}
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 fummel (the hot water escaping by the overflow-pipe). The air-chamber is then to be filled to a depth of 14 inches with water at a temperature of about 93° 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 iudicated 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 16 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 manner :—
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 borizontal 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 28 282 284 28-6128.8 29 29-229-4 296 29-8 30
FLASHING POINT IN DEGREES FAHRENHEIT.
30-2 304 30-6 30-8 31
60-2 605 608 | 612 61:5
61.862-1
62.4 62.8 63′1 | 634
63.7
64
611 647
65
65.3 65-6 66 66.3 66.6
612 61-561-8 62.2 62.5
62 8 68.1
63.4 63-8 641 644
647
65
654 65 7
66
60.5 606 67 67.3
67.6
62.2 62.5 628 632 635 | 638 642 645 648
63-2 | 635
63 8 641
644 64-8 651| 654
65-7
66
664 66 7
67
67.3 67.6 68
68 3
68.6
73-2735 73 8
642 | 645 652 653 65-2655| 65·8 | 66-2❘ 665 66.8 66-2 66 5 66-8 672 67.6 67 8 67-2 675 678 68-2 68-5 68-2 685 68-8 69-2 69-5 69-269-5 69-8 | 70-2 | 70-5 70-2 | 70-5 70-871-2 71.5 712] 715 71-8 | 722' 725 72.2 72.5 72-8 7321 735
74-2 745
74-8
75.2 755 75.8
76-2
64.8 651 654 65.8 66-1 65.4 66.7 65-8 66-1 664 66-8 67 1 674 67-7 67.1 67-4 67.8 68.1 684 68-7 68-1 68-4 68.8 69.1 69-4 69.7 70 68.8 69.1 69.4 69-8 70-1 704 70-7 71 69.8 70! 704 70.8 71.1 71.4 717 72 708 711 714 71-8 72.1 724 72.7 78 71872-1 72.4 72.8 73.1 734 73-7 74 728 73-1 73:4
73.8 74.1 714 747 76 758 741 74.4 74.8 75175 4 76-7 74 2 74.5 74.8 751 75.4 75.8 76.1 76:4 76.7 75.2 755 75.8 76-1 76-4 76-8 77.1 77.4 77.7 76-576-8 77.1 771 77.8 78.1 78.4 78.7
67
674
67 7
68
68.3 68-6 69 69.3
69.6
*68
68-448-7
69
69-3 69-6 70
70.3 70.6
69
694 697
70
70-3 70-6 71 713
71.6
76
77
70-4 70.7 71 711 71.7 72 72-472-7 73 73 4 73.7 7+ 74.1 74.7 75 75 4 75.7 76 76.4 76.7 77-477-7
71-3 71-6 72 723 726 73 73.3 73.6 74:3 74 6
72.3 72.6
73-3 73.6
74 75
74.3 74.6
753 75.6
753 756 76
76-3 76.6
76-3 76-6 77
77-3 77.6
77 77:3 77.6
78
78.3
78.6
78 | 783786
79
79.3
79.6
78
78.4 78.7
79
79-479-7
79 79:3 79.6 SO
80 80.3 80.6
80-3 80.6 81 81.3 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.