Dry Air Robs Output

Ι Τ he u n . / s shown, capable o! handling up to 40,000 eu.

j ft. of space or more, list for only $100 complete w,th sensitive Fnez h u m ι d ι s t a t and all a c c e s s o r i e s . Installed as simply as unit heaters.

r * \RY au causes Fiber breakage ®-*^ in text i le m i l l s , w a r p i n g and checking of wood , shr inkage of paper , excessive static elec­tr icity, spo i lage of certain foods, c r a c k i n g o f l e a t h e r , loss ο i weight, excessive dust and many other evils that cut deep into war t ime ou tpu t .

Hundreds of lead ing plants in all types of industr ies are using Armst rong Humidi f iers t o stymie the d r y air nuisance. Ask fo r l i te ra ture on this pract ica l method of humidi f icat ion today .

WRITE TODAY for your copy of Armstrong's ne\ bulletin, ••Armstrong Humidifiers for In duitry'. It shows how plants in vu luolly every industry have salved ihei Ar>, „,r r^rr,hUm<

ARMSTRONG MACHINE WORKS Α7Π M n ^ l ^ ς*Γί*^* © Thr<=><̂ R ivers . M i c h i a a n

Accurate and dependable for routine colorimetric and jjxirbi-dimetric analysis.

An ideal instrument f o r c l in i ­cal and metallurgical w o r k and for industrial and educational laboratories.

0 Simple t o operate * Portable, Compact, Rugged β A lways Ready For Readings • Plugs into A n y 105 to 1 3 0

V o l t A . C . or D.C. Light Cir-L U M E T R O N M O D E L 400 Complete w i th 6 color filters and 1 2 matched test tubes . . .

$105

e€J0£\/itS 3 mm mît

F o r S p e e d and . â c e m ^ a e y I n Pi?©]pOTt£@imigiig M a t e r i a l s

The pressure of wart ime product ion p laces special impor tance on speed a n d accuracy . In the proport ioning of materials the Schaffer Poidometer gua rds these factors with un­varying exactness. Wi th its use no propor­tioning errors can c reep in to upset the uniformity or cause variation of the mix.

Schaffer Poidometers a re sturdily built to take the punishment of sustained high speed .

If you have a proportioning problem —raw or finished materials— write for Catalog No. 3.

SCHJIFFEE POIBOTIETEK ۩. 2828 Smallmasi St. FittshwrgH, P a .

^ ^ ^ ^ ^ ^ ^ ^ i 3 ^ ^ * ^ Processes involving use ^^^^^ 0 f Sp rays must b e given

the benefit of t he right nozzle. You can't get the results you expect b y using any handy nozzle. I t takes a nozzle built to do the work.

Spraying Systems Co. products and engineers d o just o n e job — provide the r ight nozzle for any spray­ing operat ion. It makes no difference wha t you want a spray to do, our complete line includes t h e right: nozzle. Our nozzles do better jobs for you and do them faster. And you get still more for your money when you let our engineers submit their solutions to your spraying problems.

Noiv is the time to get the information you ?ieed. Write today.

C H E M I C A L A N D E N G I N E E R I N G N E W S

SPRAYING SYSTEMS CO. 4027 W. Lake St. — Chicago, 111.

1486