Articles About history
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The history of railroading is a saga of epic proportions: North meets South; Ocean meets Ocean. Track and trains and the locomotives that power them have long held Americans' fascination and fancy.
Defined in rudimentary terms, an electric motor is a device that uses electricity to create mechanical force. But in 1834, when our story takes place, most people would have trouble understanding the ramifications. That was the year that one of the earliest DC electric motors was invented—by a blacksmith.
The following is a very brief overview on the life, work and achievements of Al-Jazari - the most famous mechanical engineer of his time. Now well more than 1,000 years ago,
In 1941, the federal Aircraft Engine Research Laboratory set up shop in Cleveland, Ohio. This year, and several name changes later, what is now the NASA Glenn Research Center celebrates its 75th anniversary. As part of the year-long festivities, Glennâ™s adjunct Lewis Field main campus will be open to the public May 21 and 22, and Plum Brook Station in Sandusky, Ohio will hold its open house June 11 and 12.
She was born Phoebe Sarah Marks April 28, 1854 in Portsea, Portsmouth, Hampshire, UK â” the third child of a Polish-Jewish watchmaker named Levi Marks and Alice Theresa Moss, a seamstress. Her father died in 1861, leaving Sarahâ™s mother with seven children â” and another on the way â” and Sarah with shared responsibility for caring for the children.
This paper summarizes the chemical, metallurgical and physical aspects of bearing steels and their effect on rolling bearing life and reliability.
Even for a toddlin town famous for making âœno small plansâ â” such as, for example, reversing in 1900 the Chicago River to secure clean drinking water, or rebuilding itself seemingly overnight after the devastating âœGreat Chicago Fireâ (1871) â” to physically â” and successfully â” elevate itself as much as 14 feet above its original ground level defies not only description but credulity.
In 2017, there's more variety to be found under the hood of a car than ever. Electric, hybrid and internal combustion engines all sit next to a range of transmission types, creating an ever-increasingly complex evolutionary web of technology choices for what we put into our automobiles. But every evolutionary tree has a few dead end branches that ended up never going anywhere.
Bill Walton â“ a 7 foot tall anomaly from the annals of basketball history who wears tie-dye shirts, listens to the Grateful Dead and, according to his own outlandish proclamations, hasnâ™t taken an indoor shower in 35 years â“ is well-known for looking at average accomplishmentsand being overcome with extreme fits of emotion.
A brief history of automata, featuring Henri Maillardet's automaton at the Franklin Institute.
In the history of machine tools, spindles have been very good relative to other bearings and structures on the machine. So quality professionals have developed a cache of toolsâ”-ball bars, grid encoders displacement lasers, etc.â”-to help them characterize and understand the geometry of the structural loop. But as machine tools have improved in their capability and precision, and the demands of part-geometry and surface finish have become more critical, errors in spindles have become a larger percentage of the total error.
News Items About history
1 PTDA Releases Latest Sales History & Outlook Report (November 22, 2016)
The second quarter Sales History & Outlook Report (SHOR) released by the Power Transmission Distributors Association (PTDA) shows pow...