ļ
THE HONGKONG GOVERNMENT GAZETTE, MARCH 16, 1906.
303
follows:-The oil-cup is to be removed from the water-bath, and the temperature of the water in the water- bath is to be reduced to 95° Fahrenheit by pouring cold water into the funnel (the hot water escaping by the overflow-pipe). The air-chamber is then to be filled to a depth of 13 inches with water at a temperature of about 95° Fahrenheit, the oil-cup is to be replaced in the water-bath, and the spirit-lamp, attached to the water- bath, is to be lighted and placed underneath. The test-flame is then to be again applied, from 96° Fahrenheit, at every degree rise of temperature as indicated by the thermometer in the oil-cup until a flash takes place, or until a temperature of 150° Fahrenheit has been reached. If during this operation the test-flame appears to diminish in size, the lamp is to be replenished in the manner prescribed (at 2) without interrupting the test.
If a flash occurs at any temperature between 76° and 150° Fahrenheit, the temperature at which it occurs subject to correction for atmospheric pressure, is the flashing point of the sample.
In repeating a test, a fresh sample of oil must always be used, the tested sample being thrown away, and the cup must be wiped dry from any adhering oil, and cooled, as already described, before receiving the fresh sample.
5. CORRECTION FOR ATMOSPHERIC PRESSURE. As the flashing point of an oil is influenced by changes in atmospheric pressure to an average extent of 1°6 Fahrenheit for every inch of barometer, a correction of the observed flashing point may become necessary. The true height of the barometer must, therefore, be determined at the time of making the test for the flashing point. To facilitate the correction of a flashing point for pressuret a table is appended, giving the flashing points of oils ranging from 65° to 80° Fahrenheit, under pressures ranging from 27 to 31 inches of mercury.
The table is used in the following mauner :-
EXAMPLE.-Âu oil has given a flashing point of 71°, the barometer being at 286; take the nearest number to 71° in the vertical column headed 28-6. This number is 70.8. Substitute for this the number in the same horizontal line in the columu headed 30 (the normal height of barometer). The Substituted number, i.e. the true flashing point of the oil, is 73°.
TABLE for correction of FLASHING POINTS indicated by the Test for Variations in Barometric Pressure on either side of Thirty Inches.
27
BAROMETER IN INCHES.
27.2 274 276 27-8 28 28/2 284 28-628-8 29 29-2 294 29 6 29 8
FLASHING POINT IN DEGREES FAHRENHEIT.
30
302 304 30-6 30.8 31
60-2 60-5 6-8 61-2 615
612 615 61-8 62+2
62.2 62.5 62.8 | 63:2
62:5 635
63.2 63.5 63.8
642 645
70 2 70-5 70-8 712 71-5 71-8 72.2 72.5 72.8 73.2 73.5 73 8 74-2 745 74-8 75.2 755 75.8
642 645 64.8
652 | 65-5 65-2 655 | 65·8 66-2 | 665 66-2 66 5 66-8 672 676 672 675 67-8 68-2 68-5 68.2 68.5 68.8 69.2 69-5 69.8 70'! 69-269-5 69.8 70-2 70-5 70.8 71.1 712 71·5 718 721 722 72.5 728 781 73-2 73-5 75-8 741 742 745 74-8751 752 755 75.8 76.1 76.4 76-2 765) 76-8 77-1
61.8 628 63 S 64-8 65-1 65-8 66·1 66.8 671 67 8 68-1 68.8 | 691
621 624 62.8 63.1) 63.4 63.7 64 614 64.7 63·1; 63:4 63.8 64.1 644 647 65 654 657 641 64.4 64.8 65.1 654 65.7 66 664 66 7
65
653 | 65-6 66
66.3 66.6
66
66-3 666 67
67.3
67.6
67
67-3 67-6 68
68 3
68.6
654 65.8 66-1 66.4 60.7 *67 671 67 7
68
68.3 68.6 69
69.3
69.6
664 66.8 67 1
67.4 67.7
*68
68.4! 68-7
69
69-369-6 70
70-3 70-6
674 67.8 68.1 684 688 | 69-1 69-4 69.7 69.4 69-8❘ 70-1 70-4 70-7 704 70.8 71.1 71'4 717 72 71.4 71.8 72.1 724 72.7 73 72.4
72.8 731 734 73.7 71 73:4 73.8 741 714 747 75 74.4 74-8 751 754 75.7 75-4 75.8 76-1 76.4 76.7 76-877-1 77.4 77.7 77-4 77.8 78.1 78.4 78.7
68.4 68.7
69
69-469-7
70
70-3 70-6 71
713 71.6
70
70-470-7
71
I
71-1 72-4 72-7 73 4
73.7
71 713 71.6 72 71.7 72 723 72.6 73
73 73:3 73 6 74 74.3 74.6 7+ 743 74 6 75 75.3 75.6
72:3
72.6
73-3 73.6
74.4
74.7
75
753 75-6! 76 76:3 76.6
75 4
75 7
76 76-3 76-6 77
77:3 77.6
76
76.4
76.7
77
77-31 77-6 78
78.3 78.6
77
77.4 77.7
78
783 78.6 79
79.3 79.6
78
78.4 78.7
79
793 79.6! 80 80-3
80.6
79
79.4 79.7
SO
80.3 80.6 81 $1.3
81.6
COUNCIL CHAMBER,
15th March, 1906.
A. M. G. FLETCHER,
Clerk of Councils.
APPOINTMENTS, &c.
COLONIAL SECRETARY'S DEPARTMENT.
No. 216. With reference to Government Notification No. 3 of the 5th January, 1906, it is notified that the following name has been added to the List of Authorized Architects under the Public Health and Buildings Ordinance, 1903-
16th March, 1906.
THOMAS WILLIAM CLARKE.
T. SERCOMBE SMITH,
Colonial Secretary.
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