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 a s follows: T h e rubber bulb is squeezed a n d 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 t h e upper tube is filled with a suitable quantity,
633
Received May 4 , 1918
The detection of wool in t h e presence of cellulose fihers, in cases where t h e treatment has been such a s t o destroy t h e characteristic appearance of wool and
H
I O cc., of a mixture of ether a n d methylat e d spirit, conveniently taken from a tuhulated hottle, which is fixed just above t h e pipette. Then t h e cock is turned again a n d the oil, followed b y t h e etheralcohol mixture, is run into a flask a n d titrated with alkali. In t h a t way t h e lower tube is cleaned out automatically a n d is a t once ready for a new sample.
for instance,
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 t h e 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 t h e sketch has been found very useful a n d 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 t h e acid from going up into t h e flask by letting air in a n d breaking t h e 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 b o t h above a n d below t h a t of t h e atmosphere. 1822 So. BROADSTPBBT. PBEAD*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
634
T I l E J O U R N A L OF I N D U S T R I A L A N D ENGINEERING CHEMISTRY
cent sodium hydroxide solution. T h e slide is t h e n gently heated over a flame until vigorous boiling j u s t takes Place, whereupon i t is immediately removed and examined under t h e microscope. fibers become greatly in Some partially dissolved, a n d present t h e appearance,
Vol.
IO,
No. 8
whichis characteristic, of bzing full of cells or bubbles. Undyed wool gives a d i r t y yellowish brown color. C o t t o n a n d wood pulp fibers areunchanged except t h a t t h e y becom.: somewhat clearer a n d slightly s h r u n k . RESEARCH LABORATORY, EASTMAN R-,DAKCOMPANY ROCHESTER, N. Y .
1
I
I
I
ADDRESSES
GILMAN HALL: THE RESEARCH UNIT OF THE CHEMISTRY GROUP AT THE UNIVERSITY OF CALIFORNIA By MERLERANDALL Received May 29, 1918
The department of chemistry a t the University of California is now housed in three separate buildings-Chemistry Hall, the Freshman Laboratory, and Gilman Hall. The first is a rambling, vine-covered, red-brick structure, with a fine record of past achievement; the second, a temporary wooden structure; and the third, a massive, reenforced concrete monolith, built as a part of the permanent University along the lines of the Hearst plan. The original building, Chemistry Hall, was built in 1890, and various additions have been mage to it from time to time. The lecture rooms, museum, and the storeroom for all departments are located in this structure. The laboratories are now used by the departments of organic and analytical chemistry for both instruction and research.
FIR57
In 1912 a temporary, three-story, wooden building, known as the Annex, was erected and, until the occupancy of Gilman Hall, was used exclusively for graduate research in physical chemistry. It is to be hoped that the research spirit, so well nurtured in the little annex, will continue to grow in the new quarters. Another three-story wooden building, known as the Freshman Laboratory, was built in 1914for the purpose of accommodating the general introductory course in inorganic chemistry and qualitative analysis. This building is unique in that it is used for the one course only. It contains storerooms, two distributing rooms, and eleven small laboratories, each of which accommodates twenty-five students working simultaneously, thus making room for a total of eleven hundred working in four different sections. The capacity of each laboratory was limited to twenty-five students in order that .each instructor should become intimately acquainted with his students. In 1916-1917 Gilman Hall, the firs%wing of the new chemistry
FLOOR PLAN -lllB-s&s-
'5UB B A S E M E N T P L A N
- B A S E M E N T FIG.I-FIRST
P L A N AND
BASEMENT~FLOORS. GILMAN HALL
