6
Specific Gravity determinations are easily made on the
balance. Swing the pan support and pan out of the way.
Raise the specific gravity platform to the desired position
by grasping the round end. Release platform at desired
elevation and it will lock in that position.
SPECIFIC GRAVITY DETERMINATIONS (C
SPECIFIC GRAVITY DETERMINATIONS (C
SPECIFIC GRAVITY DETERMINATIONS (C
SPECIFIC GRAVITY DETERMINATIONS (C
SPECIFIC GRAVITY DETERMINATIONS (Cont
ont
ont
ont
ont.)
.)
.)
.)
.)
Figure 9. Example of 183.6 Gram Reading
Figure 10.
READING THE VERNIER - Model 310
READING THE VERNIER - Model 310
READING THE VERNIER - Model 310
READING THE VERNIER - Model 310
READING THE VERNIER - Model 310
Each graduation on the dial has a value of 0.1 gram. A vernier adjacant to the dial
breaks down these values in 0.01 gram increments. To read the vernier, read the
nearest gram value to the right of the zero vernier graduation. Add to that the vernier
graduation value at the vernier line which most closely lines up with any of the other
dial graduations. Figure 8 indicates a reading of 6.74 grams.
Figure 8. Vernier Dial Reading of 6.74 Grams.
6.70 gram Graduation
Zero Vernier Graduation
0.04 gram Vernier Graduation
Dial
Vernier
Model 311
Model 311
Model 311
Model 311
Model 311
1.
Working from the rear beam forward, move the 200 gram poise on the rear beam
to the first notch which causes the pointer to drop, then move it back one notch,
causing the pointer to rise
2.
Repeat this procedure with the 100 gram poise.
3.
Repeat this procedure with the 10 gram poise.
4.
Slide the 1 gram poise to the position which brings the pointer to zero. The weight
of the specimen is the sum of values of all poise positions, read directly from the
graduated beams. See Figure 9.
NOTE: With a little practice, you will become proficient in learning exactly how fast to
turn the dial to come exactly to balance position the first time.
Shortcut procedures may be used in instances where approximate weight of the
specimen is known, as follows:
For specimens less than 100 grams, omit step 1.
For specimens less than 10 grams, omit steps 1and 2.
For specimens less than 1 gram, omit steps 1, 2 and 3.
