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Encyclopedic Dictionary of Photography

Thiosinamine
Thiosinamine (formula Cs Nh, H,, Synomyns Orless And Odorless Crystals Easily Soluble In Water And Alcohol. Liesegang, In 1883, Pointed Out The Value Of The Substance As A Fixing Agent. It Was, However, Very Expensive. Recently The Price Has Been Very Much Reduced. It Is Also Valuable As A Clearing ...

Toning Bath
Toning Bath. Stock Solution As Above I Fluid Drachm Ordinary Water Up To 2 Fluid Ounces Nitric Acid 1 Or 2 Drops In Winter It Is Preferable To Use Warm Water To Bring The Temperature To About 8o°f. It Must Not, However, Be Over-heated; Yellow Half-tones Will Be The Result. ...

Transferrotype
Transferrotype, Toning.—warm Tones, Ranging From A Rich Brown To A Brilliant Red, May Be Obtained With Transferrotype Paper, After Fixing And Transferring (the Image Will Not Transfer After Toning) By The Following Method : Two Solutions Are Prepared. Transfers.—there Are Several Photographic Processes By Means Of Which Images Can Be ...

Vanadium
Vanadium (symbol V; Atomic Weight 51.2).—the Sensitiveness To Light Of The Vanadium Compounds, Which The Brothers Lumiere Have So Thoroughly Studied, And Which Gibbons Records In The Chemical News, 1874, P. 267, Has, I Believe, Not Much Practical Importance In Connection With Positive Printing. Those Vanadates Which I Myself Investigated ...

View
View Finder.—a Little Instrument Used In Instan Taneous Photography. In Photographing Rapidly Moving Ob Jects It Is Necessary That Some Means Should Be Employed To Enable The Operator To See Whether Or Not The Object Will Appear In Its Proper Position On The Plate. With A Finder Attached To The ...

Vision
Vision (lat. See).—lit. The Faculty Of Seeing; That Power By Which We Perceive The Forms And Color Of Objects Through The Sense Of Sight. The Study Of The Eye, And The Analogy It Bears To The Photographic Camera And Lens, Is One That Is Full Of Interest To The Photographic ...

Warnerkes Process
Warnerke's Process. —a Simplified Collotype Process, Invented By M. Raymond, Of Paris, And Introduced In This Country By Warnerke. The Printing Surface Employed Is Vegetable Parchment, Coated With A Suitable Gelatine. This Is Sensitized In A Bichromate Bath, And Then Squeegeed On To A Talced Glass. When Dry, It Can ...

Water
Water (formula, Oh,).—a Clear Colorless Liquid Devoid Of Taste And Smell And Possessing A Neutral Reaction. Pure Water Is Tasteless And Colorless, Except In Thick Layers. It Boils At Ioo C. (212 Fahr.), And Becomes Solid At O C. (,32 Fahr.) It Is Undoubtedly One Of The Most Important Substances ...

Weights And
Weights And Measures.—the Confusion Existing In The English System Of Measure Ment Is, Without Doubt, Very Great. All Solid Chemicals Are Sold By Avoirdupois Weight, While Most Formulm Are Written In Apothecaries' Weight. Various Suggestions Have Been Offered To Remedy This State Of Things. The Adoption Of The French Metric ...

Wortleys
Wortley's Process.—a Dry Collodion Process Invented By Colonel Wortley, In Which The Following Is Used As A Preservative : X Rays.—one Of The Most Remarkable Discoveries Of The Present Century Was That Made By Prof. Roentgen. He Discovered That Certain Rays (which For Want Of A Name He Calls X ...

Yellow
Yellow Stain.—a Yellow Stain Is Often Produced Upon Negatives Caused By Insufficient Fixing. This Is Very Often Difficult To Remove. One Method Recommended By Mr. Drake Is As Follows : Soak The Plate For Five Minutes In Clean Water, Meanwhile Make A Solution Of Iodide Of Potassium, Twenty Grains To ...

Zoellners
Zoellner's Process.—an Iodide Of Starch Process For Reproducing Drawings, Manu Scripts, Etc., Invented By Dr. F. Zoellner, Of Berlin.* Thin And Smooth Paper Of A Uniform Texture Is First To Be Sized With Starch. If Paper Which Was Sized With Starch In Its Manufacture Is Used, The Operation Is, Of ...