american hand book of the daguerreotype-第24部分

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his　city；　or　myself；　used　with　tolerable　success；　iodine　in　large　excess　to　nitric　acid　and　water；　and；　subsequently；　to　nitro　muriatic　acid　（which　reacted　and　formed　a　peculiar　chloride　of　iodine）；　this　latter　combination　proved　to　be　preferable　to　simple　iodine；　at　the　same　time　somewhat　more　sensitive；　and　was　used　by　me　in　this　city　up　to　the　time　of　my　leaving　for　London　（October　1；　1840）。　On　arriving　in　London；　I　instituted　a　series　of　experiments　in　the　various　chemical　combinations；　solely　with　the　view　to　be　enabled　to　obtain　more　speedily　a　portrait　than　it　was　practicable　to　do　with　any　known　chemicals　at　that　date。　The　high　latitude；　and　the　winter　season　of　the　year　rendering　but　a　feeble　light　at　best；　the　greater　the　necessity　for　a　more　sensitive　chemical　preparation　to　the　shortening　the　time　for　a　sitting。　Near　the　beginning　of　the　year　1841；　I　discovered　and　practically　applied；　chloride　of　iodine　to　great　advantage；　and；　as　far　as　memory　serves　me；　I　believe　the　first　used　in　this　country　was　some　made　and　shipped；　Messrs。　Harnden　&　Co。；　from　London；　to　Mr。　Wolcott；　in　New　York。

About　the　same　time；　Mr。　John　Goddard；　of　London　（who　was　associated　with　myself）；　discovered　a　rather　valuable　combination　of　chemicals；　consisting　of　a　mixture　of　iodine；　bromine；　iodus；　and　iodic　acid；　and　a　proper　combination　of　those　bodies　gave　an　action　somewhat　more　sensitive　than　chloride　of　iodinebut　the　〃high　lights〃　of　the　portraits　would　become　solarized　or　overdone；　more　frequently　with　this　combination　than　with　the　chloride　of　iodine。　Throughout　the　year　1841；　I　used；　with　great　success；　chloride　of　iodine；　applied　as　one　coatingoccasionally　in　conjunction　with　Mr。　Wolcott；　attempting　the　use　of　iodine；　bromine；　and　chlorine；　and　at　times　with　more　or　less　success。　　The　difficulty　of　exactly　combining；　the　three　elements　above　mentioned；　in　order　to　produce　a　certainty　of　result　with　harmony　of　effect；　was　the　work　of　many　months；　with　great　labor　and　study；　the　slightest　modification　requiring　a　long；　series　of　practical　experiments；　a　single　change　consuming；　frequently；　an　entire　day　in　instituting　comparisons；　etc。；　etc。

Early　in　the　year；　1842；　I　discovered　a　combination　of　chemicals　（now　known　in　London　as　〃Wolcott's　Mixture；〃　in　hermetically　sealed　bulbs）　of　exceeding　uniform　character；　very　sensitive　to　the　action　of　light；　and　specimens　produced　in　1842…3；　with　this　combination；　will　bear　comparison　with　the　best　specimens　produced　at　this　late　date。

About　the　same　time；　I　discovered　that　however　much　overdone　a　Daguerreotype　might　be；　the　means　were　at　hand　to　save　or　redeem　it。　It　has　long；　since　been　known　to　operators；　that　if　a　plate　be　exposed　to　light　after　being　coated；　unless　it　be　again　coated；　a　clear　and　distinct　picture　could　not　be　obtained　upon　the　same　plate　without　first　repolishing　and　recoating　the　same；　care　being　taken　that　no　light　fall　upon　the　prepared　surface。　　To　prevent　solarization；　coat　a　plate　as　usual；　expose　to　the　action　of　light　any　required　time　（according　to　circumstances）；　say　from　quarter　to　one　half　more　time　than　would　be　required　in　the　ordinary　method　of　procedure；　observe；　before　putting　the　plate　in　the　mercury　box；　place　it　over　the　vapor　of　iodine；　bromine；　or　chlorine；　etc。　　（carefully　excluding　the　light）；　for　a　very　brief　period；　great　care　being　required　to　have　the　selected　vapor　very　much　diluted　with　air；　in　order　to　success。　Many　experiments　will　be　required　ere　arriving　at　satisfactory　results。　Specimens　now　unknown　to　general　operators；　for　harmony　of　effect；　have　been；　and　may　again　be　produced　by　the　method　pointed　out　above。　I　have　found　the　best　general　effect；　and　the　most　certain　result　to　follow　from　the　use　of　the　vapor　of　chlorinebut　this　requires　more　than　ordinary　care。　　I　would；　therefore；　recommend　the　use　of　iodine。　　Thus：　　to　a　few　grains　of　iodine；　add　an　ounce　of　warm　water　（which　will　become　tinged　with　iodine）；　when　cold；　to　half　a　pint　of　pure　water　in　a　new　and　clean　coating　box；　put；　of　the　above；　fifty　drops；　stir　and　mix　well　this　small　quantity　of　iodine　in　with　the　water；　in　ten　minutes　this　box　will　be　ready　for　use。　Great　care　and　judgment　will　be　required　in　the　application　of　this　vapor　to　the　plate；　if　the　plate　remain　over　the　vapor　too　long。　the　developed　picture　will　have　a　faint　and　misty　appearance；　if　not　exposed　long　enough；　the　〃high　light〃　will　be　solarized。　I　have　great　hope　of　the　ultimate　use　of　this　process；　as　it　is　the　only　means　yet　discovered　to　be　enabled　to　secure　specimens　of　extremes　of　light　and　shade；　yet　producing　harmony　of　effect；　and　I　would　call　the　attention　of　the　profession　to　the　fact；　that　a　plate　may　be　exposed　to　the　action　of　light　for　any　length　of　time　（a　thousand　times　longer　than　required　to　act　for　the　lesser　quantity　of　mercury　to　deposit　itself；　or　that　amount　necessary　to　form　a　perfect　specimen）；　and　be　restored　by　the　application　of　any　of　the　vapors　above　mentioned；　remarking　that　for　extremes　for　solarization；　denser　vapors　will　be　required。　　Much　remains　to　be　done　with　this　discovery　to　the　application　of　the　Daguerreotype。



HUMPHREY'S　JOURNAL　OF　THE　DAGUERREOTYPE　&　PHOTOGRAPHIC　ARTS。

The　above…named　publication　is　well　known　as　the　best　and　most　valuable　one　devoted　to　the　Photographic　Science　in　this　country。　Humphrey's　Journal　made　its　appearance　November　1st；　1850；　and　consequently　is　the　first　and　oldest　serial　offered　to　the　Photographic　world。

The　art　of　producing　Portraits　and　Landscapes　by　means　of　Light；　has　recently　taken　a　new　and　enlivening　impulse；　which　will　in　all　probability　lead　to　important　and　interesting　results。　No　practical　Daguerreotypist；　Photographer；　or　amateur；　should　be　without　the　means　at　hand　for　securing　all　of　the　information　upon　this　subject。　　Each　should　be　ready　to　receive　and　apply　the　improvements　as　they　may　be　developed。　In　order　to　accomplish　this；　it　is　a　matter　of　great　importance　to　the　Practitioner　or　Experimenter　that　he　should　have　a　reliable　medium　through　which　he　can　obtain　information。　In　what　source　can　the　inquirer　better　place　his　confidence　than　in　a　regular　Journal；　whose　editor　is　literally　a　practical　person；　and　familiar　with　the　manipulations　necessary　for　producing　Portraits　upon　〃Daguerreotype　Plates；〃　and　upon　glass　and　paper？　Such　is　the　conductor　of　Humphrey's　Journal。

This　Journal　is　published　once　every　two　weeks；　and　contains　all　the　improvements　relating　to　the　Art；　and　is　the　only　American　Journal　whose　editor　is　practically　acquainted　with　the　process　for　producing　Daguerreotypes；　Ambrotypes；　and　Photographs。　The　first　No。　of　Vol。　　X。　is　dated　May　1st；　1858。　　The　terms　（Two　Dollars　per　annum）　are　trifling　compared　with　the　vast　amount　of　information　furnished。

AMBROTYPES。Humphrey's　Journal　contains　everything　novel　which　appears　upon　this　subject；　and　has　already　presented　more　new；　important；　and　original　matter　than　can　be　found　in　any　other　place。

Many　are　the　letters　we　have　received　during　the　term　of　the　last　volume；　in　which　the　writer　has　stated　that　a　single　number　of　Humphrey's　Journal　has　contained　information　of　more　value　to　him　than　〃several　times　the　amount　paid　for　the　entire　volume。〃

Our　resources　have　grown　up　around　us；　and　our　facilities　for　procuring；　as　well　as　distributing；　all　such　facts　and　improvements　as　will　benefit　as　well　as　instruct　all　who　have　the　progress　of　the　Art　at　heart；　are　as　ample　as　they　can　well　be　made。

The　future　volumes　will　be　abundantly　furnished　with　original　writings　from　persons　of　standing　in　the　scientific　world；　and　the　practical　Photographer　will　here　find　a　full　account　of　such　improvements　as　may　from　time　to　time　develop　themselves。

From　the　editor's　long　practical　experience　in　the　Heliographic　Science；　he　will　be　enabled　to　present　the　subject　in　a　plain；　clear；　and　concise　manner。

Read　what　the　Editors　say　of　Humphrey's　Journal：

〃We　have　received　a　copy　of　a　valuable　Journal　（Humphrey's）　published　in　New　York；　which　has　reached　the　18th　number　of　Vol。　　VI。。。。。We　now　have　the　pleasure　of　quoting　from　our　trans…atlantic　coadjutor。〃　Liverpool　Photographic　Jour。

〃Humphrey's　Journal　is　practical　as　well　as　scientific　in　character。〃　American　Journal　of　Science　and　Arts。

〃It　treats　the　subject　knowingly　and　with　force。〃New　York　Tribune。

〃It　is　both　a　popular　and　interesting　publication。〃Mechanics'　Magazine。

〃It　is　highly　useful　to　all　who　practice　'shadow　catching。'〃　Ohio　State　Journal。

〃The　work　is　neatly　gotten　up；　and　contains　many　interesting　varieties　in　this　new　field　of　science。〃Times。

〃It　should　be　hailed　and　encouraged；　not　only　by　Daguerreotypists　themselves；　but　by　every　lover　of　Science　and　Art。〃The　Democrat。

〃We　cannot　too　strongly　urge　all　artists；　and　those　persons　who　feel　an　interest　in　the　Heliographic　Arts　and　Sciences；　to　take　a　copy　of　the　work。〃Sentinel。

〃It　is　indicative　of　talent　worthy　of　the　important　Art　it　is　designed　to　elevate。〃American。

〃This　Art　is　entitled　to　its　own　organ；　which　could　not　have　fallen　into　better　hands　than　those　of　the　editor　of　'Humphrey's　Journal。'〃Transcript。

〃It　is　a　scientific　work　of　interest　and　usefulness。〃　Star　of　the　North。

〃This　Journal　answers　many　points　heretofore　regarded　as　inexplicable。〃　Hudson　River　Chronicle。

〃It　is　rich　with　interest。〃North　American。

〃It　contains　all　the　'Improvements。'〃Delta。

〃It　teaches　us　how　to　take　our　own　portraits。〃Bee。

〃It　will　cultivate　a　taste　for　Daguerreotypes。〃Commercial　Advertiser。

〃It　should　be　in　the　hands　of　all。〃Reveille。

〃It　is　the　Daguerreotypist's　friend。〃London　News。

〃It　should　be　found　in　every　library。〃Evening　Journal。


From　some　of　our　Subscribers

〃Humphrey's　Journal　has　been　the　means　of　saving　much　time　and　money；　for　by　its　instruction　I　have　been　enabled　to　produce　some　of　the　finest　Paper　Pictures　I　have　ever　seen。〃　　W。　P。

〃Don't　fail　to　send　me　the　Journal；　for　I　would　not　be　without　it　for　five　times　the　amount　of　subscription。　It　is　the　only　publication　I　can　depend　upon。〃　　A。　G。　R。

〃Your　treatment　of　the　humbugs　and　humbugging　members　of　the　profession；　is　of　the　most　valuable　importance　to　us　practical　Daguerreans。　　Go　on。　God　speed！