i86 
bulletin of the bureau of fisheries. 
A viscosimeter capable of very accurate measurement gave satisfactory service in 
our previous work ® and a new one was made and calibrated according to the method 
already given. Following are the constants obtained for this instrument: 
Length of capillary (approximate). . 
Volume of left limb 
Volume of right limb 
Pressure correction (30°), left limb. . 
Pressure correction (30°), right limb 
Ratio of to ^ 
The formula used for the calculation of the viscosity was 
Tcr'^pt vd 
Svl 
1. 6 cm. 
2. 1310C. c. 
2. 0748 c. c. 
— o. 30 cm. 
— . 30 cm. 
• 00005835 
. 00005822 
. 00005837 
where n is the viscosity, r the radius, and I the length of the capillary, v the volume 
of liquid passing through the capillary, d the density of the liquid, p the pressure, and 
t the time of flow. As has been stated, the method of calibration and manipulation has 
been fully described in previous papers. 
In the following tables are presented the results of the viscosity measurements, 
which were taken at 30°, 50°, 70°, and 90°, for the right and left limbs, the average 
of the two, and the reciprocal of the latter value, which is the fluidity. The China-wood 
oil was measured at 35° and the value at 30° extrapolated from the curve, as the oil was 
so viscous at the lower temperature that the time necessary for a determination was 
very long. The pure oils were cooled after measurement at 90° and the viscosity 
redetermined at 30° to note any possible change due to chemical decomposition. 
Table I. — Dogfish- Liver Oil. 
Temperature. 
Viscosity. 
Fluidity. 
Right limb. 
Left limb. 
-Average. 
Degrees. 
30 
0.4143 
0. 4140 
0. 4142 
2.414 
50 
.2113 
. 2110 
. 21X2 
4 - 735 
70 
• 1247 
• 1247 
■ 1247 
8. 020 
90 
. 08046 
. 08063 
.0805s 
12. 41 
30 
.4142 
.4142 
.4142 
2.414 
Table H. — Linseed Oil. 
Temperature. 
Viscosity. 
Fluidity. 
Right limb. 
Left limb. 
Average. 
Degrees. 
30 
0.3512 
0. 3311 
0. 3312 
3 - 019 
50 
• 1757 
• 1757 
• 1757 
5.692 
70 
. 1071 
. 1069 
. 1070 
9-346 
90 
.07103 
. 07119 
. 07111 
14. 06 
30 
•3312 
.3316 
•3314 
3- 016 
® White, G, F., op. cit. 
