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A Draft of History

The Magnus Brewery

Circa 1905 (Courtesy OSA/Marlin Ingalls)

Christian Magnus

A German immigrant who led the Magnus Brewery to great success. (Image courtesy of OSA/Marlin Ingalls)

Sanborn Fire Insurance Plat

The layout of the Magnus Brewery, circa 1889. (Image Courtesy OSA/Marlin Ingalls)

C. Magnus, Proprietor

This trade/advertising card for the Eagle Brewery was given away at taverns. (Image courtesy OSA/Marlin Ingalls)

Go for the Gusto

Magnus advertising card promoting the popular “free lunch” that was available at many taverns. (Image courtesy OSA/Marlin Ingalls

Magnus advertising card promoting the popular “free lunch” that was available at many taverns. (Image courtesy OSA/Marlin Ingalls

Sinkhole

This sinkhole opened up near an off-ramp to I-380 in downtown Cedar Rapids.

Inside the Beer Caves Today

Past attempts to fill the caves have left piles of rubble. Photo by Marlin Ingalls

Skilled Craftsmanship

Note the barrel-vaulted ceiling, still intact and structurally sound today. Photo by Marlin Ingalls

Exploring

Marlin Ingalls from the Office of the State Archaeologist briefly went into the caves and took photos. Photo by Marlin Ingalls

Beer Caves

The caves have been picked clean of artifacts. Photo by Marlin Ingalls

Electromagnetic Terrain Conductivity Meter

Zach Demanett wields the EM-31 (electromagnetic terrain conductivity meter) near I-380 in downtown Cedar Rapids.

Electromagnetic Terrain Conductivity Meter

Electrical Resistivity (ER)

Pink flags marked exact starting and ending points for each geophysical survey line.

Modeling the Subsurface

Electrical resistivity detects open air under the earth’s surface, which is more resistive electrically than the surrounding earth.

Modeling the subsurface.

Geophysics

Electrical resistivity provides a model of how the subsurface responds to electrical charge.

Electrical resistivity provides a model of how the subsurface responds to electrical charge.

Safety

The Iowa DOT ensured that the IGS team had the proper safety equipment, including signage, cones, reflective vests, etc.

Winter Arrived Early

The light dusting of snow caused no problems for the researchers (Zach Demanett, pictured) or their geophysics equipment.

Last modified on December 9th, 2014
Posted on December 9th, 2014

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