Proof sheets

Abzug, m. hood, fume cupboard scum, dross, specif, a scum on molten lead, sharp slag outlet, discharge, drainage, drain vent drawing off deduction proof sheet, proof py (Photog.) print. 

If a proof sheet is prepared, critique the photos appearing on the proof sheet, in terms of light-dark contrast. 

One area of darkroom procedure that is conducive to standardization is making proof sheets. While it is not necessary to standardize on making a proof sheet doing so will streamline your workflow, help determine if your system is working properly, camera, meter, film and developer, and enable you to accurately read step wedges when making interpositives. The method is known as proofing for maximum black. 

With consistency in mind, choose a lens and negative carrier to use for all future proof sheets. It does not matter which you choose—just be consistent. 

With consistency in mind, raise the enlarger head to a comfortable working height. This should be about the height to make an 11 X 14 inch print. If the enlarger column has a scale on it make a note of this height and use it for all future proof sheets. If it does not have a scale, then mark the column with a Sharpie or tape. 

If there is no maximum black within the initial test open the lens one stop and retest. If there is still no maximum black give an overall first exposure between 10 and 16 seconds, cover the first strip and continue with 2 second exposures. If this fails to produce a maximum black then switch to using 3 second exposures instead of 2 or use a faster paper to make your proof sheets ... 

In certain cases use was made of the proof sheets of the fourth edition of Landolt and Bdrnstein, which is to appear in autumn of this year. I am much indebted to the courtesy of the publishers of the tables, Julius Springer, who, with the permission of the editors, Geheimrat Bdrnstein and Professor W. A. Roth, were kind enough to place the proofs at my disposal. 

In conclusion, I would express my thanks to Sir William Ramsay, whose guidance and counsel have been constantly at my disposal and to my colleagues, Dr. T. Slater Price and Dr. A. McKenzie, for their friendly criticism and advice. To Messrs. J. N. Friend, M.Sc., and W. E. S. Turner, B.Sc., I am also indebted for their assistance in reading the proof-sheets. 

I desire to offer my warmest thanks to Professor Andrade for suggesting an English edition of my book. I also owe my thanks to Mr. Fisher, who prepared the translation in the first place Professor Andrade, Professor Appleton and Dr. Curtis, who read it over and finally to Dr. Hartree, who revised the translation, read the proof-sheets, and made many helpful suggestions for elucidating certain points. I also offer my sincere thanks to the publishers for the excellent manner in which they have produced the book. 

In conclusion, I would express my indebtedness to the text-book on Physical Chemical Measurements by Ostwald and Luther, to which all advanced students may be referred and I would also thank my colleague Dr. A. du Prd Denning, not only for his assistance in reading the proof-sheets, but also for the friendly criticism which he was good enough to offer. 

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