Why is an Alaskan glacier named after an Ohio farm boy?

Mendenhall’s Gravimeter Precision and Alaska Glacier Namesake

Thomas Mendenhall never set foot in Alaska, yet a massive glacier bears his name.

Born to Quaker parents in 1841, this self-taught scientist rose from no formal education to become Ohio State’s first professor.

By 1889, he led the U.S. Coast and Geodetic Survey, where he fixed the Alaska-Canada border and changed how America measures things.

His portable gravimeter was so precise that scientists called it “the world’s best clock.”

Meanwhile, the stunning Mendenhall Glacier near Juneau stands as a frozen monument to a brilliant mind who mapped our nation’s edges.

From Underground Railroad to Scientific Fame: Mendenhall’s Quaker Roots

Thomas Corwin Mendenhall was born on October 4, 1841, in Hanoverton, Ohio.

His parents, Stephen and Mary, worked as abolitionists who helped escaped slaves on the Underground Railroad.

The family moved to Marlboro, a Quaker community near Akron, in 1852. Young Thomas showed his smarts early, becoming principal of the local primary school at just 17.

He taught himself physics without any college degree, learning complex math and science through hard work and natural talent.

Ohio State Grabbed Him as Their First Professor

The new Ohio Agricultural and Mechanical College hired Mendenhall in 1873 as professor of physics and mechanics, making him the first professor at Ohio State University.

His brilliant mind mattered more than his lack of formal schooling.

Before this job, he built his name teaching at several Ohio schools, including Columbus Central High School.

He married Susan Allan Marple in 1870, and they had their son Charles Elwood in 1872. Ohio State gave him their first-ever honorary doctorate in 1878.

Japan Called Him to Help Modernize Their Science

Edward S. Morse got Mendenhall to join a group of foreign experts who helped update Japan during the Meiji Era.

From 1878 to 1881, he worked as a physics professor at Tokyo Imperial University. He set up a weather station and started Japan’s first regular weather tracking system.

Mendenhall gave public science talks in temples and theaters for regular people.

His work with earthquakes led him to help start the Seismological Society of Japan, bringing modern science methods to a country with frequent tremors.

He Climbed Mount Fuji to Weigh the Earth

Mendenhall turned Japan’s famous mountain into a giant science test. Using a tool called Kater’s pendulum, he checked gravity at sea level and again at Mount Fuji’s top.

The difference let him figure out Earth’s mass very closely, matching what Francis Baily found in England using other methods. Mendenhall also used a large spectrometer to measure solar light wavelengths very precisely.

His gravity checks from different heights created a new way to calculate Earth’s mass, showing his skill for creative problem-solving.

Weather Signals on Trains Started With His Ideas

After coming back to Ohio in 1881, Mendenhall created the Ohio State Meteorological Service.

His smart system of weather signals for trains caught on fast, spreading across America and Canada. The U.S. Signal Corps hired him as a professor in 1884, where he studied lightning patterns and ground temperatures.

He set up America’s first stations made just to watch for earthquakes. In 1886, he moved to Indiana to become president of Rose Polytechnic Institute in Terre Haute.

Washington’s Top Science Job Landed in His Lap

President Benjamin Harrison picked Mendenhall in 1889 to run the U.S. Coast and Geodetic Survey, a top science job in Washington.

His duties grew when he also took charge of the Bureau of Weights and Measures.

From 1890 to 1891, he led the United States Board on Geographic Names, helping make place names standard across America.

His skill with boundaries put him on the first Bering Sea Commission in 1891, studying the drop in seal numbers.

This work set him up for his role on the boundary line survey between the United States and Great Britain from 1891 to 1893.

His Pocket-Sized Invention Measured Gravity Better Than Anyone’s

The Mendenhall Gravimeter changed how scientists measured Earth’s gravity when he created it in 1890. This small device used pendulums to spot tiny changes in gravity with amazing accuracy.

Survey teams carried it to over 340 spots worldwide, making it the top tool for gravity checks. The pendulum inside worked more exactly than the best clocks of that time, earning the nickname “world’s best clock.”

Albert Michelson used this tech to measure light speed, work that helped him win the 1907 Nobel Prize in Physics.

One Order Changed How America Measures Everything

On April 5, 1893, Mendenhall wrote what people now call the “Mendenhall Order” with the Treasury Secretary’s approval.

This big change officially switched America from British measurement standards to the international meter and kilogram. For the first time, all U.S. measurements came from metric standards.

This quiet shift meant American inches, feet, and pounds now came from metric units rather than physical British standards.

Throughout his life, Mendenhall pushed for America to fully use the metric system, seeing it as more logical than our old measurements.

A Glacier Bears His Name Though He Never Saw It

Mendenhall took charge of marking exactly where Alaska ended and Canada began through joint survey work in the 1890s.

The boundary came from a vague 1825 treaty between Russia and Great Britain, made when fur traders were the main visitors.

The rough land made normal surveying impossible, so teams used a new method called photographic triangulation.

Canadian surveyor William Ogilvie took pictures of Mount McGinnis in 1894 as part of this peak-to-peak mapping project.

Surveyors named both Mendenhall Valley and Glacier near Juneau after him in 1892.

He Counted Word Lengths to Solve Shakespeare Mysteries

After leaving the Coast and Geodetic Survey in 1894 (protesting political appointments to technical positions), Mendenhall became president of Worcester Polytechnic Institute.

He served there until 1901, but his scientific curiosity extended beyond his day job. In 1887, he published one of the first attempts at stylometry, analyzing writing styles with math.

He counted word lengths in Shakespeare’s works and compared them to other authors, trying to settle debates about who really wrote those famous plays.

His health forced him to resign from Worcester in 1901, and he spent the next decade recuperating in Europe, showing how his analytical mind tackled problems from physics to literature.

His Final Fight: Keeping Football Stadiums Small

Mendenhall returned to America in 1912 and settled in Ravenna, Ohio, for his retirement years. Ohio State University appointed him to their Board of Trustees in 1919, bringing his career full circle.

He successfully pushed to close Ohio State’s College of Homeopathic Medicine, believing it didn’t meet scientific standards.

His most famous battle came when he argued against building such a large football stadium on campus.

Mendenhall insisted that limiting Ohio Stadium to 45,000 seats made more sense since it would “never fill” to the planned 63,000 capacity.

He lost that fight, and the stadium regularly sells out today. Mendenhall died on March 23, 1924, in Ravenna and was buried in Madison, Wisconsin.

Visiting Mendenhall Glacier Visitor Center

The Mendenhall Glacier Visitor Center at 6000 Glacier Spur Road in Juneau charges $5 for ages 16+ during summer (federal passes accepted).

You can visit Sunday through Friday from 10am-5pm, but they’re closed Saturdays.

Watch a 15-minute film about the Tongass National Forest and glaciers to learn about Thomas Corwin Mendenhall’s scientific work and the Alaska-Canada boundary survey.

Don’t bring food outside from April-November because of bears.

This article was created with AI assistance and human editing.

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