earth effect elec electric current electro-magnetic employed energy engine ether evidence excited exist experiments feet flow fluid galvanometer give glass hand heat horse power hundred Illustrations inch increase induction interesting iron lamp lead length Leyden jar light lines of force machine magnetic manifestations matter means measure medium metals method miles mirror motion motor move movement Nature needle negative observed obtained ordinary oscillations pass phenomena phenomenon photograph piece pipes placed plate pole positive possible practical present pressure produced Prof rays reflected resistance ring sound space spark speak steam substance suitable surface telephone terminals theory tion transformer transmitted tube turn vibrations walls waves wire
Pagina 308 - Our Place among Infinities: A Series of Essays contrasting our Little Abode in Space and Time with the Infinities Around us. Crown 8vo, cloth extra, 6s. The Expanse of Heaven : A Series of Essays on the Wonders of the Firmament.
Pagina 290 - ... of our planet, so far as we know it; and nitrogen is very far the predominant constituent of our atmosphere. If the earth is a detached bit whirled off the mass of the sun, as cosmogonists love to tell us, how comes it that in leaving the sun we cleaned him out so completely of his nitrogen and oxygen that not a trace of these gases remains behind to be discovered even by the sensitive vision of the spectroscope...
Pagina 250 - In extending the researches relative to this part of the investigations, a remarkable result was obtained in regard to the distance at which inductive effects are produced by a very small quantity of electricity; a single spark from the prime conductor of the machine, of about an inch long, thrown on the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of wire...