The planimeter affords a much quicker and more accurate method of obtaining the average steam pressure from a diagram.
Coffin's averaging instrument orplanimeter is shown in Fig.
There are two methods of doing this, one by means of a planimeteror averaging instrument, and the other by means of lines called ordinates.
Amsler's planimeter was taken as the standard, the area measured by it being independently checked by an assistant.
The instrument we are about to describe is an improvement on the hatchet planimeter and is due to Prof.
The method of determining the mean effective pressure is as follows: First measure the area of the card in square inches, by means of a planimeter (an instrument described later), and divide this area by the length in inches.
Planimeter The planimeter is an instrument for measuring areas in general, and especially for measuring the areas of indicator cards.
Diagram for Calculating Steam Consumption] Measuring the card with a planimeter shows the mean effective pressure to be 48.
The simple finding of areas we may omit, as the planimeter will do that equally well.
From this it follows that the error of the planimeter is less than 0.
Excluding such cases, we see that the accuracy of the integraph scarcely falls behind that of the planimeter and is quite efficient for practical purposes.
Amsler has modified his planimeter in such a manner that instead of the area it gives the first or second moment of a figure about an axis in its plane.
To use this simple instrument as a planimeter requires the possibility of selecting the point R.
By aid of a planimeter determine the areas P, P1, P2, of these three curves.
The first planimeter was made on the following principles:--A frame FF (fig.
Hence if the curve is drawn, any planimeter may be used for finding the value of the integral.
In fact, a planimeter may often be used with advantage to solve problems more complicated than the determination of a mere area, by converting the one problem graphically into the other.
In all applications of the planimeter the rod is brought back to its original position.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "planimeter" in a variety of sentences. We hope that you will now be able to make sentences using this word.
