Brooke Martin
The candle clock is an ancient time-telling device that uses a candle's burn rate to measure time. It was used before the invention of mechanical clocks, serving as an early alarm clock and timer. Candle clocks were calibrated with markings to indicate the passage of time as the candle burned down. The earliest reference to candle clocks dates back to 520 CE, and they continued to be used for timekeeping until the advent of electricity. Candle clocks hold historical significance as mankind's creative solution to telling time before the development of modern clocks and chronometers.
| Characteristics | Values |
|---|---|
| Use | Candle clocks were used to tell the time when sundials were not practical, such as at night or on cloudy days. |
| History | The first written mention of candle clocks was recorded in 900 A.D., but they were probably in use even earlier. The earliest known reference is found in a poem by the Chinese poet and thinker You Jiangu (520 CE). |
| Notable Users | English King Alfred the Great is widely known for having used the device to divide his day into blocks of time reserved for different purposes like his royal duties, studies, and sleep. |
| Notable Designs | Al-Jazari's candle clocks from 1206 A.D. are considered the most sophisticated design. They included a dial to display the exact time, and a bayonet fitting and fastening mechanism that is still used today. |
| Calibration | Candle clocks are calibrated by burning two identical candles side by side and marking one at regular intervals based on the other's burn rate. Different types of candles burn at different rates depending on their size and composition. |
| Accuracy | The rate of burning of candle wax is almost constant, allowing candle clocks to indicate the passage of time with reasonable accuracy. However, imperfections in construction, uneven melting of the wax, and draughts can introduce errors in time measurement. |
| Converting to Timer | A candle clock can be converted into a timer by inserting a heavy nail at the desired interval. When the candle burns down to that point, the nail falls and makes a sound, signalling the end of the time interval. |
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What You'll Learn
- Candle clocks were used as alarm clocks before electricity
- They were also used to tell the time at night or on cloudy days
- The earliest known reference to a candle clock is in a poem by You Jiangu in 520 CE
- Candle clocks were used by English King Alfred the Great to divide his day into blocks of time
- To calibrate a candle clock, you need two identical candles, a marker, and a regular clock or watch
Candle clocks were used as alarm clocks before electricity
Before the advent of electricity, candle clocks served as a clever way to tell time and set alarms. The earliest known reference to candle clocks is found in a poem by the Chinese poet You Jiangu in 520 CE. He described six uniform candles, each 12 inches tall, marked in one-inch sections. Each candle would burn for four hours, with each marking representing 20 minutes. These candles were enclosed in wooden cases with transparent horn panels to protect the flame and allow for observation.
Candle clocks were used when mechanical clocks had not yet been invented, providing a relatively accurate means of measuring time duration. The rate at which candle wax burns is nearly constant, allowing candle clocks to indicate the passage of time with reasonable precision. This ancient technology remained in use through at least the 18th century, even as traditional wound clocks became more common.
To convert a candle clock into an alarm, people would insert a heavy metal nail at a desired time interval. As the candle burned down, the nail would eventually fall into a metal plate at the base, creating a clattering sound to signal the end of the time interval. This simple design was likely the easiest alternative for waking up early compared to factory whistles, street criers, or roosters.
One notable example of a sophisticated candle clock design is attributed to Al-Jazari in 1206 AD. His clocks utilized a system of pulleys, weights, and counterbalances to move a series of automata that displayed the time. Al-Jazari's candle clocks are considered the most complex ever created, featuring a dial to show the exact time and a fastening mechanism still used today.
Candle clocks hold a special place in history as a reminder of a simpler time when life was measured by the burning of a candle. While their function as alarm clocks may be obsolete now, they represent an important chapter in the evolution of time-telling devices.
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They were also used to tell the time at night or on cloudy days
The candle clock is an ancient invention, one of the earliest attempts made by humans to measure time. It was used to tell the time at night or on cloudy days when sundials were useless. The earliest written mention of candle clocks dates back to 900 A.D., although they were probably in use even earlier. English King Alfred the Great is known for using the device to divide his day into blocks of time for different purposes, such as royal duties, studies, and sleep.
Candle clocks were used before the invention of mechanical clocks. They provided a means of measuring the duration of time that had passed. Since the rate at which candle wax burns is almost constant, these clocks could indicate the passage of time with reasonable accuracy.
Candles used for candle clocks were marked at regular time intervals. As the candle burned down, one could tell how much time had passed based on the markings. The markings on a candle are set to measure the passing of the hours. When a candle has burnt the wax between two marks, an hour has passed. The thicker the candle, the longer it takes to burn. Therefore, a thicker candle is needed to measure long periods of time, whereas a thinner candle is more suitable for measuring smaller time increments.
Candle clocks could also be converted into timers by inserting a heavy nail into the candle at the desired interval. When the candle burned down to that point, the nail would fall and clatter onto a metal plate at the base, signalling the end of the time interval. Alternatively, a spring-driven alarm clock could be used, where the burning of a candle would release a flint-lock mechanism, causing a candle to spring into an upright position.
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The earliest known reference to a candle clock is in a poem by You Jiangu in 520 CE
The candle clock is an ancient invention, one of the earliest attempts made by humans to measure time. The first recorded reference to a candle clock was in 520 CE in a Chinese poem by You Jiangu. The poem describes six uniform candles of equal weight and thickness, each 12 inches tall. The candles were marked in sections of one inch, with each inch taking 20 minutes to burn and an entire candle lasting four hours.
You Jiangu's device consisted of six candles made from 72 pennyweights (24 grains each) of wax. Each candle was 12 inches high, of uniform thickness, and divided into 12 sections, each one inch long. The candles were enclosed in wooden cases with transparent horn panels on the sides to protect them from being blown out and to allow the user to observe the candles inside.
The invention of the candle clock provided ancient civilizations with a near-accurate way of measuring time. While candle clocks are no longer used today, they were an effective way to tell time indoors, at night, or on cloudy days. They were also used as alarm clocks, with metal nails inserted into the candle at a desired time interval. Once the wax melted at the desired level, the nail would fall into the metal base, creating a sound to wake the user.
Candle clocks were used for time-keeping long before the advent of the mechanical clock. They were used in medieval churches in Europe and Japan during the first millennium CE. King Alfred the Great of England was also thought to have used this method of time-keeping.
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Candle clocks were used by English King Alfred the Great to divide his day into blocks of time
Candle clocks are ancient inventions that were used to measure time before the invention of mechanical clocks. They were used in China as early as 520 CE, and the earliest known reference to their use is found in a poem by the Chinese poet and thinker You Jiangu. Candle clocks were also used in Japan until the early 10th century.
In the 9th century, King Alfred the Great of Wessex used candle clocks to divide his day into blocks of time. According to the 12th-century chronicler William of Malmesbury, King Alfred divided his day into three eight-hour blocks for writing, reading, and prayer; refreshment of his body; and dispatching the business of his realm. There was a candle in his chapel that consisted of 24 divisions, and an attendant whose duty it was to admonish the king of his duties by its consumption.
The candle clock used by King Alfred the Great likely worked by inserting a heavy nail or tack into the candle at the desired interval. As the candle burned down to that point, the nail would clatter down onto a metal plate at the base, signaling the end of the time interval. This would allow the king to keep track of time and manage his daily routine effectively.
The use of candle clocks provided a relatively accurate way to measure time before the invention of mechanical clocks. They were used by various civilizations, including the Anglo-Saxons, and played an important role in the history of timekeeping. However, they also had limitations, such as the uneven melting of wax and imperfections in construction, which could introduce errors in time measurement.
Candle clocks were eventually replaced by mechanical and digital clocks, but they hold a place of historic significance as one of the first timekeeping devices. They represent mankind's creativity and perseverance in solving the problem of telling time throughout history.
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To calibrate a candle clock, you need two identical candles, a marker, and a regular clock or watch
Candle clocks are an ancient invention, predating the invention of mechanical clocks, and were used as a way to measure time. They are thought to have been first mentioned in 900 A.D. and were used by English King Alfred the Great to divide his day into blocks of time.
Now, measure the distance between each of the marks. This will tell you how much that particular candle burns in one minute. You can then make marks at that exact distance and know how much time has passed between each mark. It is important to label each line with a number so that you know how many marks the candle has passed as it burns.
Remember that this method will only work for that specific type of candle. If you use a different size or material for your next candle clock, you will need to calibrate it again. The thicker the candle, the longer it will take to burn, so if you want to measure smaller time increments like minutes, use a thinner taper candle. If you want to measure longer periods of time, like hours, use a pillar candle with a wide diameter.
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Frequently asked questions
A candle mark is a marking on a candle that indicates the passing of time. Candles with these marks are known as candle clocks and were used in the past to measure time at night or on cloudy days when sundials were not useful.
Candles are marked at regular time intervals. As the candle burns down, one can tell how much time has passed based on the markings. The thicker the candle, the longer it will take to burn, so pillar candles are used for measuring longer periods of time, while taper candles are used for smaller time increments.
To calibrate a candle clock, you need two identical candles, a marker, and a regular clock or watch. Place the two candles side by side and light one of them. Time it for one minute and when the minute is up, mark the second candle at the level of the burned candle. Continue timing one-minute intervals and marking the unburned candle. Now you can make marks at that distance and know how much time has passed between each mark.
