Frictional test of Unknown [Mixed] Oil, March 24, 1880. Rev. per min. 490.46. Pressure per sq. inch 5 lbs. Velocity of rubbing surfaces per minute 571.77 feet. No. of sample, 23. No. of trials, 4.

HHHHHHHHhr

Frictional test of Unknown [Mixed] Oil, May 24-25, 1880. Rev. per minute 471.86. Pressure per sq. inch 5 lbs.

Velocity

of rubbing surfaces per minute 530.84 feet. No. of sample, 24. No. of trials, 4.

Frictional test of Unknown [Mixed] Oil, May 25-26, 1880. Rev. per min. 485.06. Pressure per sq. inch 5 lbs. Velocity of rubbing surfaces per minute 545.89 feet. No. of sample, 25. No. of trials, 4.

Frictional test of Downer Oil Co., Champion Oil, May 27, 1880. Rev. per min. 508.69. Pressure per sq. inch 5 lbs. Velocity of rubbing surfaces per minute 572.27 feet. No. of sample, 28. No. of trials, 5.

Fluidity Experiments. Valvoline White Loom Oil. Leonard & Ellis. Sample 12.

150

120

140

265.5

353.

284.

Temperature.

Seconds required to empty pipette.

60

60

334.

Temperature.

Seconds required

to empty pipette.

Fluidity Experiments. Heavy Spindle Oil.
Sample 14.

Downer Oil Co

140

66.

110

122.5

130

76.

100

149.

120

106.

90

182.

Seconds required
to empty pipette.

8828

Temperature.

Fluidity Experiments.

Ellis. Sample 15.

Temperature.

Seconds required

to empty pipette.

399.