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90 IV. MAKING 16-MM ORIGINALS
the exposures indicated. Develop standard time (6 minutes)*, return original log sheet, retain carbon copy in the Laboratory file. ' '
If the lamp originally installed in the machine was burned out prior to this test, it is advisable to follow the recording procedure of section (2) above for at least two lamps.
Send the film to the laboratory with the original and first carbon copy of the log sheet taped across the film can. Mark the folded sheets "Exposure Test." Retain the second carbon copy. In sending written instructions to a laboratory, it is good practice to make them so clear, concise, and complete that the laboratory man can follow the written instructions with no other knowledge of the conditions under which the films were exposed.
Developing the Exposure Test
Upon receipt of the exposure test film, the laboratory, following your instructions, develops it at the standard time* of 6 minutes. After development, the film is turnd over to the laboratory control department where the log sheets and instructions are checked against the film and the necessary density measurements made. The data is then entered on the original log sheet for return to you; the film is ordinarily not returned unless you ask for it, since it is of no further value. The carbon copy of the log sheet may be retained in the laboratory technical file for future reference in connection with your work.
Plotting the Results of the Exposure Test
From the densities marked on the log sheet for lamp #1, prepare a curve sheet of lamp current vs. density as per Figure 4; the scale shown is the smallest that should be used.
Plot the points for lamp #1 first; the plotted points should form a straight line. Draw the straight line with a ruler. The point at which this diagonal line intersects the 1.90 density line is the Reference Lamp Calibration Current for the emulsion number and the lot number of the film used. Place a piece of white adhesive tape across the left half of the black case of the lamp ammeter located on the amplifier (just below the meter scale) ; mark this current reading on the tape together with the word "REFERENCE" and the emulsion and lot number of the film used.
On the same curve sheet, plot the point for lamp #2. Through this
* ' ' Standard ' ' development time will have a different value for each developer in each laboratory.