94 DEPARTMENT BULLETIN 1216, U. S. DEPT. OF AGRICULTURE 
Standardization : The thermometer shall be standardized immersed in the 
testing bath to the top of the mercury column at the ice point and at tempera- 
ture intervals of approximately 50° C. or 100° F. up to 370° C. or 700° F. 
Test for permanency of range: After being subjected to a temperature 
between 360° and 370° C. or 680° and 700° F. for 24 hours, the accuracy shall 
be within the limit specified. 
Case : The thermometer shall be supplied in a suitable case on which shall 
appear the marking : "A. S. T. M. high distillation. 0° to 400° C." or "A. S. T. M. 
high distillation. 30° to 760° F.," according to the type of thermometer. 
Xote. — For the purpose of interpreting these specifications the following definitions 
apply : The total length is the over-all length of the finished instrument. The diameter 
is that measured with a ring gauge. The length of the bulb is the distance from the 
bottom of the bulb to the beginning of the enamel backing. The top of the thermometer 
is the top of the finished instrument. 
Note. — Inasmuch as those dimensions given above which differ from the corresponding 
dimensions that appeared in methods D 38 until their revision in 1924 are of such a 
nature as to affect the facility of making but not the accuracy of the thermometer, any 
thermometer now in use complying with the former requirements of D 38 shall be 
accepted as satisfactory by producers and users of creosote oil ; provided that all 
thermometers hereafter purchased shall be in accordance with the new requirements. 
<- Thermo meter 
U 38.75 cm. ->| 
\- Capper 
>i 3.7"±0.2"K Stilt 
(34.0 mm ±5.1 mm.) 
Condenser 
Separator/ 
Funnel, - 
( Capacity 
120 cc.) 
Graduated 
^ 
JU-¥ 
Fig. 38. — Assembled apparatus for water test 
(c) Condenser. — A copper trough condenser shall be used, with straight-walled 
glass tube, having approximately the form and dimensions shown in Figure 3S. 
(d) Separatory funnel. — A separatory funnel of the form shown in Figure 38 
shall be used, having a total capacity of 120 cubic centimeters and the outlet 
graduated in fifths of a cubic centimeter. 
3. The apparatus shall be set up as shown in Figure 38. 
4. When any measurable amount of water is present in the distillate below 
210° C. as determined in accordance with the tentative method of test for dis- 
tillation of creosote oil (serial designation D 246-27 T) of the American Society 
for Testing Materials (5) (see page 98) the oil and water in this fraction 
shall be separated, if possible, and measured separately. If more than 2 per 
cent of water is present, or if the water is apparently present to an extent in 
excess of 2 per cent, but an accurate separation is impossible, the percentage 
