BAIRD &L TXTLOCK (LONDON) LTD. 



Sole authorised makjrs, 

 Baird & Tatlock (London) Ltd. 



5005-5006 



Section of cup and iron jacket. 

 5005-5006 



5005 s Flash Point Apparatus, Gray's, for heavy mineral oils, improved form, suitable 

 for testing oils to 700 F., complete, with thermometer graduated to 550 F., in 

 mahogany case 



See Soc. of Chem. Ind. Journal, April, 1891, p. 348. 

 5006 s Flash Point Apparatus, Gray's, complete, with thermometer graduated to 700 F. 



(nitrogen filled) . . 

 A5006 5 Extra thermometers for above, ioo-550 F. . . . . . . . . each 



s5006 s ,, nitrogen filled, 300-700 F. . . . . 



DESCRIPTION. 



This apparatus consists of a brass oil-cup, a, of the same dimensions as the oil container used in Government 

 standard petroleum testers (Abel's). On this cup, which is set on a suitable stand, is placed a tight-fitting cap or 

 lid. Through the lid a steel shaft passes, carrying on the top a small bevelled wheel, h, the bevel of which is 

 milled, and on the lower part two sets of stirrers, one of which is below the surface of the oil, and the other in the 

 vapour space above. A horizontal shaft carried on two standards terminates at one end in a bevelled wheel, g, 

 which gears with the other bevelled wheel, h, and at the other end in a disc, c, the outer rim of which is made 

 of bone or other suitable non-conductor of heat, and on this disc is fixed a handle, b, for rotating the shaft. This 

 horizontal shaft carries a collar, e, from which there projects two small pins at diametrically opposite points. By 

 sliding the shaft slightly to the right the bevelled wheels are drawn out of gear, and the pins protecting from the 

 collar put in position for actuating the testing arrangement. On the lid proper there are three orifices, one im- 

 mediately in front of the test-light d, and the other two at either side of it. Above the lid is the sliding cover, s, 

 in which there are two orifices corresponding to those on the fixed lid. When the bevelled wheels are in gear 

 the sliding cover is held in its normal position by the spring at p, and the orifices in the fixed lid are covered. 

 When the sliding cover is moved by bringing the pin e in contact with the pin at p, and turning the disc c about 

 a quarter of a turn round, the orifices in it coincide with those on the fixed lid, and at the same time the test- 

 light d is depressed and brought into position for producing the flash when the proper temperature has been reached. 

 In places where gas is not available the apparatus can be supplied fitted with oil test-jet instead of gas. 



THE FOLLOWING DIRECTIONS MAY BE FOUND USEFUL. 



Fill the oil-cup a up to. the mark inside with the oil to be tested, replace the cap, and insert the thermometer 

 in the tube provided for it. Apply a light to the heating lamp, the heat from which may be applied direct. Light 

 the test-jet also, and adjust flame to about J of an inch in length. During the heating of the oil the stirrers should 

 be moved at short intervals by turning the handle b several times. The more rapidly the oil is heated th oftener 

 the stirrers should be rotated. When nearing the point at which the oil is expected to flash, it is advisable to reduce 

 the rate of heating in order that the observations may be more readily and accurately made. If necessary, a rough 

 test may be performed first, to give some indication of the temperature at which the oil is likely to flash. Observa- 

 tions may be taken every degree or half-degree, a few turns of the stirrer being given between each test. The rate 

 of heating is immaterial, provided it is not too rapid to allow of readings being taken. A convenient time is ten 

 to twentv minutes. 



400 



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CROSS STREET HATTON GARDETST, EC 



