The New COURTAULD MODELS
have found them very useful for demonstrating carbohydrate configuration and helix configuration in polypeptide structures." u
Most importantly, however, we have been using them in connection with lectures and demonstrations of nucleotide and nucleic acid structure and chemistry . . ." —Dept. of Biochemistry (name provided on request.)
hindrance and molecular packing are there to be seen, felt, measured and remembered. You must actually manipulate a molecule, fold a chain into a complex configuration—a polypeptide for example—to really appreciate the impressive superiority of these models and the structural insights they provide. May we send you a fully detailed brochure?
It is literally true that of the many atomic models now on the market, only the Courtauld space-filling models are really suited to work in these areas. Lesser models allow no possibility of elastic distortion of valency angles or of the van der Waals envelope. Courtauld Models are light, since they are now made hollow, of highimpact polystyrene. Assembly requires no tools. The improved linkage mechanism provides options for rotation about single bor^ds and elas"We have been well pleased with the tic distortion of 0°, 6°, or variable models and they have been very useful up to 15° from normal. to us both for research and teaching Accurate bond angles, lengths, van purposes; particularly the latter. We der Waals envelope surfaces, steric
You can get the "feel" of Courtaulds with our $10 Basic Amide a-Helix Residue Kit: The 7 atoms, 10 links, 10 collars & 10 spacers; or our $5 Introductory Kit: 4 assorted atoms, 10 links, 10 collars & 2 spacers
THE
Ealing
CORPORATION
33 University Road, Cambridge 38, Massachusetts Telephone: 617—Kl Cable ; Ealing
7-5760
Circle No. 111 on Readers' Service Card
FLAMELESS BLOW TORCH
FOR QUICK HEAT up to 1,000° F. For applications requiring quick concentrated heat blast up t o 1000°F, without flame. Soften, f o r m , mold and patch plastics, etc. Temperature varied by air intake adjustment. 110-230 V. AC-DC motor 3 wire plug. All 110 V. models equipped with adapter for 2-prong receptacle. 8 f t . heavy duty cord. Intermittent duty. Other models available with lower temp, ranges. Most of the big names in indust r y use MASTER HEAT GUNS in laboratories or in production. Model HG 501-500°F. 115V—$41.25 (Others $37.25 to $62.75)
AIR HEATER BLOWER
For quick electrically heated air up to 750° F. For accelerating drying rocesses or for localized heating. Êi.T.U. 3400. Air velocity 2000 FPM. 110-230 V. AC only. 3 wire plug, all 110 V. models equipped w i t h adapter for 2-prong receptacle. 8 f t . heavy duty cord. Continuous duty 2 " dia. X 3" long discharge nozzle. Model AH 501-500° F. 115V—$55.35 (Others $52.25 t o $83.25)
Write today to Dept. 12-F Send for information on hair dryers, hand and foot massagers, vibrators, grass trimmers, hair clippers, food blenders, and air purifiers.
Master
APPLIANCE CORP., RACINE, WISCONSIN Circle No. 63 on Readers' Service Card
86 A
·
ANALYTICAL CHEMISTRY
GET MORE from STRIP CHARTS
with Rot/son Identicfatts Royson Identicharts provide remote control printing of time a n d d a t e , sequence numbers, counter r e a d ings, code symbols or other d a t a on strip charts. •
They eliminate chart watching and marking
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recorders
Write, wire or call for full details Territories still open in N e w York State and N e w England
ROYSON ENGINEERING HATBORO,
PA. OSborne
Circle No. 83 on Readers' Service Card
5-2800
