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Both Room Temperature and outside Temperature are greatly in favor of a reduction in friction.

The Relative Humidity during the second test (62.27 per cent.) was 4.97 per cent. higher, which would mean that the power should be higher, due to this cause, than during the first test, if everything else was equal.

As this test stands, however, the higher Relative Humidity probably will equalize the effect of the considerable increase in Room Temperature.

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300.5 Difference of Averages 2.3 P.S. or 8 per cent. on Average of Test.

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Complete Results of the First, Second and Third Tests.

Full Test on Corrected Basis.

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1st Test.-Mill Oils.
Tuesday,
Mar. 20, 344.1

117.4 5

18.6 Wednesday, Mar. 21, 343. I 141.3

4 17.3 Thursday, Mar. 22, 336.9

119. I 3.4 16.0 Average 341.36 141.3 118.24: 4.13 17.3 2d Test.-New Oils. Tuesday, June 26, 301.0

2012

97.2 20.7 22.5 Wednesday, June 27, 284.1 106.8

94.1 26.4 Thursday, June 28, 286.3

22.4 25.0 Average 290.46 106.8

95.6 23.16 25.1 3d Test.- New Oils. Tuesday, Nov. 13, 298.5

105.1 8.9 19. I Wednesday, Nov. 14, 300.0 119.3 105.7 9.7 19.8 Average

299.30 119.3 105.4 9.3

27.8

28.3 65
32. I

58.4
29.3 63.4
29.9 62.27 | 69.44

69.43
69.45
69.45

2012

62.3 61.7

69.16

22.4
22.8

2055

69.39

19.45| 22.6

62.0

69.27

2055

Averages of the Three Tests.

Full Load.

Rel'tive
Transmission. Temperatures.

Speeds.
Per

Cent.

Room Spindle Humid-
A. M. P. M. Outside

Engine Spindles
C

С ity.

P. S.

First Test
Second Test
Third Test.

341.36 141.9 118.24 4.33
290.46 106.8 95.60' 23.16
299.30 119.3 105.41' 9.30

17.3
25. I
19.5

28.8 57.33 69.23 1982 29.9 62.27 '69.44 2012 22.6

62.00 69.27 2055

Results Between the First Test and the Third Test.

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The Effect of Temperature or the Difference Between the Second

and Third Tests.

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The Humidity was practically the same, 62.27 per cent. for the Second Test and,

62.0 per cent. for the Third Test. A reduction of, .

13.86 °C.(59.8 per cent.) Outside temperature effects the inside temperature so that it falls, ....

5.56 °C. (22.2 per cent.) This reduction in room temperature increases the total power,

8.86 P.S. or 3 per cent. On this one mill it appears that a reduction in room temperature of 5.56 °C. increases the power 3 per cent.

This is not allowing for the fact that the bearings always run to better advantage after having been lubricated with a good oil. This is proven by the fact that the actual temperatures of the spindles (the difference between the total temperature and the room temperature), which is a good indication of their frictional losses, were 11.5 °C. for the first test, 4.8 °C. for the second test, and 3.15 °C. for the third test.

Test No. 11.

Test made at Ostritz, Germany.

POWER TEST ON A JUTE SPINNING AND WEAVING MILL. Engine - Compound Engine by Hartmann, Chemnitz. Engine having Poppet

Valves. Steam Pressure 7 Atmospheres, 63 R. P. M. 1,000 P. S. Machinery Operated Preparing, spinning and weaving with all intermediate

machines, for the purpose of making heavy jute bagging and stuff. Complete Test - 6 days. 4 indicators. 1,056 indicator cards. 3 operators.

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1135.2 Difference of Averages 11.2 P. S. or i per cent. on Average of Test.

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1034.2 Difference of Averages 23.5 P. S. or 2.3 per cent. on Average of Test. Mill Oils.

Engine and Transmission.

1904.

age of day. if

Tuesday, December 20,

373.8

348.5 40 363.5 25.3 Thursday, December 22,

7.0 367.0 357.2 40 361.9 9.8

2.7

362.6 Difference of Averages 1.6 P. S. or 0.44 per cent. on Average of Test.

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Variation per
cent.on aver-
age of day.

I,

4.6

Tuesday, February 28,

337.8

323.9 40 Wednesday, March

328.7 13.9 4.2 353.4 337.6 40 347.4

15.8

328.1 Difference of Averages 18.7 P. S. or 3.7 per cent. on Average of Test.

Result.

Full Mill Load.

.

1.P.S. 1,135.2 1,034.2

Mill Oils. — Average of December 20, 21, 22, 1904, . .
New Oils. — Average of February 28, March 1 and 2, 1905,
Reduction, .

or 8.89 per cent.

IOI.O

Engine and Transmission.

I.P.S.

.

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Mill Oils. — Average of December 20, 22, 1904,
NEw Oils. — Average of February 28, March 1, 1905,
Reduction, .

or 9.51 per cent.

34.5

Mill Oils.

Average Speeds of Engines.

December 20, 1904,
December 21,
December 22,

9.00 to 11.30

63.0 63.1 63.2

2.00 to 3.20

63.0
63.0
63.0

4.40 to 5.20

63.0 63.3 62.8

63.1

63.0

63.0

New Oils.

63.4

February 28, 1905,
March

I,
March 2,

62.8
63.5
63.6

68.8

63.4 63.5 63.2 63.4

63.3

63.6

R.P.M.

Mill Oils. — First Test Average,
NEW Oils. Second Test Average,

Increase in Speed,

.63.03 63.43

•40

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