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George M. Katz
Consultant Engineer 15 Stone Ave., Brooklyn 33.

AMA Arch Ophthalmol. 1958;59(5):805-806.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor:

—Dr. Drohocki's anxiety to justify his instrument unfortunately obscures the fundamentals of the problem.

There are two basic methods of displaying the integral of a potential.

1. Assume a fixed time interval and note the amplitude rise (proportional to the integral) in this fixed time interval. At the end of the time interval, the amplitude is returned to zero and the process is repeated. Therefore, a larger amplitude indicates a greater integral.
   
2. Assume a fixed amplitude of integration and measure the time to reach this amplitude. When the fixed value is reached, a pulse is generated and the process is repeated. Therefore, a shorter interval between pulses indicates a greater integral.
   

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