Aug., 1918
T E E J O U R N A L OF I N D U S T R I A L A N D ENGINEERIRING C H E H I S T R Y A TEST FOR
PIPETTE USED IN TITRATION OF OILS FOR ACIDITY By 1. J~coessii
WOOL
By H i n a ~L%B. GRAU
Received April 11, 1918
The use is as follows: T h e rubber bulb is squeezed and t h e oil to be examined is sucked into t h e lower tube, which has a capacity of 5 . 5 cc., i. e., 5 g. of oil. The cock is turned a n d the upper tube is filled with a suitable quantity,
633
Received May 4 , 1918
The detection of wool in the presence of cellulose fihers, in cases where the treatment has been such as t o destroy the characteristic appearance of wool and
H
for instance, I O cc., of a mixture of ether and methylated spirit, conveniently taken from a tuhulated hottle, which is fixed just above t h e pipette. Then the cock is turned again and the oil, followed b y the etheralcohol mixture, is run into a flask and titrated with alkali. In t h a t way the lower tube is cleaned out automatically and is a t once ready for a new sample.
Pie. I-CBARACTB~ISTIC APPEARANCK o ~ WOOL i h s ~ ~n T K TR n a ~ r x ~ ~ r M&GX*PIC&IIOX = 100
where the fibers have he-n dyed in dark colors, is exceedingly difficult. In such cases t h e following method of procedure has b e e n j o u n d satisfactory.
AIAAIIGO ~ m a ~ a n rLTO. s. AIXWJS. D B N X A ~
A SAFETY VALVE BY E. R ~ T B N ~ O V S E Received December 17, 1917
The safety valve shown in the sketch has been found very useful and may he of interest to other chemists. It is very easy to make and quite reliabie. The valve is intended for use in a distilling flask when determining ammonia by absorption i n standard acid solution. It will prevent the acid from going up into t h e flask by letting air in and breaking the vacuum. T h e valve is made cntirely of glass with a o u U f f e f d r o p of mercury in the hulb. It is very effective, never sticking, always set. Mercury The principic, namely, t h e pressure due t o a column of mercury, can he adapted to all low-pressure work both above and below t h a t of t h e atmosphere. 1822 So. BROADSTPBBT. PB~D*LPBII
he. 11-WOOL
-
CHLLVLOSE h n e n s AFTER T n z n r w ~ ~ i MAGNIFICATION 100
AVO
The fibers to he examined are placed on a microscope slid- and 'covered with two drops of a 3 0 per
