Circular Slide Rule Watch Tutorial. First, Determine Your Type of Circular Slide Rule. If both the outside and inside circular rules have identical scales with a full range from 1. C and D log scales. These are useful for multiplication and division as well as ratios and percentages which are really just multiplication. Great, this is the type of slide rule discussed in this tutorial If the outside rule is the reverse of the inside rule, then you have the C and CI or inverse scales. Sadly, this page will not be helpful to you. But a quick Google search for slide rule CI scale should get you going. Understand Slide Rule Basics. The most important thing to remember when using the circular slide rule is to ignore decimal place when entering values. Always select the two digit number closest to the two most significant digits in your value. Lets take a look at some examples to make this clear Number to input. Select on the slide rule. Of course, youll have to remember to shift the answer by an appropriate power of ten when you get it back. Heres an example 5,0. You have to figure out the appropriate amount of zeroes to get the correct answer of 3. Using the slide rule for a while improves your ability to estimate correct answers Perform Multiplication. Multiplying numbers on the slide rule is easy. Basically, you set a multiplier on one scale that creates a lookup table on the other scale. Heres how to do it. The largest independent, noncommercial, consumeroriented resource on the Internet for owners, collectors and enthusiasts of fine wristwatches. Breitling Chronomat 44 IB0110 B01 inhouse movement 8080. CAD. e10669. Even though Breitling have been around since 1884 and are one of the most popular brands. Would you like to know how a mechanical watch is made what Ebauche, Cyclops or Mainspring means Then you must read our Watch Parts Glossary. Breitling Navitimer GMT Chronograph Automatic Watch AB044121G783 Huge Selection 100 New Authentic. Feast your eyes on the 2015 Breitling B55 Connected watch that connects via Bluetooth to your smartphone. Sporty Chronograph homages 150300. Affordable automatic chronographs are difficult to find. Navitimers have the sliderule bezel, which allows for metric to. My instructions will refer to the inner and outer rules. Since the C and D scales are identical, you can actually swap them and itll still workLets do 5 6 Align 1. This sets the multiplier to 5. Now look at 6. 0 on the inner rule. It should line up with 3. Now we double check the decimal place of our answer. Breitling Slide Rule Manual' title='Breitling Slide Rule Manual' />As it happens, 5 6 does equal 3. Whats handy is that we have now set up the slide rule to multiply any number by 5 without making any more adjustments. We just need to look at a number on the inner rule and see the answer in the outer rule for example, 2. As you have probably figured out already, you have also set the rule to multiply by 5. Remember, its up to you to keep track of the decimal place. Lets try another one. Align 1. 0 on the inner rule with 3. Now look at 4. 0 on the inner rule. It should line up with 1. Knowing that our answer should be in the thousands, lets adjust 1. Now its correct Try a few others and check your answers with a calculator. Youll quickly get a hang of it. Perform Division. Dividing is just the reverse of multiplication. Jalopnik has been told that some area dealers dont favor this idea because they feel as if workers can become vested employees and use the pay minimums set by the. Griffin Powermate 2.0. This time we align the two numbers of our problem, and the answer will appear next to the 1. Well start with 6. Align 6. 0 on the outer rule with 3. Breitling Swiss The Navitimer was created in 1952 and to the best of my knowledge, it is the origin of all circular slide rule flight computer watches. I like doing it this way because it lets me visualize 6. Now look at 1. 0 on the inner rule. It aligns with 2. Now lets try something without a nice, clean integer answer 57 Align 5. Now look at 1. 0 on the inner rule. A2432212-C651-761P-A20D1.jpg' alt='Breitling Slide Rule Manual' title='Breitling Slide Rule Manual' />It aligns just a little past 7. Adjusting the decimal point correctly gives us roughly 0. The correct answer is actually 0. Obviously, the slide rules on watches are so small that it is hard to get more than two digits of accuracy. Still, its a wonderful estimation tool. Distance and Volume Conversions. If your watch has them, you can use the unit conversion marks to convert amounts of one unit to another. All of the conversions work the same way and theyre very simple. Note my instructions assume that the unit indicators are on the outer rule. If they are on the inner rule, simply reverse my instructions. Lets convert nautical miles to kilometers. Well start with 2. Breitling Slide Rule Manual' title='Breitling Slide Rule Manual' />Align 2. Naut indicator on the outer rule. Now look at the kilometer Km indicator of the outer rule. It aligns just slightly past 4. There is no need to adjust the decimal. The precise answer is 4. Use this same method to convert any of the following if indicated on your watch Nautical miles, statutory miles, kilometers, and 1. Pounds of fuel, pounds of oil, imperial gallons, U. S. gallons, and liters. Kilograms and pounds. Time calculations. Any slide rule watch will allow you to do these calculations. Some make it simpler by including a time scale on one of the rules which translates from minutes to the familiar HH MM format. One of the many original uses of flight computers was to estimate time of arrival. Heres how you might calculate ETA. Note my instructions assume a time scale if any is on the inner rule. Lets say you have a ground speed of 4. Whats your ETA Align 6. Now look at your distance, 5. It aligns roughly with 7. The answer is that youll arrive in about 7. Of course, the HH MM time scale only works if the number of minutes is in range. If we had 5. 00 miles to go instead of 5. NOT 1 1. 0 Conversely, You can figure out how far youll go in a given amount of time at a given speed. Say were going 7. Align 6. 0 on the inner rule with 7. Now look at the time of 1 3. It aligns roughly with 1. The answer is that youll travel about 1. Lastly, if you know how far you went and how long it took, you can figure out how fast you were going. Say we went 2. 50 kilometers and it took two hours Align 2 0. Now look at 6. 0 on the inner rule to solve for minutes. It aligns with about 1. Thats the answer. You would have gone 1. Percentages. Like the unit conversions, calculating percentages is simple to do and comes in handy in stores and restaurants. Say you see a 7. You can find out what it would cost by aligning 1. Now you can see the 7. If everything is 2. A 1. 7 tip in a restaurant is easily calculated by aligning 1. A 2. 5 meal shows 4. The tip would be 4. The trick is to always apply the common sense shift of the decimal point as needed. Once you get proficient, its fast and easy. A Little Bit About These Watches. Id always been fascinated with the apparently complexity of pilot style watches, but it wasnt until fairly recently that I finally got the urge to learn more about them. I actually had no idea that these watches contained slide rules The geek factor of having a slide rule on your wrist as well as the aviation and space race connections sold me on the concept. I purchased a Seiko SNAB6. Flight Master chronograph in 2. It has a slide rule bezel styled after the famous Breitling Navitimer which in turn borrowed features from the E 6. B manual flight computer carried by pilots. The standard features are C and D or fundamental scale log rules. A time scale matching hours to minutes. Markers for converting from nautical to statutory miles and to kilometers and thousands of feet. Conversions for U. S. gallons to Imperial gallons or liters or pounds of fuel or oil. Conversions from pounds to kilograms. Breitling still makes the Navitimer, but many manufacturers made or currently make watches with slide rule bezels such as in no particular order Breitling. Swiss The Navitimer was created in 1. Breitling still makes an array of excellent flight watches. A. I. Wajs. Swiss They make some extremely attractive O W aviation watches. Hacher. Swiss The Aviateur series of flight computer watches feature slide rules. TAG Heuer. Swiss They make several excellent slide rule watches. Interestingly, a Heuer stop watch became the first Swiss watch to make it into space via John Glenn. Tissot. Swiss They have made some slide rule watches, but I dont believe they currently offer any. Ikepod. Swiss Designed by Marc Newson as are all Ikepod watches, the Megapode is a beautiful watch with a slide rule. Breitling Watches. Once a manufacturer of aircraft cockpit instruments, Breitling has always had an affinity with the aviation industry and has moved with time and technology to provide pilots with useful equipment ever since. From the slide rule calculator bezel to the emergency distress signal transmitter, Breitling is a true pioneer of aviation.