BAIRD &TATLOCK (LONDON) LTD. 



Reading the Percentage of Moisture. 



The small graduated cylinders for measuring the moisture should have a capacity of at least twenty-five ^centimetres. 

 They should bewrefully graduated in fifths, so that the readings can readily be made m tenths ^ f mo^ture^ridnaHv con 

 for the test, the number of cubic centimetres of water in the graduate corresponds ^^^^^S^. 3met res of 

 tained in the sample. If only 50 grammes are used, as is necessary with some substances, the number 

 water in the graduate is equivalent to one-half of the moisture percentage. 



Fig. 4. Graduated Measuring Cylinder, showing 20 per cent, of moisture. 

 Graduated Measuring Cylinders. 



The standard cylinders for measuring the moisture have a capacity of twenty-five cubic centimetres (see Fig. 4), and; 

 carefully graduated in fifths so that the reading can readily be made to tenths, all readings being made directly in per cent., unless 

 other than 100 grammes are used for the test. In making the moisture determinations a small quantity of the oil is carried over into 

 the measuring cylinder and collects on the surface of the water, so that the reading should be made at the bottom of the meniscus 

 between the oil and water, as shown in Fig. 4. Should the oil and water not separate readily, whirl the graduated cylinder by 

 rolling quickly between the two hands. 



After each test the graduated cylinders should be cleaned, for which purpose we recommend swabs with sponge tips and rattan 

 handles, as shown in Fig. 5. 



HBBtfiS 



Fig. 5. Swab or Test Tube Cleaner. 



Thermometers. Graduated in degrees to 200 C., 13 in. long by 9.32 in. diameter. 

 Balance. While not a part of the apparatus a balance is necessary for weighing the samples. 



Nineteen Important Points. 

 In making tests special attention should be given to the following points : 



1. The moisture tester should be installed in a place where it will not be exposed to strong air currents. 



2. The testers can be equipped for burning alcohol or gasoline, but gas is to be preferred whenever available. 



3. The wire gauze, with asbestos centre, should be kept in good condition, so that the flame does not play directly on 

 the bottom of the flask. 



4. The bottom of the flask should be not less than of an inch above the wire gauze. 



5. See that the column of mercury in the thermometer is continuous ; if broken, it should be shaken down. 



6. Adjust the thermometers in the rubber stoppers so that the bulbs of the thermometers will be approximately four- 

 fifths immersed in the oil. 



CROSS STREET HATTOTST GARDETST, E-C 



1034 



