Each of these tiny lines represents a fraction of an inch. Now, notice the lines between each inch, with some longer and some shorter than others. Right away, you should be able to tell that this ruler uses inches, as it’s divided into 12 equally spaced areas (labeled 1-12), and we know there are 12 inches in a foot (ignore the cm below). If you’re American, inches are the measurement you probably know better than centimeters, which are sometimes included on your standard 12-inch, or 1-foot, ruler. A pencil case for school, college or university is not complete without a durable and reliable ruler. The most notable use of a ruler, however, is in office spaces and schools. The printing industry and other industries utilise different types of rulers as well. Different types of rulers can be used in different industries, for example, in tailoring, software, architecture, design and more. Uses of a RulerĪ ruler has had many uses throughout history but has always been a prominent tool in Geometry. Other forms of rulers include a desk ruler, a steel ruler, a carpenter's rule, a seamstress tape and even a tape measure. The first flexible ruler, however, was invented back in 1902 by Frank Hunt. The first folding ruler was created in 1851 by Anton Ullrich. For example, we have metal, wooden, rubber and folding rules to use. The wooden ruler dates back to the 16th Century however, we now have different forms of rulers. The metric system was then introduced into the UK at the start of 1965. The idea was first proposed in 1670 however, it was only standardised in the 1790s, by the French. In 1799, the metric system was introduced as the existing system was impractical for trade during the French Revolution. The metric system is the decimal measuring system based on the litre, metre and gram as units of capacity, length and weight/mass. The first ruler was actually a copper alloy rod however, there were rulers made of ivory in 1500 BC. The first ruler did not look like the ones we have in our stockroom. The first noted ruler in history, however, dates back to 2650 BC. In the past, humans have used body parts as ways to measure distances or objects, for example, a hand or foot. Some cool facts about rulers you probably didn't know ! The Invention of the First Ruler Due to the easy fold mechanism on the sides, the paper ruler can be used for measuring and drawing as well.
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884 012113.JustFreeTools provides you with an easy to use, free printable online ruler that will save you to ever look for a ruler again! For Letter as well as A4 sized paper, inches as well as centimeters. (2017) Nucleic acid amplification of HIV-1 integrase sequence subtypes CRF01_AE and B for development of HIV anti-integrase drug resistance genotyping assay.
GeneRuler DNA Ladder Mix to analyse samples after PCR reactionsĪdlar FR, Bela B. (2017) Methods for Genotyping-by-Sequencing. GeneRuler DNA Ladder Mix as a control to test SPRI beads performance (evaluation of size distribution of fragments) (2018) Five BoLA-DRB3 genotypes detected in Egyptian buffalo infected with Foot and Mouth disease virus serotype O. Othman OE, Khodary MG, El-Deeb AH, et al. GeneRuler 100 bp DNA Ladder to analyze RT-PCR reaction products (2018) Associations among two vitamin D receptor (VDR) gene polymorphisms (ApaI and TaqI) in acne vulgaris: A pilot susceptibility study. Swelam MM, El‐Barbary RAH, Saudi WM, et al.
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GeneRuler 100 bp Plus DNA Ladder to analyze polymerase reaction restriction fragment length polymorphisms (2015) Rapid detection of Mycoplasma synoviae by loop-mediated isothermal amplification. Kursa O, Woźniakowski G, Tomczyk G, et al.
GeneRuler 100 bp Plus DNA Ladder to analyze sample after PCR and LAMP reactions
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