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Home arrow Archives   The American Surveyor     

Book Marks: Burt's Solar Compass: Its Conception, Development, Manufacturing, Marketing and Daily Use by Robert C. Miller Print E-mail
Written by Jack Owens, LS   
Friday, 01 July 2011

A 211Kb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

Experience with navigational trigonometry in high school led Robert Miller to a lifelong interest in the astronomical triangle and the equipment used in defining its values. A broader interest in the history of technology and continuing research led him to the work of 19th century Philadelphia survey instrument maker William J. Young. Many of Young's letters had been preserved in the William A. Burt family records at a research library in Michigan. Burt's invention of the solar compass overcame the problems of local attraction that affected the readings of a magnetic compass in an area rich in mineral deposits. Miller's studies revealed that later accounts of Burt's invention written late in the 19th century did not seem to reflect some of the facts he had been uncovering in his research, or presented apparent fabrications. He therefore began writing a more accurate account of the invention of the instrument that would define the direction for much of the surveys of the Public Land Survey System.

Miller presents the development of Burt's invention from words taken from actual documents contemporary with the history as it unfolded, eschewing speculation as much as possible. He is careful to note when making assumptions necessary to fill in gaps in the record and tie documents together.

The story highlights the interaction and collaboration between the inventor, William A. Burt, and William J. Young, the survey instrument maker chosen by Burt to make both versions of his solar apparatus (the first version was called the variation compass) that would readily determine the true meridian for the surveyor.

Burt's talent for invention is evident. He had earlier sought a skilled tradesman to produce his first patented device, the typographer, considered by most authorities to be the first typewriter. It is not hard to conclude he wanted to obtain the best survey instrument maker for his second invention, a more complicated and intricate device, but Miller doesn't make such speculation. Following a biographical sketch of both men, he begins with Burt's first written complaints about local attraction affecting his laying out of public land survey townships in Wisconsin. Burt was as frustrated as other surveyors by the problem but determined to do something to over come it. Seeking someone who could produce his solar apparatus for determining the true meridian that could be attached to a surveyor's compass, Burt traveled to Philadelphia to seek out Young, inventor and patent holder of an improved surveyor's compass that is now considered the forerunner of the first transit. John Mullett, another Deputy Surveyor and one of Burt's good and lifelong friends, had earlier bought one of Young's improved surveyors compasses. Burt was a mill builder and likely recognized the quality, good design and workmanship in Young's instrument.

The account stretches from Burt and Young's first collaboration and continues over the next 30 plus years. As fate would have it, Burt did not make much money from his clever invention. Miller gives some of the accounting of the government's failure to recognize and pay Burt a rightful amount for the order it brought to the Public Land Survey System.

As a surveyor, I only disagree with Mr. Miller on one issue. He notes a shortcoming of the variation compass in which the variation (magnetic declination) could change between the time the meridian was determined and the compass turned to obtain any other bearing by the needle. This was not the type of local attraction which frustrated Burt and other surveyors. Such a type of rapidly changing location attraction would render a compass useless for determining direction. This was the type he encountered with his 1844 discovery of iron ore in the Upper Peninsula of Michigan. By then he was using the improved solar compass, the final version of his invention.

The solar compass is an immediate mechanical solution for solving the P-Z-S triangle (the astronomical triangle that first drew Miller's attention so many years earlier). Even John Herschel, whom many thought the greatest English mind since Newton, gave Burt due credit for conceiving such a device. The solar compass, and its successor the solar transit, were used to lay out much of the Public Land Survey System, especially west of the Mississippi River. BLM surveyors report both were regularly used in BLM surveys up until the 1960s. As one who has retraced some of the lines laid out by the solar compass, it worked well achieving the accuracy attainable with the altitude method incorporated into its design and functioning.

At 135 pages, Burt's Solar Compass is compact but thorough. For anyone who enjoys the linking of original documents with surveying history, I recommend it. A companion CD provides transcribed copies of many of Miller's sources that history buffs will appreciate. The book may be ordered from This e-mail address is being protected from spam bots, you need JavaScript enabled to view it for $30.

Jack Owens has been surveying for 45 years and has been licensed in seven states. He has served on the Michigan Society of Professional Surveyors Board of Directors, the MSPS Institute, teaches the Michigan Licensing Review, and has been a re-enactor for 23 years.

Book Info: Burt's Solar Compass: It Conception, Development, Manufacturing, Marketing and Daily Use
Author: Robert C. Miller
Specs: 135 pages. $30.
Publisher: Lansing, MI: Michigan Society of Professional Surveyors Institute, Spartan Printing, 2010.

A 211Kb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

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