Today we have been presented a series of lectures on the many activities and manufacturing aspects of the ARISTO firm in the last decades of its active existence. All presentations had as subject a specific own theme related to the history of manufacture of slide rules. But, what is not expressed sufficiently is the history of the person who shaped this firm and who had to care for all activities and decisions to attain the wanted and obtained results: I will try to sketch a portrait of him in my lecture and tell about aspects which are probably unknown or perhaps unexpected among us as collectors. Consequently manufacture came to an end. The father of Mr. Georg Dennert, born in , was in spite of his high age very active in the firm until , to help and assist his son Mr. Hans Dennert to run the firm. Altogether it could not anticipate the decline of sales after One can understand that this was a very big disappointment for both of them, having been such a flourishing firm during so many years.
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Box Minneapolis, MN Official Website Customers can shop, check order details and contact a customer care representative from the official Target website at http: The customer service information is listed on the Contact Us page. That information includes specialty departments, financial services and more. You can also choose to visit other sites to contact Target customer service like Facebook or Twitter.
Course Rules. Attendance: This is a field-based upper level course. As such attendance and participation are required. e.g. stratigraphy, radiometric dating, and paleo magnetism. (Philostratus, Imagines), review of a web site, slide quiz, final essay, regular attendance, .
Electronics This slide rule has no maker’s name. It has a patent number in the well, DR Patent Ron Manley, on his website presents an identical slide rule along with a convincing argument that this rule is an early Nestler. Another identical rule can, however be seen on the International Slide Rule Museum website originating from A.
I received this rule from Australia reputedly from the estate of Professor Allan G. Bromley known for his research concerning Babbage’s Calculating Engines. I can’t prove that this link is real. The slide rule came in a box marked J.
Nestler Slide Rules The latest member of my little slide rule family, Nestler was another major German slide rule manufacturer. They had many similar offerings to Faber Castell, and their early celluloid-wood rules are actually quite difficult to tell apart. Like Faber and Aristo, they eventually switched to mainly all-plastic models, and produced some very high quality rules. Is it my imagination, or did those Germans really love to make slide rules?
Traditions of Eastern thought conceptualised life in a holistic sense, emphasising the processes of maintaining health and conquering sickness as manifestations of an essentially spiritual principle that was of overriding importance in the conduct of living.
Dating slide rules by the chemical data they provide. Yet I could not resist the temptation to buy a Nestler Chemiker 33 slide rule. This slide rule contains scales with molecular masses to assist chemists in synthesis and analysis. Slide rules with the same function were already made in the nineteenth century. I tried using those masses to date the slide rule. Atomic masses The determination of atomic masses is not an easy task.
One of the reasons being that chemists need a mass that is averaged over all the isotopes of an element, weighted by their natural abundance. In the late nineteenth century the resultings discussions led to the formation of national commissions for the establishment of atomic masses. A convenient list of atomic masses as published over the years by the International Commission can be found on the web. If, nevertheless, we assume that Nestler always adapted the table, and perhaps the scales as well, to the new values of the International Commission, we can use the table to date Nestler Chemiker slide rules.
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In most cases dating of a particular slide rule requires consideration of several parameters. Model numbers , serial numbers , catalog descriptions , cursor types , patent dates , variants , and specials are used in combination with each other to fully identify a given rule. The following is a discussion on the subject.
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One of the Aristo’s high-end duplex rules, this early model demonstrates Aristo’s considerable engineering and design prowess. Although made entirely of plastic including the end braces , this German rule has an incredible feel and look that just puts all those cheap plastic American rules to shame. The plastic is very unusual but appealing, and has a slight rubber feel to it. Like Faber Castell and Nestler , Aristo also features self documenting scales on the right-hand side of the rule, extended primary scales, and a multi-hairline cursor.
Also like the high-end Faber and Nestler rules, this rule features extra little rubber “feet” on the end braces so that you can lie the rule down flat on either side and freely move the cursor assembly without scratching anything. A pity my scanner doesn’t allow me to show you more of the rule. The case is a variation on the common two-tone plastic idea, although the dark gray base embossed “Aristo – Studio” also features an additional portion that lets you slide the included conversion chart up and down for quick calculations.
This also provides the additional safeguard of preventing the rule from flying out of the case, as it slightly catches the protruding rubber feet. I’ve rarely seen such care and thought go into the design and production of a rule. Ecobra System Rietz A nice little slide rule from an obscure German manufacturer. This one is complete with the unused leather slip case, manual, box, and original plastic wrap.
One more step
Smith worked on the British Museum brain catalogue before being appointed to Cairo. The anatomical study of human brains: Brains were amassed to make correlations with race, sex and intelligence, or to find neurological abnormalities in notable individuals e.
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Click on the logo above to see the details, and order your copy. Richly illustrated with 97 color photographs, it is suitable for everyone from new beginners to long time collectors. There are only 1, copies in the press run, so don’t miss out on a chance to get this incredible illustrated reference. Need a good manual and introduction to slide rule operation for that new user? Loaded with great information and color photographs, an ideal way to interest that new student.
Loosely speaking, there are three mechanical types of flat slide rules: Mannheim or Simplex Slide Rules, which have a single-sided cursor and one main operating surface, with sliding and stationary scales. This type of rule is held together by the continuous back surface, which joins the two stationary scale bodies. Unfortunately, the cursor can usually be slid right off this type of rule, making it very easy to loose, especially when slid into its case.
Some later rules incorporated edge ‘keepers’ to prevent the cursor from accidentally disappearing.
Political Economics Politics and Economics: How are the two fields related? Politics is public administration and policy-making. The fields are related like everything is related to some degree, but a person is not likely to be both a competent economist and a competent politician. I look at both economics and politics as social sciences. The concept that unites the two fields is the idea of rational choice.
“Rules of Engagement.” But he is probably best known for Jennifer Nestler, an environmental science junior, said the organization should focus on getting students to care its and tat- dating while on the-road, inspira-ons for the tional people in his life and scary mo-.
What is the situation during brain maturation? Do interneurons and pyramidal neurons become functional at the same developmental stage or are they sequentially functional? This was investigated using the bromodeoxyuridine BrdU technique. When BrdU is injected systemically, it is incorporated in the DNA of cells in the process of division. It is therefore possible to label neuronal ensembles according to their postmitotic age and determine their migration speed.
More recent techniques relying on genetic birth dating of neurons suggest even earlier development of GABAergic interneurons, further reinforcing their interventions early in hippocampal activities. Interneurons are mature at an earlier stage than the bulk of principal cells. Histogram showing the proliferation rate of pyramidal cells green and interneurons gray according to the embryonic age of the rat.
Faber Castell Slide Rules Faber Castell rules were manufactured predominantly in Germany, and they were clearly the dominant European slide rule maker. Faber rules are considered by many slide rule enthusiasts as among the best ever made. They sold a wide range of models, with many of their early offerings made of Swiss pearwood or boxwood with celluloid facings.
Later rules were made out of Geroplast their name for plastic and featured some of the most useful and advanced features ever seen on slide rules.
Ron Manley, on his website presents an identical slide rule along with a convincing argument that this rule is an early Nestler. Another identical rule can, however be seen on the International Slide Rule Museum website originating from on.
Americans like watching porn — and lots of it. According to the website Paint Bottle, 30 percent of all data transferred online is porn. In a infographic, the porn site detailed that 70 percent of men consume the content compared to 30 percent of women. And the number of people consuming porn is rapidly increasing every week, according to the site. How does porn affect the brain? Studying porn and determining its health effects are tricky, experts say.
Wright, an associate psychology, socialization and media use professor at Indiana University Bloomington, told Fox News in an email. In short, this would be a monumental effort, and likely would still lead to some disagreement among scientists, because although the promise of science is consensus, scientists rarely percent agree on anything.
Sun Hemmi Slide Rules Hemmi was the largest manufacturer of slide rules, and is estimated to have sold some 15 million rules over its lifetime. These were sold under their own name Sun as well as redistributed for a large number of other companies, most notably the Frederick Post Co. Reflecting their Japanese origin, these rules were often made of bamboo with celluloid facings, which worked out very well since bamboo is naturally self-lubricating and withstands changes in temperature and humidity better than other types of wood.
Nestler AG (Germany) pocket slide rule in good condition, in its original case which shows reasonable sign of wear. £ Fowlers Jubilee Magnum Long Scale Calculator & Pouch in very good condition. possibly dating from the ‘s, this Magnum Calculator is in very good condition. Slide Rules. Period. see all. to to.
The second method uses a sliding linear L scale available on some models. Addition and subtraction are performed by sliding the cursor left for subtraction or right for addition then returning the slide to 0 to read the result. Standard linear rules[ change change source ] The length of the slide rule is quoted in terms of the nominal length of the scales.
Models a couple of meters long were sold to be hung in classrooms for teaching purposes. Some high-end slide rules have magnifying cursors that make the markings easier to see. Such cursors can effectively double the accuracy of readings, permitting a inch slide rule to serve as well as a inch. Various other conveniences have been developed. Trigonometric scales are sometimes dual-labeled, in black and red, with complementary angles, the so-called “Darmstadt” style.
Duplex slide rules often duplicate some of the scales on the back.
Albert Nestler Timeline
Unique Slide Rule Company Dating a slide rule becomes difficult if a manufacturer did not imprinting a date code or serial number on the stock. Even then, some manufacturers recycled their serial numbers over time, and the stock could have been left on a shelf for a period of time before the slide rule was assembled and shipped.
Catalogs are an excellent indication of when a model was produced or discontinued. Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades. Dates that a design was registered or patented only suggests an approximate year a model may have been first produced, as the model may have been distributed a year or more before issuance patent pending.
Jun 10, · Blotter acid. Save. Lysergic acid diethylamide an amendment of the Criminal Code, which was necessitated in order to align the Czech drug rules with the Single Convention on Narcotic Drugs, became pre-dating daguerreotypes and the later wet collodion photographic process. Talbot, inventor of the calotype paper negative process, wanted.
It was published for 35 years from to Geffen as the publisher, the first issue of Medical World News hit the newsstand on April 22, It began as a biweekly publication, but quickly increased its frequency to every week. From the beginning Medical World News aspired to be more than just another medical journal. He shaped the tone and concepts of the publication, emphasizing photography to differentiate Medical World News from other medical journals.
He had a photo staff of six people, including Rick Giacalone as art director and Don Monaco and Martha Roberts as photo editors. The work of the staff and amount of images created, reviewed, and used for each story was a massive undertaking. For a single story, they may scrutinize as many as color slides or a dozen rolls of frame black-and-white film–from which they will choose only four or five of the best for publication.
Many were members of the American Society of Magazine Photographers. Some photographers were associated with photo agencies, like Black Star and Magnum Photos. Ownership of the Medical World News changed throughout its year history. The following is a list of publishing companies, their locations, and years of ownership: With its comprehensive coverage of these and other critical issues MWN has fought tirelessly for and on behalf of the primary-care physician.