|
|
Using the Vernier ScaleIn this lesson you will need to read the dial with precision to 1/100th of a gram.
Next, we need to estimate the hundredths place using the Vernier scale. To use this Vernier scale, you look at the stationary (Vernier) scale marks to see which of them matches best with the corresponding Standard scale mark. In this case it's the sixth one (allowing for digital distortion), so that gives you 6 as the hundredths place. Therefore, the weight shown on the dial is 4.46 grams. If it looks to you more like 4.45 don't be concerned, that is because of the resolution on the screen. If you have any problems seeing how we came up with 4.46 grams, take a look at Example 6 in your workbook.
E-mail instructor: Eden Francis Clackamas Community College
|
In reading the weight on the dial, there are two sets of numbers
to work with, the numbers on the dial itself and the numbers on the stationary plate above
it. These slide past one another just like the Vernier scale you looked at earlier. The
stationary plate is a modified Vernier scale. Instead of 10 (actually .10) on the Vernier
scale being equal to 9 on the Standard scale, it is equal to 1.9 on the Standard scale.
The zero mark on the stationary plate is the reference point that you use to read the
weight on the dial. 
Look at the setting on this dial now. (This is also diagrammed in
Example 6 in your workbook.) The stationary (Vernier) zero is between 4 and 5 on the dial,
so the weight is between 4 and 5 grams. Each of the 10 divisions between the 4 and the 5
represents 1/10th of a gram. Since the stationary (Vernier) zero mark is between the
fourth and the fifth division, the weight is between 4.4 and 4.5 grams.