Battery Howe-Wagner was a combined 19th century mortar battery that was deactivated in 1920. The battery was originally armed with 82 pieces of M1886 and M1886M mortars.
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Source
Text: TracesOfWar
Photos: TracesOfWar.com
Kent, Matthew W., Harbor Defenses of San Francisco - A Field Guide 1890 to 1950, p. 22-24