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Helmet Lens
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Binoculars are two telescopes that are held together side by side. The images from the two prismatic telescopes are aligned to create binocular vision. In 1608, Hans Lippershey developed the telescope. When he tried to patent his instrument, it was not approved because other telescopes were previously known. The people that were in charge had never seen a telescope before, asked if he could make a binocular version of it, with quartz optics. He completed this in December of 1608. It was probably about three or four power and about an inch in aperture. He made two more within a few months. The original price was about 1000 florins, which he later lowered to 900 florins, which might be about 1000 dollars today. In his 18th century collection of Galileo letters, Giovanbattista De Nelli wrote that in 1618 Galileo constructed a helmet with a frame containing two small telescopes that were to be used on a ship. He called it celatone. Other writers described how a celatone in 1616 or 1617 and tested it on ships throughout 1617. In 1636, Galileo described how longitude could be ascertained by observing the positions of Jupiter's moons. He described this by using the celatone. Daniele Chorez made optical instruments in Paris. He was thought to have made a telescope by 1625.
In about 1660, a Frenchman Francois Lassere, the Capuchin Pere Cherubin d'Orleans, developed the binocular telescope, separating the tubes with a metal frame and placing this in cardboard boxes that extended by sliding the smaller box from within the larger. He made about 30 of these in the 1660,s and 1670,s. In 1714, Peitro Patroni made a binocular telescope with silver ocular covers that swing open to reduce glare. The objectives have about 12mm of clear aperture with about 10 times magnification, and the three lens erecting system has no aperture stop. Since most of these binoculars were sold to noblemen for collectors items or conversation pieces, they were decorated with elaborated gilt tooled leather. In about 1750, Francois Baillou made binoculars with deep green lenses for solar observation. In 1790, Peter Dollond improved the binoculars by using a tube to move the objective and oculars lenses with a rack and pinion track. All of these early twin telescopes were refractors. In 1864 during the civil war, the U.S. Naval Observatory asked Alvin Clark to make binoculars that combined wide field with high magnification. This was completed in February of 1865. There have been many improvements since then. In later year's reflector binoculars, digital, night vision is just some of the changes that have come about. Binoculars have many uses including astronomy, hunting, getting a close up view of the ball game and of course military.
Our web store TelescopesBinocularsinc.com is devoted to quality products. We have many brand names of telescopes and binoculars Bushnell, Leupold, Meade, Magnacraft, Olympus, Konus and others. Come visit our store at http://telescopesbinocularsinc.com
Motorcycle Riding Gear Your First Line of Defense
Motorcycle riding gear also known as protective gear should be worn by all bike riders. Protective riding gear serves many purposes . Protective riding gear protects riders from injuries from motorcycle accidents.
For best protection riders should wear full face motorcycle helmets to protect the head and face from impact and abrasions. All riders should wear a heavy weight leather motorcycle jacket and heavy weight leather chaps.
Both are designed to protect a rider from injuries. Other pieces you should wear are leather boots that cover the ankle area and also leather gloves. When a rider falls the first thing that hits the ground is your hands this should be remembered when purchasing gloves. Another purpose this gear serves is to keep you warm when riding in cold weather.
I have found you can ride in comfort down to 25 degrees when wearing layered clothing with a pair of chaps and insulated gloves. You should wear a helmet that has a shield to keep the cold wind from your face. Also remember to stay alert in cold weather due to slower reaction times and remember when its below freezing you make ride over some ice on road which could make for a bad day.
Wear the proper gear and you are ready for most anything that the weather can throw at you. Remember to ride safe till then hope to see you out on the open road.
<a href=" motorcycle-safety-first.com -Find information on bike safety, protective gear, motorcycle maintenance and product reviews.
About the Author
Len Henderson is a freelance writer on motorcycle safety and safety products. Len has been riding motorcycles for over 30 years and has had advanced motor officer training. He has reviewed many products related to biker safety. He shares his knowledge in articles and his website.
Optics-what type of lens set up do I need to view an object which is close up, whilst my eyes are at infinity?
The application is an in-helmet screen for displaying information to a motorcylcist. I want my eyes focussed at infinity since this would prove much safer than having to adjust my gaze every few seconds. A HUD is too complicated and expensive - a suitable lens to view a hacked mobile phone screen (say) would work really well. Any ideas?
A lens with a positive diopter, i.e. a convex lens. It sounds like you are sort of reinventing the bifocal with a different position for the reading lens.
Ian McEwan, Teasing Farce From Flawed Humanity
The main character of Ian McEwan's Solar is a Nobel Prize-winning climate change scientist who takes a trip to the Arctic. McEwan says he was inspired by humanity's ability to corrode good intentions with acts of pettiness.
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