Home >> Photography Theory And Practice >> Silver Iron Printing Papers 627 to Various Processes 691

Photography Theory and Practice

Silver Iron Printing Papers 627
Silver-iron Printing Papers 627. Sepia Papers. " Sepia " Paper (h. Shawcross, 1889), Which Is Prepared By Soaking Thin Translucent Paper In A Solution Containing Iron Ammonium Citrate, Citric Acid, And Silver Nitrate, Is Widely Used For Making Copies From Tracings. Such Copies, In White Lines On A Brown Ground, ...

Silver Print Out Papers 520
Silver Print-out Papers 520. General. We Shall Consider Here Chiefly Those Papers In Which The Sensitive Material Is Silver Chloride Associated With An Excess Of Soluble Silver Salts (nitrate, And Organic Salts, Such As Citrate, Tartrate, Etc.). According As The Printing Is Carried Out In Weak Or Strong Light, The ...

Stereoscopes 826
Stereoscopes 826. Viewing Stereograms With The Naked Eye. By Making The Axes Of The Eye Diverge, Some People Can View Normal Stereoscopic Pairs With The Naked Eye, Provided The Distance Between The Principal Points Is Little Different From The Separation Of The Eves. Such Viewing Is Made Easier By Holding ...

Stereoscopic Projection 857
Stereoscopic Projection 857. Classification Of The Various Methods. The Various Known Methods Of Stereoscopic Projection May Be Classified As Follows— (a) The Images Are Projected One On The Other And Are Selected— (i) By Alternately Cutting Out The Two Pro Jected Beams, With Synchronized Cut-out Of The Individual Viewing Apparatus. ...

Stereoscopy 812
Stereoscopy 812. The Sensation Of Relief. We Have Already Seen (§ 30) That The Two Determining Causes Of The Sensation Of Relief Are The Dissimilarity Of The Two Images Seen Separately By The Eyes And The Variation In The Effort Of Convergence Of The Two Ocular Axes. We Have Also ...

Stripping Varnishing
Varnishing, Stripping, Numbering, Classification, And Storage Of Negatives 477. Varnishing Of Negatives. The Varnishing Of Negatives Ensures Them Against Numerous Accidents. It Is Advisable For Negatives Which Are Required For Large Numbers Of Prints, And Which In Time Become Scratched By Rubbing. Varnishing Is Also Advisable For Negatives From Which ...

Taking Stereoscopic Negatives 837
Taking Stereoscopic Negatives 837. Usual Stereoscopic Sizes. Stereoscopic Apparatus, Consisting Of Two Coupled Cameras, Usually Form The Two Images Of The Pair On A Single Plate Or Film. 2 The Usual Size Of The First Stereoscopic Transparencies Was 85 X 170 Nun. (approximately 31 X 61- In.), The Two Joined ...

Temporary Additive Synthesis 878
Temporary Additive Synthesis 878. Triple Projection. We Have Already Dis Cussed (§ 867) The Principle Of This Method Of Synthesis By Addition Of Lights. In Working The Process One Is Led To Employ For Synthesis Filters Which Are Somewhat Different From Those Used For Analysis. Our Eyes Are Sufficiently Imperfect ...

Testing A Developer 393
Testing A Developer 393. Method For The Comparative Testing Of Two Developers.' The Procedure Generally Adopted By Photographers To Compare Two Developers Consists In Exposing Two Identical Plates Or Films On The Same Subject With The Same Time Of Exposure ; One Of These Is Developed In Each Developer And ...

The Camera Obscura And
The Camera Obscura And Pinhole Photography 36. The Camera Obscura. The Camera Obscura (fig. 12) Appears To Have Been Known At A Very Early Date.' In One Of His Undated Manuscripts, The Celebrated Painter, Engineer, And Philo Sopher, Leonardo Da Vinci, Who Died In 1519, Describes This Phenomenon In The ...

The Carbro Or Ozobrome
The Carbro Or Ozobrome Process 696. Working Methods. In The Carbro Or Ozobrome Process,' Invented In 1906 By T. Manly And Improved By H. F. Farmer, In 1919, A Carbon Print Is Obtained From A Bromide Print, By Single Transfer, Without Reversal Of The Original Bromide Print' As Regards Right ...

The Chief Failures In
The Chief Failures In Negative-making 430. Preliminary Note. The Enumeration Of The Faults Which May Occur During The Various Phases Of The Process Of Negative-making May Be Sufficient To Discourage The Novice In Photo Graphy ; It Has, However, No Other Purpose Than To Allow The Cause Of A Failure ...

The Development Of The
The Development Of The Negative In This Chapter The Subject Is Treated Under The Following Heads: (a) General Principles ; (b) Inorganic Developers ; (c) Organic Devel Opers; (d) Substances Chiefly Used In Inaking Developing Solutions; (e) General Practice Of Dcvelopnent; (f) Various Methods Of Devel Opment ; (g) Tests ...

The Ferro Prussiate Process 622
The Ferro-prussiate Process 622. Industrial Papers For Copying Tracings. Ferro-prussiate Papers And Fabrics Are Used In Considerable Quantities For Making "blue-prints " From Engineers' And Architects' Tracings. They In All Cases Where The Differentiating Reagent Gives A Coloured Precipitate With The Ferrous Salt Only, The Reagent Can Be Mixed With ...

The Lantern Lecture
The Lantern Lecture 8o5. The Lecture Hall. When There Is Occa Sion To Build Or To Adapt A Hall For Lantern Work It Is Preferable To Select A Hall Which Is Much Longer Than It Is Wide, Thus Enabling Advantage To Be Taken Of The Metallized Screens. It Is Obvious ...

The Negative Generalremarks
The Negative : General Remarks On Photographic Negative Processes 190. The Wet Collodion Process. Of The Many Different Photographic Processes Which Were Practised Before The Introduction Of Modern Gelatino-bromide Plates And Films, The Only One Which Is Still Commonly Used Commercially (photo-mechanical Reproductions, Copying Orig Inals For Enlargement, Etc.) Is ...

The Principal Failures In
The Principal Failures In Making Positive Prints On Silver Papers 6i6. Preliminary Note. Before Enumerating Some Of The Failures Which May Occur In The Various Stages Of The Production Of Positive Prints, The Reader Should Realize That The Great Majority Of Failures Are Entirely Due To Mistakes Made, Often Unconsciously, ...

Three Colour Selection 873
Three-colour Selection 873. Three-colour Selection Filters. Formerly Attempts Were Made To Produce Almost Mono Chromatic Filters, Each Transmitting Only A Narrow Spectral Band. It Is, However, A Mistake That Some Groups Of Visible Rays Should Escape Record On One Or Other Of The Three Negatives. Then Use Was Made Of ...

Tones 579
Tones 579. General Considerations. The Emulsion Of Chloro-bromide Papers Is Sufficiently Slow For Working By Yellow Light, But The Light Should Not Be So Bright As When Gaslight Papers Are Being Used. As A General Rule, The Only Tones For Which These Papers Are Used Are Those Comprised Between A ...

Transparencies In Various Tones
Transparencies In Various Tones 574. Warm Tones By Development. Images In Warm Tones Obtained By Direct Development Are Formed Of Colloidal Silver Of Ultra-microscopic Size And Bright Colour, Yellow, Red, Or Purple, Mixed With A Greater Or Lesser Proportion Of Black Reduced Silver Of Microscopic Size. These Images Of Very ...

Various Methods Of Development
Various Methods Of Development 381. Formulae For Developers. Some Photo Graphers Spend Most Of Their Time Testing Successively All The Developing Formulae That They See, Even When They Show But Negligible Differences Irons Other Formulae Previously Tried (differences Of The Same Order As Those Resulting From The Uncertainty Regarding The ...

Various Processes 691
Various Processes 691. Ozotype. A Curious Variation Of The Carbon Process Was Devised In 1899 By T. Manly. This Process, However, Has Been Abandoned Since The Introduction Of The Ozobrome Process Described In Chapter Xliii. A Sheet Of Single-transfer Paper (§ 652) Is Sensitized In A Solution Of Potassium Dried, ...