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Between the law’s passage and its enactment, Dr. Samuel Wesley Stratton, the author of the letter that persuaded congress, was named Director of the agency and set to work locating premises for the offices, commissioning the buildings that would house the Bureau, seeking out qualified personnel, ordering the equipment that would be needed to perform the tasks necessary of the Bureau, and visiting laboratories abroad upon which the Bureau would be modeled. He had majored in mechanical engineering at the University of Illinois and later became an instructor and professor in the fields of math, physics and electrical engineering. He was also awarded six honorary doctorates from various institutions including Cambridge and Yale. Dr. Stratton would head the Bureau for 21 years and personally oversee its development into one of the best agencies of its kind in the world.

 

For much of its early years, the Bureau's energies were almost wholly engaged in developing its staff and organization and establishing new and much needed standards for science and industry. The equipment necessary for testing was ordered in Paris and Berlin and Stratton visited the International Bureau of Weights and Measures as well as the leading laboratories across Europe. Other members of the Bureau made similar visits during the early years.  Dr. Edward Rosa was hired from Wesleyan University to plan and direct the electrical research which had been so fundamental to the need for the Bureau. Stratton and Rosa believed it to be of the upmost importance and accordingly the Bureau provided Rosa with the best equipment available. Rosa published more than 75 papers during his time at the Bureau and demanded the same work ethic of his subordinates.

 

It was decided that the Bureau would be split into scientific and technical divisions. They also established a “Secretary’s Visiting Committee” on which served leaders in science and industry to annually report to the Bureau on matters of interest to its scope of influence. Invitations were sent to the chief electrical engineer at GE, the president of MIT and a professor of physics at Cornell, in addition to several others.

 

In 1903, the National Bureau of Standards was transferred from the Treasury Department to the Department of Commerce and rechristened the “Bureau of Standards”, dropping the “National” from its name. With this administrative change, the Bureau’s scope increased far beyond what it likely would have been in the Treasury to include active participation in the business sector.

 

After about 3 years, the Bureau had obtained sufficient instrumentation and staff to begin its real work. In the year prior to the establishment of the National Bureau of Standards, the Office of Standard Weights and Measures reported that it had compared 65 thermometers and 69 surveyors' tapes, had graduated and verified 772 sugar flasks, replied to 75 requests for information, and with routine weights, measures, and balance tests, had answered a total of 1,037 "calls" on it – all this while still having to send instruments abroad to Germany or England for verification of their accuracy. Within the first 3-4 years, In addition to all the work on standards, instrumentation, and planning of research in that period, the number of tests made for universities, industry, and Government agencies had increased eight times over that possible in the former Office and would more than double again within another year. One of the early projects of the engineering instruments section was to test gas meters, water meters, pressure gages and other instruments used by public utilities. This was one of the first large scale projects undertaken by the Bureau for the common good. Another early undertaking was testing on building materials.

Other early work of the Bureau included establishment of a standard of inductance, which impacted new developments in the communications industry.

 

In a little more than 3 years, Stratton had assembled the men and materials for an organization that, "judged by the magnitude and importance of the output of testing and investigation," said Rosa, "ranked second only to the great German Reichsanstalt among the government laboratories of the world doing this kind of work."

 

**The information presented here is drawn from “Measures For Progress: A History of The National Bureau of Standards” (Rexmond C. Cochrane)
  

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The need to regulate standards of measurement in the United States arose in the late 19th century amid the phenomenal growth of industry and the pace of invention the country was experiencing. The engineers and scientists behind the production and dissemination of such inventions as the automobile and electricity needed to test their inventions. In order to do this, they needed standards of measurement. Consumers also cried out for regulation and standardization of commodities produced by different manufacturers. The lack of uniform standards was also a problem in government. For example, when imposing import taxes, the same quantity of goods might be found to weigh more at one port of entry than another, as evidenced in an 1832 investigation which found that “no two customhouses in the country” had the same weights.

 

The founding fathers’ aversion to centralized power and control prevented earlier establishment of government standards, despite the fact that governments in Europe had long supported such measures. The federal government did not support any scientific measurement until the establishment of the Coast and Geodetic Survey was founded in 1807. In 1836, the Office of Weights and Measures was born within the Survey. Gradually, different government agencies developed their own research departments for things like medical research (Army), meteorology (Navy), telegraph facilities (Army), etc. In the world of academia, research was also taking place. At times, researchers within these contexts set up their own means of taking measurements, with the result that differing standards arose for the “same” measurement. William Mason of the Rensselaer Polytechnic Institute found eight different ‘authoritative’ values for the gallon, so to avoid confusion, he made up his own value for the gallon. Similarly, city surveyors in Brooklyn in 1902 recognized four different ‘feet’ as legal.

 

Eventually, a Congressional commission was established to evaluate the method by which research was conducted within government agencies. It found that work was being overlapped and duplicated by various agencies. As a result, the National Academy of Sciences was recommended to centralize research for government purposes, but fears of government encroachment on the free market ultimately killed the proposal.

 

The first real attempt by the government to standardize weights and measures came in 1836 when Ferdinand Hassler, superintendent of the Coast Survey in the Treasury Department, was directed by the Secretary of the Treasury to produce copies of various standards. Congress was still reluctant to enact a law making use of the measures obligatory, but they did approve the standards and instruct that copies be delivered to the governors in every state. Enforcement of their use, however, was not obligatory and laws continued to be passed at the state and federal levels defining new standards.

 

The new electrical industry was particularly affected by the lack of good standards. Laboratory testing was performed by trial and error, costing the industry dearly in time and resources, because accurate instruments did not exist for performing such experiments. At the turn of the century, electricity was a $200 million enterprise but its growth was slowed by the fact that it was frequently engaged in lawsuits for want of industry standards. As the United States was the world leader in electrical invention, instruments were created in this country for electrical testing, but users in Europe would calibrate the instruments themselves, because the US manufacturers’ standards were unknown. Measuring apparatus for all kinds of applications were regularly sent from the US abroad to be calibrated and verified in international laboratories, whose standards could be trusted, as opposed to having these services performed domestically. This eventually became viewed as a disgrace to the nation, to say nothing of the time wasted and money paid abroad for these services which should be performed within the US itself.

 

In 1899, work began to draft a bill for presentation to Congress proposing legalization of better standards and enforcement of their use. It was supported by numerous associations and institutes concerned with scientific pursuits. Representatives from manufacturing, government, and educational institutions spoke out via testimony and written endorsement for the need to enact such a bill. The proposal advocated reorganization of the Office of Standard Weights and Measures into the National Standardizing Bureau to be under the Secretary of the Treasury and that the new agency would have 6 primary functions:

  1. custody of the standards
  2. the comparison of the standards used in scientific investigations, engineering, manufacturing, commerce, and educational institutions with the standards adopted or recognized by the Government
  3. the construction when necessary of standards, their multiples and subdivisions
  4. the testing and calibration of standard-measuring apparatus
  5. the solution of problems which arise in connection with standards
  6. the determining of physical constants, and the properties of materials when such data are of great importance to scientific or manufacturing interests and are not to be obtained of sufficient accuracy elsewhere.

 

**The information presented here is drawn from “Measures For Progress: A History of The National Bureau of Standards” (Rexmond C. Cochrane)
  

As always, if you have any questions related to this material, our support staff at Cooper Instruments is available to help. Contact them by calling (800) 344-3921 or emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

 

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It is important to remember when measuring pressure within a liquid that the pressure is related not to the volume of the liquid, but to the height of the fluid column above the test point. This can be referred to as ‘hydrostatic pressure’ (for more on this term and related mathematical formulas, click here to visit Wikipedia). In other words, the pressure measured at 1 foot below the surface of an Olympic swimming pool should be the same as the pressure measured at 1 foot below the surface of a bath tub or 1 foot below the surface of a bucket. The units of measure typically used for hydrostatic pressure are inches of water column (WC) or feet of WC (also fluid column).

 

In the case of water, we can consider the following:

27.679 inches of WC is the approximate equivalent of 1 PSI at 40°C.
Water density at 60°F (15.6°C) = 62.37 pounds per cubic foot.
The pressure exerted by a column of water one foot in height is:
pounds x square foot = .4331 pounds

 

Click here to view Cooper Instruments’ most popular pressure transducers.

 

As always, if you have any questions related to this material, our support staff at Cooper Instruments is available to help. Contact them by calling (800) 344-3921 or emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

 

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We're excited to announce that we've put up some product demonstration videos that we hope our customers will benefit from. These videos can be accessed by the product page under "Best Sellers" or by accessing the links below. We hope to be posting more videos in the future, so watch our Facebook page for announcements! We'd also love it if you'd like to share your own video demonstrations of how Cooper products are used in your applications.

 

WTM 502 video

Series 5 video

ESM301 product overview

ESM301 syringe test

ESM301 peel test

 

As always, if you have any questions related to this material, our support staff at Cooper Instruments is available to help. Contact them by calling (800) 344-3921 or emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

 

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I found this article about verifying the accuracy of a measurement system on Quality Magazine's website and thought it could apply to virtually anyone who purchases our test measurement equipment. Some of the main ideas of the article include:

 

  • Defining "expanded gage R&R study"
  • Explaining difference between a standard gage R&R study and an expanded gage R&R study
  • Giving examples of situations in which an expanded gage R&R study is appropriate

 

Click here to view the article.

 

As always, if you have any questions related to this material, our support staff at Cooper Instruments is available to help. Contact them by calling (800) 344-3921 or emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

 

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We have announced new products that have been added to our catalog. The LXT 980 and LXT 981 torque sensors will bring additional options to our torque sensor offerings, while the Series 2 digital force gauge is an economical solution for tension and compression force testing.
 
LXT 980/981
The LXT 980/981 torque sensors can be used for measuring torque forces from 0 to 2000NM bi-directionally. The two models, the LXT 980 and LXT 981 differ in their stated accuracy (0.2% of full scale for the 980 vs. 0.1% for the 981) and their linearity specifications (<±0.2%ME for the 980 and <±0.1%ME for the 981). In other respects, the technical specifications for the two models are similar. Both operate on the non-contact principle, meaning that the sensor is maintenance-free and operational over a wide temperature range, from -30°C to +85°C. These torque sensors are highly tolerant of dynamic loads and offer integrated signal conditioning, among other features.
 
Series 2
The Series 2 Economical Digital Force Gauge is a new offering from Mark-10, for whom Cooper Instruments has been an authorized distributor for many years. This gauge is designed for use in tension and compression force testing applications up to 100 lbs. With a large, back-lit graphic display the gauge shows peak tension and compression values captured using the 500 Hz sampling rate. Users can select from three units of measurement (lb, kg, N) and can choose to power the unit with an AC adapter (optional) or 9V battery. This unit is designed with an ergonomic, reversible aluminum housing that allows for hand-held use or fixture mounting and is rugged enough to withstand use in production environments as well as laboratories.
 
Please contact one of our knowledgeable sales staff if you’d like to know more about these new instruments. You can reach them by calling (800) 344-3921 or emailing This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
We’d love to hear your feedback regarding this or any other article we’ve posted. To leave feedback, ‘Like’ us on Facebook and then post your feedback on our wall.
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