RAIRD dcTATLOCK (LONDON) LTD. 



that the oil should be quite free from dirt or other suspended matter, and from globules of water, as the jet may 

 be otherwise partially obstructed. If the oil-cylinder requires to be wiped out, paper rather than cloth should 

 be employed, as filaments of the latter may be left adhering. When oils are being tested at temperatures much 

 above that of the laboratory, a gas flame is applied to the copper heating tube, and the agitator kept in gentle 

 motion throughout the experiment. 



NOTE. The jet should be carefully examined before the apparatus is used, and, if necessary, should be cleaned 

 by passing a piece of soft string through it. The apparatus should be adjusted by means of the levelling screws, 

 so that a spirit level placed on the top of the oil-cup shows it to be horizontal. 



METHOD OF EXPRESSING THE RESULTS. 



Sir Boverton Redwood recommends that the number of seconds occupied in the outflow of 50 cubic centi- 

 metres of the oil under examination should be multiplied by 100 and divided by 535 (the number of seconds 

 occupied in the outflow of 50 cubic centimetres of average refined rape oil at 60 F.). The resulting figures should 

 then be multiplied by the specific gravity of tile oil under examination at the temperature of the experiment, 

 and divided by 915 (the specific gravity of refined rape oil at 60 F.) ; the necessary correction for specific gravity 

 being thus made, the final figures will express the viscosity of the oil, at the temperature of the test, in terms of 

 viscosity of refined rape oil at 60" F. 



5014 



5015 



5014 s Engler's Viscometer, with verified measuring flask, capacity 200 cubic centimetres, 

 and thermometers 10 to 50 C. and 10 to 150 C. .. 



5015 Engler's Viscometer, standard pattern, designed by the Petroleum Congress, with 

 measuring flask with two bulbs each 100 c.c., thermometers 10 to 50 C. and 10 to 150 C. 



3 17 

 4 15 



CROSS STREET HATTOTST GARDE1ST, E-C 



914 



