— Early, ca 1820, James Watt Model Steam Engine.

Possibly the finest model of an original period Model from ca 1820, featuring a four column rotative James Watt vertical steam engine of the reciprocating beam type with double-action low-pressure single-cylinder, Watt's “parallel motion” linkage, and Watt's centrifugal speed governor. James_Watt_ca_1820_steam-engine_featuring_four_columns_rotative_vertical_beam_design_centrifugal_governor_low_pressure_single_double_acting_cylinder_Watt's_Parallel_Motion
If the reader knows of the wereabouts of a finer model anywhere in the world, I would love to hear about it; please leave a comment with the pertinent info for everybody else to see. Please correct me and leave a comment, thanks!
James Watt is considered the father of the industrial revolution and was one of the most important engineers and scientists in history. Some scientists argue that the design of the parallel motion (or double-acting engine) patented by Watt in 1784, should serve as the starting point of the “Anthropocene Epoch” - the unofficial interval of geologic time in which human activity began to substantially alter Earth's surface, atmosphere, and oceans. read more>>


Posted on 08 Jun 2020, 17:12 - Category: Scientific Instruments
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— Charles Lane Poor Line of Position Computer

This exceedingly rare navigation instrument is called “Line of Position Computer,” and is essentially a mechanical navigator or circular slide rule for determining one's location, either from morning or afternoon sightings for longitude or from the St. Hilaire method of finding the line of position. Charles_Lane_Poor_Line_of_Position_Computer Despite the extensive references in the literature, Poor´s Line of Position Computer was not a commercial success and only very few examples are known to exist, “[t]he scarcity of surviving examples suggests the government and general public had little interest in the instrument. Indeed, aviators preferred inspection tables over slide rules for navigation,” The National Museum of American History.
Charles Lane Poor (January 18, 1866 — September 27, 1951) was born in Hackensack, New Jersey, the son of Edward Erie Poor. He graduated from the City College of New York and received a Ph.D. in 1892 from Johns Hopkins University. Poor became an American astronomer and professor of celestial mechanics at Columbia University from 1903 to 1944, when he was named Professor Emeritus. He published several books on astronomy and a monograph disputing the evidence for Einstein´s theory of relativity in the pre-war years before the theory became firmly established. Poor published a series of papers that reflect his lack of understanding for the theory of relativity, read more>>


Posted on 21 May 2020, 17:11 - Category: Scientific Instruments
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— Charles Page Reciprocating Electro-Magnetic Engine of 1838. Sold!

At that time (1830's and 1840's) it was still open whether Electromagnetic motors should be rotating or reciprocating machines, i.e. simulate a plunger rod of a steam engine. Charles_Grafton_Page_Reciprocating_Electro-Magnetic_Engine While Davenport's motor was resembling a rotating design, Pages motor was based on the plunger type, resembling a steam egine by which Page replaced the piston generating the force transmitted to the flywheel by a beam with four electric magnets.
This working demonstration model was crafted by Daniel Davis Jr., sometime after July 1838 and was mentioned in Benjamin Silliman's American Journal of Science, vol. XXXV, 1838, page 264; the oldest Scientific Journal in the United States, founded in 1818.
It is estimated that less than five of these models have survived and are only to be found in museums or major private collections. read more>>


Posted on 28 Mar 2020, 00:00 - Category: Scientific Instruments
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