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-/-OLIC-^IOH + 9 frfto or of the Jolentlflo Aoprlotia SSUSfili gha FjLrat ^ransat3,unfclq v0lophonlc gr.u^jftfaft Dear Siri- I tun preparing a short history/ of wireless telephony, jnl having been for ooino years oat of touch with t.iia 11 e oi' worit, am unable to obtain oertai: rather important data relative to the history of the Art, Si ce the scientific American roaches so any thousands of engi eers, it has occurred to re* that the information algM be obtained if you would bo so kind as to publish this letter of Inquiry with the statement that I should bo extreiiely obliged if those engineers having the information at their disposal would please forward it to The first point in regard to whioh information is desired is this 8 A&otrfc xjvombor Rook, |rs»9acrftBt9*i/Ga, an crssrih unisk* Sggtlflntl, ffllrVLooo flft/tiopq - pro \n open tloa^jyid tra woro working na/tl-Y "LI" tuiio, fWqWicy W9 j6o cyo3!bo ?or sec ont, to fWoiu dayli£»t o ohut down for a!.: out a r :>nt 1 at ti is 't i-rw to dake some change /n the aon UiioT^WOTw.^Uf: oi tiio . . r>rl v - dah on . bxit jymt inu I aendVkJ ( ofcoa jlocally fl'j n Br. at tc ., t iou moat) oi the time at 3nmt R©t:k 'rae abe;;^ v.itiK; ^pltinQ ifffltL n-^J ,lfeh to I o cjorspletod, in ii atallikg to^i^j ourj»w T7iruleMtelephoj» systo i batwoan the stati >n at j >r . it liock^ ISETS^ehusotts, fouli BtrJSio nt PlyrWlh, asaachnsotts, 1 torrtrt -olve miles away. lioontlrao the operators at Uaerihamish wore listening regularly evory nijht to other stations, partly for the >urpose of keeping in practice and obtaining data as to at lospherio absorption, etc., and partly so as to be sure to get any rasso. gos whioh d. ;at be sent from Br-Jit 00k, as we were using wireless exclusively in order to save cable expenses. Practically all the listening was done on H(*w tune as we had shortly previously made our very important discovery, later published In tho ulootrician, that while the absorption increased with increasing wave length up to .boat 100,000 frequency, beyond th.t point the absorption fell off very rapidly as the frequency was deoroaeed until t about 70,000 frequency trie absorp- tion was oorn jaratively sr^ill • Soiaetirae, I think* in November. 1906, I received a registered letter marked personal from one of the ^acrlhtdsh operators. In this lottor he stated that he had been listening in on a certain date, which he specified, and at a oortain hour, about four o*cloc; In the -orning t* 1 recollect it, and had noticed a reniorica )lo phono sonon wliich showed that apeoch could be transmitted by speaking in proximity to tho rotary spark gap ho were then using 10 iW'm rotary spark gap, giving about 500 or 1000 sparks per second.) He stated that at the date and hour specific I lie had ieard one of our Braafc Bock engineers giving instructions to one of his assistants in regard to tho running of the dynamos that the speech had cono in vory clear and plai , and that he wao able to identify the speaker aa Hp, Stein (now, I believe, with tho Bell Telephone Company); he wrote out in detail the words Whloh he statod he had heard :r. Stoln apeak to his assistant, as he hod written them down after hearing themj tho whole amounting to five or six sentences totalling between fifty and one hundred words.
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Title | PC_1140_94_Reginald_Fessenden_Sci_American_001 |
Full Text | -/-OLIC-^IOH + 9 frfto or of the Jolentlflo Aoprlotia SSUSfili gha FjLrat ^ransat3,unfclq v0lophonlc gr.u^jftfaft Dear Siri- I tun preparing a short history/ of wireless telephony, jnl having been for ooino years oat of touch with t.iia 11 e oi' worit, am unable to obtain oertai: rather important data relative to the history of the Art, Si ce the scientific American roaches so any thousands of engi eers, it has occurred to re* that the information algM be obtained if you would bo so kind as to publish this letter of Inquiry with the statement that I should bo extreiiely obliged if those engineers having the information at their disposal would please forward it to The first point in regard to whioh information is desired is this 8 A&otrfc xjvombor Rook, |rs»9acrftBt9*i/Ga, an crssrih unisk* Sggtlflntl, ffllrVLooo flft/tiopq - pro \n open tloa^jyid tra woro working na/tl-Y "LI" tuiio, fWqWicy W9 j6o cyo3!bo ?or sec ont, to fWoiu dayli£»t o ohut down for a!.: out a r :>nt 1 at ti is 't i-rw to dake some change /n the aon UiioT^WOTw.^Uf: oi tiio . . r>rl v - dah on . bxit jymt inu I aendVkJ ( ofcoa jlocally fl'j n Br. at tc ., t iou moat) oi the time at 3nmt R©t:k 'rae abe;;^ v.itiK; ^pltinQ ifffltL n-^J ,lfeh to I o cjorspletod, in ii atallikg to^i^j ourj»w T7iruleMtelephoj» systo i batwoan the stati >n at j >r . it liock^ ISETS^ehusotts, fouli BtrJSio nt PlyrWlh, asaachnsotts, 1 torrtrt -olve miles away. lioontlrao the operators at Uaerihamish wore listening regularly evory nijht to other stations, partly for the >urpose of keeping in practice and obtaining data as to at lospherio absorption, etc., and partly so as to be sure to get any rasso. gos whioh d. ;at be sent from Br-Jit 00k, as we were using wireless exclusively in order to save cable expenses. Practically all the listening was done on H(*w tune as we had shortly previously made our very important discovery, later published In tho ulootrician, that while the absorption increased with increasing wave length up to .boat 100,000 frequency, beyond th.t point the absorption fell off very rapidly as the frequency was deoroaeed until t about 70,000 frequency trie absorp- tion was oorn jaratively sr^ill • Soiaetirae, I think* in November. 1906, I received a registered letter marked personal from one of the ^acrlhtdsh operators. In this lottor he stated that he had been listening in on a certain date, which he specified, and at a oortain hour, about four o*cloc; In the -orning t* 1 recollect it, and had noticed a reniorica )lo phono sonon wliich showed that apeoch could be transmitted by speaking in proximity to tho rotary spark gap ho were then using 10 iW'm rotary spark gap, giving about 500 or 1000 sparks per second.) He stated that at the date and hour specific I lie had ieard one of our Braafc Bock engineers giving instructions to one of his assistants in regard to tho running of the dynamos that the speech had cono in vory clear and plai , and that he wao able to identify the speaker aa Hp, Stein (now, I believe, with tho Bell Telephone Company); he wrote out in detail the words Whloh he statod he had heard :r. Stoln apeak to his assistant, as he hod written them down after hearing themj tho whole amounting to five or six sentences totalling between fifty and one hundred words. |