Category Science

               Until clocks small enough to be carried were invented, sundials were the only portable timepieces. Peter Henlein is today regarded as the inventor of the watch. At the beginning of the 16th century in Germany he made some of the earliest watches. One of the earliest references to what we would perhaps now call a wristwatch or at least an ‘arm watch’ was the New Year gift received by Queen Elizabeth I from Robert Dudley, the Earl of Leicester, in 1571. However, wrist watches only became popular when the German navy issued wristwatches to all its men in 1880.

               In 1926, the creation by the Rolex Company of the first waterproof and dustproof wristwatch marked a major step forward. Digital watches arrived in 1971. They were developed by the American engineers George Theiss and Willy Crabtree.

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            The Ancient Egyptians were the first to make sundials, in 2000 BC. They were inspired by the movements of shadows as the sun advanced across the sky. The earliest known of these clocks dates from the 14th century BC. The night time charts were based on water clocks. Water clocks were designed with sound-producing bells to indicate hours.

            Around 1090, the Chinese astronomer Su Sung devised the  first mechanized water clocks. Mechanical clocks that were not powered by water slowly started appearing in the 13th century, but they were heavy. In the 15th century, portable clocks and watches were introduced. It was Salomon Coster and Jan van Call who first produced a pendulum clock.

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           A sphygmomanometer is a device used to measure blood pressure. One of the most important men in the development of the sphygmomanometer was the Austrian physician Karl Samuel Ritter Von Basch. The first clinically applicable sphygmomanometer was invented by him in 1881. Von Basch introduced the aneroid manometer, which uses a round dial that provides a pressure reading.

               An improved version was introduced by Scipione Riva-Rocci in 1896. Later, in 1901, the neurosurgeon Dr. Harvey Cushing introduced Riva-Rocci’s device in the USA, modernized it and popularized it within the medical community. In 1905, Russian physician Nikolai Korotkov discovered ‘Korotkov Sounds’ and included diastolic blood pressure measurement.

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               A barometer is an instrument that measures atmospheric pressure.

               It was during the 17th century that a series of experiments conducted by Italian scientist Evangelista Torricelli resulted in the invention of a basic barometer.

               Torricelli was the first to notice that air pressure changes, related to weather changes, indeed caused the water level to rise and fall within a 35 foot tube experiment he set up within his home. He later used mercury in it.

               The barometer utilizes the principle that as atmospheric pressure pushes down on the surface of the mercury in the cistern, the mercury in turn, pushes up with an equal pressure in the glass tube.

               It wasn’t until about the year 1670 that barometers began to be used as a weather instrument in homes since 1670.

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            A stethoscope is a dependable clinical tool used for the physical assessment and monitoring of a patient. The stethoscope was invented in 1816 by a French scientist, Rene Laennec. He placed a rolled piece of paper between the patient’s chest and his ear; he found that this could amplify the sound of the beating heart. This was readily accepted, as it did not require physical contact.

            In 1851, Irish physician Arthur Leared invented a basic binaural stethoscope. In 1852, George Philip Cammann introduced the modern binaural stethoscope for commercial production. Rappaport and Sprague designed a new stethoscope in the 1940s, which became the standard by which other stethoscopes are measured.

            In the early 1960s, an improved model was developed by David Littmann. Later, in 1999, Richard Deslauriers patented the first external noise reducing stethoscope, named DRG Puretone.

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            A syringe is a medical device that is used to inject fluid into, or take fluid from, the body. The word ‘syringe’ is derived from the Greek word syrinx, meaning ‘tube’. Primitive syringes were used by Romans syringes were used by Romans during the 1st century AD. They are mentioned in a journal called De Medicina as being used to treat medical complications.

            In 1899, Letitia Mumford Geer of New York was granted a patent for a syringe design that permitted the user to operate it single-handedly.

            Later, in 1946, the Chance Brothers in England produced that first all glass syringes with an interchangeable barrel and plunger. Charles Rothauser invented the world’s first disposable plastic hypodermic syringe in the late 1940s. Then, in 1956, a New Zealander, Colin Murdoch was granted a patent for a disposable plastic syringe.

            Later, many forms of syringes were introduced, among which the hypodermic syringe with a needle fine enough to pierce the skin, by Charles Pravaz and Alexander Wood, was the most iconic one.