SAMPLING AND TESTING HIGHWAY MATERIALS. 51 
The thermometer shall conform to the following dimension's: 
Total length, maximum 3 g 5 " 
Diameter of stem (permissible variation 0.5 mm.) 7 
Diameter of bulb, minimum (shall not exceed diameter oY 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. 2S.— 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 
