We have from time to time printed articles in regard to the proper use and care of the Eastman Plate Tank and we wish to emphasize a few of the more important points in the following paragraphs.

In general use the Eastman Plate Tank has proved to be a great convenience - a great time saver and a quality producer.

Negatives developed in the tank are clean and clear, possessing fine grain and perfect gradation, but the tank, like every device or bit of apparatus employed by the photographer, must be used intelligently and properly if the best results are to be obtained.

A most important point in the use of the tank is cleanliness. The tank must be kept clean. Using it repeatedly without cleaning allows a precipitate or deposit to form on the sides and bottom of the tank and on the cage. This deposit is harmful and when an excess has accumulated it affects the development, causing streaks or spots and a chemical veil or fog which gives the plates the appearance of having been undertimed.

When plates appear fogged and flat, weak and undertimed, or when streaks and spots appear, it is generally due to an unclean tank.

To clean the tank scrub it out with washing powder (powdered soap) and warm water. One photographer successfully uses a weak solution of acetic acid for cleansing the tank - about eight parts of water to one part of 25% acetic acid. This solution is poured into the tank, the cage is placed in position and the tank cover put on and the whole shaken up thoroughly. The tank is then rinsed with clear water and is ready for use.

When we say keep the tank clean we do not say clean it every time it is used, for that is unnecessary. An occasional cleaning is all it needs. Use the tank and when a deposit of a grayish color is noticeable remove it by cleaning as suggested.

Other causes of non-success are the use of impure chemicals and failure to carefully observe the temperature of the developer and the time of development.

Time and temperature are the two factors which determine correct tank development, providing the tank is clean and the developer is made up of pure, active chemicals.

Thus it will be seen that for complete success in the use of the Eastman Plate Tank four conditions must work in harmony - time, temperature, cleanliness and chemical quality.

Time is taken care of by the use of the indicator on the front of each tank in connection with the use of a watch or clock. An alarm clock can be used to advantage. For example, it is twenty minutes to four when the loaded plate cage is immersed in the tank and the time of development is to be twenty minutes. Wind the alarm and set it at four o'clock. The ringing of the alarm announces the completion of development.

Temperature is taken care of by the convenient Eastman Thermometer made specially for use with the tank and sold by your dealer.

Cleanliness is taken care of by an occasional tank cleaning.

Chemical quality is assured by the use of C-K tested chemicals.

Eastman Permanent Crystal Pyro and Eastman Sodas are pure and active - are tested and right in every way before they receive the C-K tested chemical seal. When ordering chemicals for photographic use specify C-K tested and look for this seal on the label:

Low Tones

A brother picture maker dropped in for a chat the other day, and in the course of our conversation took exception to some of the exceedingly low toned work featured by some of the craft.

These sort of pictures, he said, remind me of the story of a wealthy merchant who employed an artist to paint a panel on one of the walls of his new home, representing the Israelites Crossing the Red Sea. The painter worked for many days in the closed room, and atlast announced that the picture was finished. When the merchant looked at the wall he saw nothing but a sombre mass of dark red. "What is this?" he asked. "The Red Sea," replied the artist. "But where are the Israelites?" "They have passed over." "And the Egyptians?" "Gone under."

I note in some of the recent magazines that a scientist is advancing the theory that the action of light when it strikes the sensitive plate during an exposure produces an explosion of the small grains of silver bromide. I am not in a position to argue this question, but I do know of explosions that have been caused when the boss of the place saw the results of some exposures.

Edmund Clarence Stedman, Poet Banker.

Edmund Clarence Stedman, Poet-Banker.

Pirie Macdonald. Phtographer-Of-Men New York.

From an Artura Iris print.

Theo. N. Vail., Pres. Western Union Telegraph Co.

Theo. N. Vail., Pres. Western Union Telegraph Co.

Pirie Macdonald. Phtographer-Of-Men New York.

From an Artura Iris print.