Wishing t o use t h e Roese-Gottlieb method for t h e determination of f a t in evaporated milk a s published in Circular No. 66 of t h e Bureau of Chemistrv. i t was THE ROESE-GOTTLIEB METHOD' side diameter a n d using found t h a t t h e -'Rohrig t u b e s for this purpose could n o t be purchased. None of t h e dealers in chemical glassware of whom inquiries were made, knew a n y t h i n g of t h e m . T h e writer h a d seen t h e t u b e s designed b y M r . P a t r i c k , b u t wished a

more »

... u b e differing from t h e m in some respects. As there is nothing complicated a b o u t these t u b e s , specifications were drawn u p a n d t h e t u b e s ordered from t h e glass-blower. T h e specifications were determined b y sealing t h e end of a glass t u b e of five-eighths of a n inch inthe a m o u n t s of material a n d 85 cubic centimeters, respectively. T h e specifications were as follows: I . Inside diameter of t u b i n g t o be five-eighths of a n inch. Drainage t u b e t o be so placed t h a t t h e b o t t o m of t h e orifice is a t t h e 19.5 cc. point. 3 . Capacity of t h e t u b e t o be 8 5 cc.