Stadimeter

A stadimeter helps you see how far things are.

You look through it at a tall object. You must know how tall that object is. It measures the angle from top to bottom. This tells you the distance to the object.

A man named Bradley Fiske made it. He was in the Navy. Ships use it to stay at the right spot.

It is small enough to hold in your hand. It can even fit in a periscope. This tool is still used on ships today.

A stadimeter helps you find the distance to an object.

To use it, you must know the height of the object. You look through the tool at the object. It measures the angle from the top to the bottom. This angle tells you how far away the object is. This tool is a type of analog computer. An analog computer uses physical parts to solve math problems.

Bradley Allen Fiske made the first version. He was an officer in the US Navy. He tested it at sea in 1895. It helped ships stay at the right distance from each other. It was also good for navigation. A periscope can even hold a small stadimeter. In World War II, the Navy made the Mark 5 version. It used a pivot arm instead of a slow screw. This change made it much faster to use. This new version could measure many objects quickly. US Navy ships still use it today. They use it when they should not use radar.

A stadimeter is a special tool for finding distance.

It helps people guess how far away an object is. You must know the height of the object first. This tool works by looking at the angle of the object. It measures the space between the top and the bottom. This tool is a type of analog computer. An analog computer uses physical parts to solve math problems.

Using the device is a step-by-step process. First, you must set the height of the object. You can do this by turning a knob. Next, you look through the tool at your target. You adjust the parts until the top and bottom align. Then, you read the distance off the edge of a knob. You might use a small magnifying lens to see it clearly. This way, the math happens through the tool's parts.

Bradley Allen Fiske created this device. He was an officer in the United States Navy. He lived from 1854 to 1942. Fiske conducted his first sea tests in 1895. These tests showed the tool was great for navigation. It was also useful for fleet sailing. It helped ships stay at the right distance while moving. The Navy began ordering these tools in the late 1890s.

Many tools were used on warships in the early 1900s. These included the sextant and the spyglass. The stadimeter was part of the standard gear for officers. During World War II, the Navy made a new version. This was called the Mark 5 Mod 0. Schick Inc. of Stamford, CT, made this version in 1942.

It used a pivot arm instead of a slow screw. This made it much faster to use for many objects.

This tool is similar to a sextant. A sextant also uses mirrors to measure an angle. However, a stadimeter lets you dial in the object's height. It is much smaller than some other rangefinders. Because of this, it fits inside a submarine periscope. It is also easy to hold in your hands.

US Navy warships still use them today. They use them when using active radar is not a good idea.

A stadimeter is an optical device used to estimate the range to an object. To use it, you must already know the height of that object. The device works by measuring the angle between the top and bottom of the object. This measurement is taken as the object is observed through the tool. Because it uses physical parts to solve mathematical problems, it is considered a type of analog computer.

Using the device involves a specific sequence of steps to find the distance. First, the operator must set the known height of the target object. In many models, this is done by adjusting a knob. Next, the operator looks through the device at the target. They adjust the parts until the top and bottom of the object align perfectly. Finally, the operator reads the calculated range from the edge of a knob. A small magnifying lens often helps the user see this reading clearly.

This tool belongs to a group of instruments called optical rangefinders. It is very similar to a sextant. A sextant uses mirrors to measure an angle between two points. However, the stadimeter is different because it allows the user to dial in a specific height. One major advantage of the stadimeter is its size. It does not require a large, bulky instrument to function. This makes it ideal for handheld use or for installation inside a submarine periscope.

The history of the stadimeter began with Bradley Allen Fiske. He was an officer in the United States Navy who lived from 1854 to 1942. He originally designed the device for gunnery purposes. He conducted the first sea tests for his invention in 1895. These tests revealed that the tool was useful for more than just combat. It proved equally helpful for fleet sailing and for general navigation.

Following these successful tests, the United States Navy Bureau of Ships began ordering handheld versions. These orders started shortly after the device was developed in the late 1890s. By the early 1900s, the stadimeter became standard equipment for navigation officers. It was used alongside other essential tools like the sextant, the spyglass, and the maneuvering board. It was also used with the parallel motion protractor to help manage warships.

During World War II, engineers developed a more advanced version known as the Mark 5. The Mark 5 Mod 0 was produced in 1942 by Schick Inc. of Stamford, Connecticut. This version changed how the height was set to make it more efficient. Older models used a linear screw worm drive to set the object's height. This screw drive was quite slow to move. The Mark 5 replaced this with a single pivot arm, also called an adjustable arc arm.

This mechanical change provided a significant benefit for sailors. Because the arc arm was faster than the screw worm drive, operators could work more quickly. They could measure multiple objects of different heights in a much shorter time. This was important for the fast-paced environment of naval warfare. The ability to switch between different heights quickly improved the speed of the entire measurement process.

The stadimeter remains relevant in modern naval operations. It is still used aboard United States Navy warships today. Even with modern technology, there are specific times when this optical tool is necessary. For example, sailors use it when using active radar is inadvisable. This shows how a tool designed in the late 19th century still serves a purpose in the modern age of technology.