A time and frequency-domain analysis is made of the effects of averaging and sampling methods used for constructing magnetic-observatory hourly data values. Using 1-min data as a proxy for continuous. geomagnetic variation. we construct synthetic hourly values of two standard types: instantaneous "spot" measurements and simple 1-h "boxcar" averages. https://www.roneverhart.com/DeMarini-2019-Voodoo-One-Balanced-10-2-5-8-USA-Baseball-Bat-28-18-oz/