NEW PRODUCTS exceptionally long working distance of t h e objectives, t h e i n s t r u m e n t m a y b e used with D e w a r flasks or other b u l k y containers. T h e wide range of reflect ing objectives available ( X 1 5 t o X172) p e r m i t s use of t h e microscope i n i n v e s tigations n o t practical in t h e past, says t h e company. 12 Portable M o i s t u r e Determinator A new a p p a r a t u s for moisture deter mination is announced b y t h e Central Scientific C o m p a n y . Called t h e Cenco K a r l Fischer Moisture D e t e r m i n a t o r , i t is said t o be completely self-contained, including all t h e e q u i p m e n t necessary for accurate moisture determination, except t h e pipcts a n d chemicals. F i t t e d in a compact, plastic-covered wooden case, t h e i n s t r u m e n t weighs 22
p o u n d s a n d permits analysis of liquids, solids, a n d gaseous samples w i t h o u t re moving t h e basic a p p a r a t u s from t h e case. I t can be operated wherever 115 volt, 50 cycle current is available. 13 A u t o m a t i c A p p a r a t u s f o r Titrations T i t r a t i o n s can now b e carried o u t a u t o m a t i c a l l y with t h e A u t o m a t i c K a r l Fischer A p p a r a t u s developed b y Baird & Tatlock (London) L t d . Merely press a b u t t o n to s t a r t t h e titration, wait for t h e red light which signifies completion of t h e titration, a n d read the burettes. T h e a p p a r a t u s includes t w o b u r e t t e s , p e r m i t t i n g forward t i t r a t i o n with t h e K a r l Fischer reagent a n d back t i t r a t i o n with m e t h a n o l / w a t e r solution. Filling or refilling t h e b u r e t t e s is done a u t o matically b y t u r n i n g a switch to t h e a p propriate position. Among t h e a d v a n t a g e s claimed for t h e a u t o m a t i c t i t r a t o r a r e : accuracy and repeatability d u e to elimination of t h e h u m a n element involved in m a n u a l l y operated t i t r a t i o n s ; economy of time VOLUME
2 8, N O . 1 2 , D E C E M B E R
since t h e operator can accomplish some t h i n g else while t i t r a t i o n is going o n ; a n d operation b y unskilled or semi skilled technicians. 14 Rubber T u b i n g Expander T h e A r t h u r I I . T h o m a s Co. is offering a new device for connecting rubber t u b i n g to glass t u b i n g safely, quickly, a n d without use of a lubricant. T h e rubber tubing expander consists of three parallel tines, t h e tips of which are simultaneously diverged b y a system of levers when the handles are pressed. T h e tines are inserted into t h e end of
rubber t u b i n g which is t h e n spread open b y squeezing t h e handles. Glass t u b i n g is guided between a n d slightly beyond t h e end of t h e tines. T h e tines are unlocked b y pulling a trigger a n d can be removed without dislodging t h e glass t u b i n g b y repeating pressure on t h e handles. T h e c o m p a n y recommends t h e ex pander for use with rubber tubing from l ,U inch to 5 / 8 inch bore t h o u g h n o t for pressure or v a c u u m tubing with thick, rigid walls, or t u b i n g less elastic t h a n rubber. 15 For further information, see coupon on page 63 A
Need a flange-type resin reaction flask? Here's how to get it. . . and 6,000 other custom-made kinds of PYREX brand labware If your taste in resin reaction flasks runs to the rugged flange type, you can spare yourself the usual trials of keeping sup plied. Just open Coming's Catalog of CustomMade Laboratory Glassware (CA-2, for short) to page 56. You'll see two styles, cylindrical and spherical, both with 4 " I.D. flange openings, with finely ground faces for precision fit. Next door on page 57, you'll find facts on the Τ thermometer well—clamps, too. Makes it easy to take your choice. Once you tell us what you want, our Special Apparatus Section makes it for you—adding, if you request, extra special ideas of your own. Naturally, you get the finished work in PYREX brand glass N o . 7740, with all its properties of thermal
and chemical stability. Equally important, you get the workmanship that only these men can give. They have more experience working low expansion glasses than any one else. Send for this help ful catalog. If what you need isn't among the 6,000-plus items listed, send us a sketch and we'll make it for you.
CORNING GLASS
WORKS
69-12 Crystal Street, Corning, Ν. Υ. Corning means research in Glass
PYREX® l a b o r a t o r y w a r e . . . the tested tool of modern
research
For further information, circle number 73 A on Readers' Service Card, page 63 A
1956
73 A
