FOMMX data collection follows the principles and terminology of Miller (1933).

Miller used a data-collection spreadsheet preprinted with rows and columns (p213). When a signal occurred, Miller estimated the interferometric fringe shift and called it out. An assistant recorded that number on the spreadsheet.

As the interferometer turned through one revolution, the numbers were entered in one row. The sound signal occurred sixteen times per revolution, and the data for each occurrence was recorded in the corresponding column.

The following list describes the data structure and timing used in FOMMX.

• Data Collection File: 1 Day.
• Sheet: 30 minutes, 48 per Day
  • (A sheet is analogous to Miller's sample data collection sheet.)
• Row, Turn: 1 minute, 360˚ per Turn. There are 30 Rows and Turns per Column and Sheet.
  • (A Turn is one full cycle of rotation of interferometer arms.)
  • (A Row is a horizontal set of cells.)
• Column: 2 seconds, 12˚ per column. There are 30 Columns per Row and Turn and Sheet.
• Cell: A single number. There are 30 cells per row and 30 cells per Column.
• Reading: 0.23 seconds, 4.35 per second. Miller had one reading per cell.
  • (A Program reads a set of values from electronics and stores them.)
  • Readings per hour 15,660.
  • Readings for 12,000 hours in 2020, 2021: 187,920,000.