joonn dollond

joonn dollond efrs (juun 10 oo.ezz. (juun 21 enn.ezz.) 170630 november 1761) oru engleesh optishyanaayirunnu, vijayakaramaya optiks bisinessinum chrometic doubletukalude patentinginum vaanijyavalkaranathinum perukettayalaayirunnu.
jeevacharitram.
thaan janicha landanile spittalfeeldile pattunool neythukaaranaaya huganote abhayaarthiyude makanaayirunnu dollond. addeham pithaavinte bisinesses pinthudarnnenkilum laattin, greak, ganitham, bhauthikashaasthram, shareeraghadana, mattu vishayangal ennivayekkurichu arivu nedaan samayam kandethi. 1752-ll addeham pattunool neythu upekshichu 1750-ll opttikkal upakaranangalude nirmmathaavaayi bisinesses aarambhicha thante mootha makan peettar dolontinoppam (1731-1820) chernnu; eee bisinesses dollond ichison aayi maari. addehathinte prashasthi athivegam valarukayum 1761-ll addeham raajaavinte optishyanaayi niyamikkappedukayum cheythu.
1758-ll addeham "prakaashatthinte vyathyasthamaaya apachayathekkurichulla chila pareekshanangalude vivaranam" ("phil") prasidheekarichu. trans.", 1758), thante peru prathyekamaayi bandhappettirikkunna nettatthilekku addehathe nayicha pareekshanangal vivarikkunnu, kireedatthinteyum flint glassukaludeyum samyojanathiloode chrometic lensukal nirmmikkunnathinulla oru maarggam kandethukayum chrometic vyathiyaanam (varnna arikukal moolamulla valachodikkal) kuraykkukayo illaathaakkukayo cheiyunnu. glass, vaattar lensukal ennivayude samyojanathiloode achromatism labhikkumenn 1747-ll leonhard euler abhipraayappettirunnu. sarr isak nyoottan nadatthiya prasthaavanakale aashrayich, eee saadhyathaye aadyam ethirthu ("phil". trans."1753), ennaal pinneedu, sweedish bhauthikashaasthranjanaaya saamuval clingensteerna (1698-1765), nyoottante dispersion niyamam nireekshicha chila vasthuthakalumayi poruthappedunnillenna choondikkaanichathinushesham, dollond eee chodyam pariharikkan pareekshanangal aarambhichu.
1757-nte thudakkathil glass, vaattar lensukalude sahaayathode chrometic refraction uthppaadippikkunnathil dollond vijayichu, kurachu maasangalkk sesham vyathyastha gunangalulla glassukalude samyojanathiloode athe phalam nedaan addeham vijayakaramaayi shramichu (dooradarshinikalude charithram kaanuka). eee nettatthinu 1758-ll royal sosaitti addehathinu copley medel nalkukayum moonnu varshathinu sesham athinte amgangalil oraale thiranjedukkukayum cheythu. cheria konukal alakkunnathinulla upakaranangalekkurich dollond rund prabandhangalum prasidheekarichu ("phil". trans.", 1753,1754).
1761ll jorjju moonnaaman raajaavinte optishyanaayi dollond maari. aaa varsham november november landanil vachu apoplexy baadhichu addeham marichu. 
kudumbam.
addehathinte makal saaraa dollond addehathinte ayalvasiyum suhruthumaaya jessy ramsdeneyanu vivaham kazhichathu.
kandupiduthathinu munganana nalkuka.
nalkuka 1747num idayil berlin academyude memoyarukalil prasidheekaricha prabandhangalil leonhard euler chrometic vyathiyaanam kuraykkunnathinulla oru saidhaanthika sameepanam aavishkarichu. joonn dollond paper vaayikkukayum oru chrometic lense nirmmikkunnathinulla pareekshanangal nadathukayum cheythu, koodaathe 1758 epril 19 nuu 14 varshathekku anuvadicha chrometic doubletinu pettant nediya aadya vyakthiyaan. ennirunnaalum, atharam lensukal nirmmikkunnath adhehamalla. chesttar muur haalinte nirddeshangal paalich opttishyan jorj baas 1733-ll thanne atharam lensukal nirmmikkukayum vilkkukayum cheythu. 1750-kalude avasaanathil, baas haalinte roopakalppanayekkurichu dolondinode paranju; dollond saadhyathakal kaanukayum avaa punarnirmikkaan kazhiyukayum cheythu.
dolondinu munkaala joliyekkurich ariyamaayirunnuvennum thante pettant nadappilaakkunnathil ninnu vittunilkkukayaayirunnum thonnunnu. addehathinte maranashesham, addehathinte makan peettar pettant nadappakkaan nadapadiyedutthu. baas, benchamin martin, roobert ryoo, jessy ramsden ennivarulppede addehathinte niravadhi athiraalikal nadapadiyedutthu. muun kandupiduthakkar kandupiduthathe "chooshanam" cheythappol dolondinte "chooshanam" kaaranam pettant saadhuthayullathaanennu kodathi kandethiyathinal dolondinte pettant sharivachu. niravadhi opttishyanmaar niyama nadapadikalkku chelavaakkiyathine thudarnnu nasippikkappedukayum avarude kadakal adaykkukayum cheythu. 1772ll kaalavadhi theerunnathuvare pettantinte saadhuta nilaninnu. pettantinte kaalavadhi kazhinjathinethudarnnu englandile chrometic doubletukalude vila pakuthiyaayi kuranju.

