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James Duncan Graham

James Duncan Graham is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand James Duncan Graham rather than just read about it. In short: James Duncan Graham (April 1, 1799 – December 28, 1865) was an early member and founder of the Corps of Topographical Engineers who engaged in many topographical exercises. A topographical engineer, he directed the re-survey of the Mason–Dixon line, and served on the boundary commissions between the United States and Canada and between the United States and Mexico.

James Duncan Graham — main illustration
James Duncan Graham — illustration

Key takeaways

  • James Duncan Graham belongs to engineering; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect James Duncan Graham to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of James Duncan Graham from memory before moving on to harder problems.

Reference excerpt

James Duncan Graham (April 1, 1799 – December 28, 1865) was an early member and founder of the Corps of Topographical Engineers who engaged in many topographical exercises. A topographical engineer, he directed the re-survey of the Mason–Dixon line, and served on the boundary commissions between the United States and Canada and between the United States and Mexico. He also supervised harbor improvements on the Great Lakes, and documented the lunar tide there.

Early and personal life James Duncan Graham was born on April 1, 1799, in Prince William County, Virginia, to parents William and Mary Campbell Graham. He attended the United States Military Academy from June 19, 1813, to July 17, 1817, when he graduated, and was promoted to third lieutenant in the artillery corps. He worked as an adjunct at the academy from October 12, 1817, to February 10, 1819, during which he was promoted to second lieutenant. In 1828, he married Charlotte Meade (July 9, 1803 - June 13, 1843), the daughter of merchant Richard W. Meade and sister of Civil War general George Meade. Their sons would serve in the military as well, William Montrose Graham eventually becoming a Major General and James D. Graham Jr. a Commander in the U.S. Navy. He married twice, to Charlotte Meade and after her death, to Frances Wickham in 1857.

Early career (1819–1850) Graham was on Stephen Harriman Long's exploration of areas acquired in the Louisiana Purchase, from 1819 to 1821. He was on topographical duty from January 14, 1822, to January 15, 1829; and then on surveys in Vermont during 1829. Graham then worked on railroad surveys on the Winchester and Potomac Railroad in Virginia in 1831 and 1832, and later in Alabama, Florida, and Georgia from 1836 until 1837. During the Second Seminole War, Graham served under Major General Thomas Jesup, who commanded American troops in Florida. Graham then was involved in reconnaissance and surveys for military defenses in Missouri during 1838. He served on a Court of Inquiry at St. Louis, in 1838–1839. He was on tour of inspection of harbor improvements on Lakes Ontario and Champlain in 1839. Graham was astronomer for the United States, working for the joint demarcation of the boundary between the United States and the Republic of Texas, in 1839–1840. He served as commissioner for the Survey and Exploration of the Northeast Boundary of the United States from 1840 to 1843. In 1840, he was elected to the American Philosophical Society. Graham next was head of the Scientific Corps and principal astronomer for the joint demarcation of the boundary between the United States and Canada, under the Treaty of Washington, from 1843 until 1847. That year, he was made a brevet lieutenant-colonel, for "Valuable and Highly Distinguished Services, particularly on the Boundary Line between the United States and the Provinces of Canada and New Brunswick". He worked on remaking maps of the Webster–Ashburton Treaty, that had been destroyed by fire, from 1848 to 1850, and 1852 to 1853.

Later career (1850–1865) Graham was on the survey of the Mason–Dixon line, from 1849 to 1850. During 1850 and 1851, he was the principal astronomer and head of the Scientific Corps for the joint demarcation of the boundary between the United States and Mexico, under the Treaty of Guadalupe Hidalgo. He was then general supervisor of the harbor improvements on Lake Michigan, from April 20, 1854, to December 11, 1856, and of the channel improvement on the St. Clair Flats, from April 25, 1854, to September 1856. Graham was next superintending engineer of the harbor improvements on the North and Northwestern Lakes, December 11, 1856, to April 20, 1864, in which he documented the existence of a lunar tide in around 1859. Graham served during the American Civil War as superintendent of the United States Lake Survey, from August 30, 1861, to April 20, 1864; then as lighthouse engineer of the 10th and 11th Districts (comprising the Northern Lakes, except Champlain), the 10th District from August 30, 1861, to April 20, 1864, and the 11th District from August 30, 1861, to March 1863. His loyalty to the Union was questioned in 1864, and Graham was briefly under investigation and removed from his post. Graham served as superintending engineer of sea-walls in Boston harbor, and in charge of preservation and repairs of harbor works on the Atlantic Coast from Maine to the Chesapeake from August 1, 1864, to December 28, 1865. He died in Boston on December 28, 1865, and is buried in Congressional Cemetery in Washington, D.C.

Legacy James Duncan Graham is commemorated in the scientific names of three species of reptiles: Anolis grahami, Regina grahamii, and Salvadora grahamiae. Anolis grahami is a lizard species native to the territory of Bermuda that is named after him, and the it is notable in its vocalization and ability to change color. He is the namesake of Mount Graham, and Graham County, Arizona, is named after the mountain.

Dates of rank

References

Sources

This article incorporates text by unknown available under the CC BY-SA 3.0 license.

Illustrations

James Duncan Graham illustration

Worked examples

Example 1 — a first encounter with James Duncan Graham

Start with the simplest possible case. Write down what James Duncan Graham claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to James Duncan Graham before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about James Duncan Graham ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of James Duncan Graham

In research
James Duncan Graham appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses James Duncan Graham in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
James Duncan Graham is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1799 births, 1865 deaths, American topographers, so understanding it makes those chapters shorter.
In everyday life
Look for James Duncan Graham outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study James Duncan Graham in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what James Duncan Graham means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain James Duncan Graham out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is James Duncan Graham in simple terms?

James Duncan Graham (April 1, 1799 – December 28, 1865) was an early member and founder of the Corps of Topographical Engineers who engaged in many topographical exercises. A topographical engineer, he directed the re-survey of the Mason–Dixon line, and served on the boundary commissions between th…

Why does James Duncan Graham matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study James Duncan Graham?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on James Duncan Graham.

Tags

  • 1799 births
  • 1865 deaths
  • American topographers
  • Engineers from Virginia
  • Union army colonels
  • United States Army Corps of Topographical Engineers
  • United States Army officers
  • United States Military Academy alumni

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