BAIRD &.TATLOCK (LOM)ON) LTD. 



DIRECTIONS FOR TESTING PETROLEUM MIXTURES IN ABEL'S NEW PETROLEUM APPARATUS. No. 4998. 



1. Liquid Mixtures. 



Where the petroleum mixture is wholly liquid, flows quite freely, and does not contain any sediment or thickening ingredient, 

 such mixture shall be tested in the manner set forth in Schedule I. to the Petroleum Act, 1879. 



2. Viscous and Sedimentary Mixtures. 



Where the petroleum mixture contains an undissolved sediment, as in the case of some metal polishes, which can be separated 

 by nitration or by settlement and decantation, the sediment may be so separated and the decanted liquid may be tested in the 

 manner set forth in Schedule I. to the Petroleum Act, 1879. 



In carrying out such separation, care must be taken to minimise the evaporation of the petroleum. The separation of the 

 sediment must not be effected by distillation. 



Where the petroleum mixture is such that sediment cannot be separated by the aforementioned means, or where it is of a 

 viscous nature, as in the case of indiarubber solution, quick-drying paints, etc., such mixture shall be tested in the apparatus 

 modified as shown in the drawing hereto. This apparatus differs from that prescribed in Schedule I. to the Petroleum Act, 1879. 

 only in the addition of a stirrer to equalise the temperature throughout the sample under test. 



In carrying out the test of a viscous petroleum mixture, this stirrer shall be constantly revolved at a slow speed, except when 

 applying the test flame, with the fingers, the direction of revolution being that of the hand of a clock. 



W r ith the exception of the use of the stirrer, the manner of carrying out the test shall be that set forth in Schedule I. to the 

 Petroleum Act, 1879. 



The stirrer may be removed by grasping the spindle just above the blades with the finger and thumb, and unscrewing the 

 upper sheath. The opening in the lid, through which the stirrer passes, may then be closed by a plug provided for the purpose. 



When this has been done, the apparatus shall be deemed to comply with the specification set forth in Schedule I. 

 of the Petroleum Act, 1879, and may be used for testing ordinary petroleum or solid petroleum mixtures. 



A model of the aforementioned apparatus is deposited with the Board of Trade, and the provisions of Section 3 of the 

 Petroleum Act, 1879, in regard to verification and stamping shall apply also to such apparatus as though it were the apparatus 

 prescribed by the said Act. 



For the purpose of carrying out such verification the stirrer shall be removed and the opening plugged as hereinbefore directed 

 The apparatus shall then be tested with ordinary petroleum. The stirrer shall be verified by comparison of measurements. 



3. Solid Petroleum Mixtures. 



Where the petroleum mixture is solid, as in the case of naphtha soaps, etc., the apparatus to be used for the test shall be that 

 prescribed in Schedule I. of the Petroleum Act, 1879. 



The method of carrying out the test of such solid mixture shall be as follows : 



The solid mixture must be cut into cylinders i J in. long and J in. in diameter by means of a cork borer or other cylindrical 

 cutter having the correct internal diameter. These cylinders are to be placed in the petroleum cup of the testing 

 apparatus in a vertical position in such number as will completely fill the cup. The cylinders must be in contact 

 with one another, but most not be so tightly packed as to be deformed in shape. 



Five or six of the cylinders in the centre of the cup must be shortened to J in. to allow space for the thermometer bulb. 

 The air bath of the testing apparatus must be filled to a depth of I J in. with water. The water bath must then be raised 



to and maintained at a temperature of about 75 F. 



The cup must then be placed in the air bath, and the temperature of the sample must be allowed to rise until the ther- 

 mometer in the oil cup shows 72 F. when the test flame must be applied. 

 If no flash is obtained, this temperature must be maintained constant in the oil cup for one hour, at the expiration of 



which the test flame must again be applied. 



If a flash is obtained, the solid mixture will be subject to the provisions of the Petroleum Acts in virtue of this Order. 

 NOTE. It may in many cases save time in testing samples of petroleum mixtures to apply the test flame after the sample has 

 been a few minutes in the cup and while still at the temperature of the room in which the test is being carried out, provided 

 that this temperature is below 73 F. If a flash is obtained by this means, it is unnecessary to proceed with the test at a higher 

 temperature. 



.CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



907 



