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

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299.3 29.6
301.6
26.1

300.5

Variation per||

cent, on aver

age of day.

9.8

8.5

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Complete Results of the First, Second and Third Tests.
Full Test on Corrected Basis.

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48

105.1

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48

105.7

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105.4

48

| 119.3 | 12.3

10.3

AVERAGE P. S.

All

1906.

TEMPERATURES.

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Days Transmission. Out- Room Spindle Per C't Engine Spindle
Full
Humid-
Load.
ity.

Tuesday, Mar. 20, 344.1
Wednesday, Mar. 21, 343.1
Thursday, Mar. 22, 336.9

Average

side.

A M. P. M.

54

341.36 141.3 118.24 4.13 17.3

2d Test.- New Oils. Tuesday, June 26, 301.0

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SPEEDS.

Rel'tive

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4

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58

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3.4

16.0

27.8 58

69.23

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22.5

Average... 290.46 106.8

28.3 65 27.8 32.1 58.4 22.4 25.0 29.3 63.4 95.6 23.16 25.1 29.9 62.27

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3d Test.- New Oils.

Tuesday, Nov. 13, 298.5

Wednesday, Nov. 14, 300.0 119.3 105.7 9.7 19.8 22.8 61.7 69.39

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Results Between the First Test and the Third Test.

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The Effect of Temperature or the Difference Between the Second

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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.

1904.

1905.

1904.

Test No. 11.

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. First Test.

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Difference of Averages 11.2 P. S. or 1 per cent. on Average of Test.

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

Mill Oils.

Engine and Transmission.

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

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Test made at Ostritz, Germany.

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

Result.

Full Mill Load.

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.

MILL OILS.

Engine and Transmission.

Average of December 20, 22, 1904, . . NEW OILS. Average of February 28, March 1, 1905,

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Reduction, ..

or 9.51 per cent.

I.P.S.

1,135.2 1,034.2

101.0

I.P.S.

362.6

328:1

34.5

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Variation per

cent. on aver

age of day.

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