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![Woman operating Old Brass Brains, the mechanical tide computer that producedtidal predictions, sunrise and sunset tables, moonrise and phase of the moontables for thousands of locations around the globe cgs02786.jpg Woman operating Old Brass Brains, the mechanical tide computer that producedtidal predictions, sunrise and sunset tables, moonrise and phase of the moontables for thousands of locations around the globe](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs02786.jpg?itok=qBITgf-3)
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Woman operating Old Brass Brains, the mechanical tide computer that producedtidal predictions, sunrise and sunset tables, moonrise and phase of the moontables for thousands of locations around the globe. This was critical to combatoperations. (Image credit: RADM Paul A. Smith, C&GS; (dec.), WW II Collection; NOAA Central Library Historical Collections)