SAMPLING AND TESTING HIGHWAY MATERIALS. 



51 



The thermometer shall conform to the following; dimensions: 



Mm. 



Total length, maximum 385 



Diameter of stem (permissible variation 0.5 mm.) 7 



Diameter of bulb, minimum (shall not exceed diameter of stem) 5 



Length of bulb (permissible variation 2.5 mm.) 12. 5 



Distance from 0° to bottom of bulb (permissible variation 2.5 mm.) 30 



Distance from 0° to 400° (permissible variation 10 mm.) 295 



Fig. 28. — Distillation apparatus with vertical condenser. 



The accuracy of the thermometer when delivered to the purchaser shall be such 

 that when tested at full immersion the maximum error shall not exceed the following: 



°C. 



From 0° to 200° C 0. 5 



From 200° to 300° C 1.0 



From 300° to 375° C 1. 5 



