To the progressive photographer this means the opening up of a new and highly profitable field - and likewise a pleasant advertisement from the daily round of indoor studio work as much of this class of work has to be made in the open. The principal requisite is ideas - subjects and surroundings are to be found everywhere.

Good selling ideas simply and forcibly presented by means of good photographs will find a ready market amongst the thousands of manufacturers who are seeking new and better ways to advertise their products.

In our own publicity work we do not by any means confine ourselves to the use of the prize winning pictures but after each contest have purchased a number of the pictures submitted outside of the prize pictures.

There is an increasing interest in this class of work and the Kodak Advertising Contests have, while supplying our advertising with forceful pictorial arguments, helped to stimulate this interest. They have, therefore, been mutually helpful. They have broadened the field of photographic effort, have helped many photographers to better incomes. For your interests and our own they are to be continued.\ "Enlarging a Booklet of Suggestion for the Professional. '' Paves the way to increased profits.

A copy gratis at your dealer's or from us by mail. Tank Pointers (Second Article) By One Of The Staff Of The Eastman School Of Professional Photography

In my previous chat with you on tank development I stated that it was a comparatively easy matter to maintain the correct degree of temperature during the period of development, and that a variation of three or four degrees at the end of that period would show no appreciable difference in the quality of the negative. This statement must not, however, be construed to mean that the absolutely correct degree of temperature at the start is not important. If you start with the temperature three or four or five degrees from normal, this difference continuing all through the prolonged development will make a big difference in the result. Correct temperature is most important - you must see that the temperature is exact to a degree, and the only way to determine this is to use a thermometer - testing it with your hands or fingers will not do.

Experiment has demonstrated that negatives will with our formula attain the full normal density in thirty minutes at 65 degrees Fahd twenty-five minutes at 70 degrees Fahd. thirty-five minutes at 60 degrees Fahd being practically a minute to a degree, either way, within certain limits from normal.-

We recommend thirty minutes development at 65 degrees, as this insures normal and uniform results. Here is a little incident that may bring home to you one of the conveniences of the tank: you are in the dark room and have just started to develop a tray full of plates; some one enters the room outside and you get just a little bit nervous because you imagine it is some one with money out there waiting for you, so you step to the dark room door and say, "will be out in a minute," but you are so anxious to get out that you stop development before you should, and later have some under-developed plates to fix up. Now with the Eastman Plate Tank it only takes a minute or two to start development, and then if necessary you can leave your plates with perfect safety. An acquaintance of mine told me that on one occasion he had just loaded his tank when the telephone rang. At the other end of the wire was a brother photographer down the street who wanted him to come over to his studio to meet another gentleman who could only be in town half an hour. So he just tucked the tank under his arm and made his visit. After a time he looked at his watch and said, "Can I use your fixing bath?" He was told "why certainly," so he placed the plates in the fixing bath and continued his visit, and when he left he returned them to the tank and took them back to his own studio for washing.

children photo

To test the latitude of tank development I have made exposures on the same subject and same lighting from one-half second to eight seconds, developed them all together and obtained satisfactory printing negatives from each.

I have had people come to me and say, "I have used the tank exactly according to instructions, but my negatives are too thin." Nine times out of ten I find that they have been using carbonate of soda of unknown quality and so impregnated with impurities as to make their developer too weak in carbonate, so if this is your trouble either use a greater proportion of carbonate or, the best way, use Eastman Carbonate, which tests 98 per cent, pure.