Chlorate of Potassium

(See Potassium Chlorate.)

Chloride of Calcium

(See Calcium Chloride.)

Chloride of Gold

(See Gold Chloride.)

Chloride of Lime

(See Lime Chloride.)

Chloride of Mercury

(See Mercurous Chloride.)

Chloride of Platinum

(See Platinum Chloride.)

Chloride of Potassium

(See Potassium Chloride.)

Chloride of Silver

(See Silver Chloride.)

Chloride of Sodium

(See Sodium Chloride.)

Chloride of Zinc

(See Zinc Chloride.)

Chloride Paper

Paper coated with a gelatino-chloride emulsion.

Chloride Plates

Plates with a chloride of silver gelatin emulsion and are used for lantern-slides and transparencies.

Chlorine Water

Clear, pale, greenish-yellow liquid. Used as a hypo eliminator.

Chloroform

CHC13.

Clear, colorless, highly refractive, heavy liquid with characteristic odor; sweet taste. Used as a solvent of India rubber, amber and other gums.

Chloroplatinite of Potassium

(See Potassium Chloro-Platinite.)

Chromatic Aberration

(See Aberration Chromatic.)

Chrome Alum

(See Alum Chrome.)

Chrome Yellow

(See Lead Chromate.)

Cinematograph

An apparatus for projecting a series of slightly different photographs of a subject, taken on a continuous length of film, in very rapid succession.

Circle

To find the area of a circle, square the diameter and multiply by .7854. To find the circumference of a circle multiply the diameter by 3.1416. To find diameter, see Diameter.

Citric Acid

(See Acid Citric.)

To Clean Bottles

(See Bottles, To Clean.)

Clearing Solution

(See Solution, Clearing.)

Cloud Negatives

Cloud Shutter

(See Shutter, Cloud.)

Coagulate

To clot or curd, changing to a semi-solid state without evaporation or crystalization.

Coating

A synonymous term used for the emulsion employed on plates or paper.

Cockling

To shrink, pucker or wrinkle. Prints may be prevented from cockling by adding a little glycerin to the last water when washing.

Coins as Weights