5 Ways To Use A Doyle Log Scale Chart

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The Doyle Log Scale Chart, also known as the Doyle Log Scale, is a widely used and versatile tool in the field of forestry and logging. Developed by E.C. Doyle in the early 20th century, this chart provides a quick and accurate method for estimating the volume of logs. The chart is based on the relationship between the diameter and length of a log, and it takes into account the taper of the log. In this article, we will explore five ways to use a Doyle Log Scale Chart, and provide practical examples and explanations to help you get the most out of this valuable tool.

Understanding the Doyle Log Scale Chart

Before we dive into the ways to use the chart, let's take a brief look at how it works. The Doyle Log Scale Chart is a graph that plots the diameter of a log against its length, with the volume of the log being the intersection of these two variables. The chart takes into account the taper of the log, which is the decrease in diameter from the butt to the top of the log. By using the chart, you can quickly estimate the volume of a log, which is essential for calculating the yield of a tree or a stand of trees.

1. Estimating Log Volume

The most obvious use of the Doyle Log Scale Chart is to estimate the volume of a log. To do this, you need to measure the diameter of the log at the midpoint of its length, and the length of the log itself. Then, using the chart, you can find the intersection of these two values, which will give you the estimated volume of the log.

For example, let's say you have a log with a diameter of 16 inches and a length of 16 feet. Using the chart, you can find the intersection of these two values, which gives you an estimated volume of 150 board feet. This is a quick and accurate way to estimate the volume of a log, which is essential for calculating the yield of a tree or a stand of trees.

2. Determining Log Grades

The Doyle Log Scale Chart can also be used to determine the grade of a log. Log grades are based on the diameter and length of the log, as well as its quality and defects. By using the chart, you can determine the grade of a log and estimate its value.

For example, let's say you have a log with a diameter of 20 inches and a length of 20 feet. Using the chart, you can determine that this log falls into the " premium" grade category, which means it has a high value due to its large diameter and length.

3. Calculating Log Yield

The Doyle Log Scale Chart can also be used to calculate the yield of a tree or a stand of trees. By estimating the volume of each log and adding them up, you can calculate the total yield of the tree or stand.

For example, let's say you have a tree with five logs, each with a diameter of 16 inches and a length of 16 feet. Using the chart, you can estimate the volume of each log and add them up to get a total yield of 750 board feet.

4. Comparing Log Volumes

The Doyle Log Scale Chart can also be used to compare the volumes of different logs. By plotting the diameters and lengths of multiple logs on the chart, you can quickly see which logs have the largest volumes and which ones have the smallest.

For example, let's say you have two logs, one with a diameter of 18 inches and a length of 18 feet, and another with a diameter of 20 inches and a length of 20 feet. Using the chart, you can see that the second log has a larger volume than the first log.

5. Estimating Pulpwood Volumes

Finally, the Doyle Log Scale Chart can also be used to estimate the volume of pulpwood. Pulpwood is wood that is harvested for its fiber, rather than its lumber value. By using the chart, you can estimate the volume of pulpwood that can be harvested from a tree or a stand of trees.

For example, let's say you have a stand of trees with an average diameter of 12 inches and an average length of 12 feet. Using the chart, you can estimate the volume of pulpwood that can be harvested from this stand, which can help you plan your harvesting operations.

In conclusion, the Doyle Log Scale Chart is a versatile tool that can be used in a variety of ways in the field of forestry and logging. From estimating log volumes to determining log grades, calculating log yield, comparing log volumes, and estimating pulpwood volumes, this chart is an essential tool for anyone working in the forestry industry.

What do you think about the Doyle Log Scale Chart? Have you used it in your work or studies? Share your experiences and insights in the comments below!