The Mystery of the Lehmer Model

By Robert T. Rhode
Published on November 1, 2002
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Seven years ago, I bought a wooden model of an agricultural
traction engine at an antique mall in Lebanon, Ohio, and thereon
hangs this tale.

About 20 percent of the model’s parts were missing, and I
wanted to recreate them to restore the model. First, I had to learn
what make of engine it was. It bore a resemblance to a Wood, Taber
& Morse portable, manufactured in Eaton, N.Y., but it had an
extra shaft running in front of the firebox beneath the boiler. I
was stumped. I called the antique dealer to ask where he had
acquired the model. He replied that he purchased it at a flea
market. Since I could not trace the engine’s origins, I
postponed restoration indefinitely.

Wooden model of Lehmer’s traction gear on a portable engine
with a boiler 14 inches long. This is the model that launched
Robert T. Rhode’s investigation of Isaac Lehmer and his
traction design.

Last year, I was paging through Jack Norbeck’s Encyclopedia
of American Steam Traction Engines, and my gaze became riveted to a
photograph on page 42 in the section of Jack’s book devoted to
portable engines. I recognized the picture as the inspiration for
my model, extra shaft and all. Jack’s caption contained
intriguing details, which he later told me had come from Raymond
Laizure, publisher of The Stumptown Steamer. The engine featured in
Norbeck’s book was indeed a 6 HP Wood, Taber & Morse
portable, but, as Norbeck’s caption informed me, in 1875, Isaac
Lehmer had a ‘set of patterns made from his own designs for the
attachments necessary to make it a steam traction engine.’

I contacted Larry Jones, curator of agricultural exhibits at the
Smithsonian Institution, to inquire if he had additional
information on the Lehmer traction engine conversion package. He
called my attention to a photograph on page 7 of Floyd Clymer’s
Album of Historical Steam Traction Engines. I noticed that the
engines in the pictures in Norbeck and Clymer were similar but not
the same. Both resembled my model, yet all three differed slightly
from one another. Intriguingly, the Clymer photo showed the words
‘Lehmer Traction Gear’ on the engineer’s platform. It
was becoming clear to me that Lehmer had formed a company to sell
his traction conversion kit. Research brought to light the
fascinating story.

Lehmer and Baumgartel’s Inventions

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