20A A N A L Y T I C A L C H E M I S T R Y

A.H.T. CO. SPECIFICATION

S T O P C O C K T E N S I O N C L I P S Λ

y m ι=Α

3S91-B. Method of attachment or removal.

• Consisting of two similar pieces of formed Stainless steel with circular openings for insertion of the smaller end of stopcock plug, joined at one end by a spring-loaded pivot so that, in use, the openings are superim­posed only when thumb and finger pressure is exerted on the sides. A tapered compression spring of Stain­less steel, attached at one corner, provides the necessary continuous pressure against the end of the stop­cock shell when Clip is in position. The edges of the openings converge and fit tightly into the stopcock groove when the spring is pressed against the end of the stopcock shell and finger pressure is released.

For INSTANT attachment to, or removal from, practically any stopcock with plug furnished with groove for rubber washer

• STOPCOCK TENSION CLIPS, A.H.T. Co. Specification (Patent Applied For). Of Stainless steel, for pressure-tight seating of practically any type stopcock with groove for rubber washer at small end of plug. Can be attached instantly by compression of the spring and with thumb and finger pressure on the narrow flanged sides. Can­not work loose, but can be removed instantly. Recommended for glassware which requires hand or mechanical shaking such as Van Slyke Appara­tus, Separatory Funnels, etc., and to improve the efficiency of stopcocks on Burettes, Gas Analysis Apparatus, Sampling Tubes, etc.

• The increased space required for attachment on most glassware is negligible, as the Clip does not extend beyond the end of the plug and does not interfere with smooth, normal manipulation of the stopcock handle. Overall width is held to a minimum; for example, the width of Clip with 11 mm jaw diameter is, in use. only 28 mm.

r 3291-B. Stopcock Tension Clips, as Maximum jaw diameter, mm.. 1 1 Fits stopcock No 1, 1 Vi, 2 Each

above described. 16 19

3, 4 5, 6

"Λ

1.00 Î . 1 0

1 0 % discount !n carton containing 1 2 2 0 % discount in lots of 144

1.25

3291-B. In position on stopcock plug of d Burette.

3291-B. Rear view of Stopcock Tension Clip showing spring opposed jaws.

3291 -B. Side view of Stopcock

Tension Clip.

Fig. 1 . Showing correct type of stopcock for satisfactory use with Clip, i.e. with right-angled groove and with dis­tance A—Β of '/s-inch or more.

Fig. 2 . Showing unsatisfactory type of stopcock for use with Clip, i.e. with groove too close to shell and with shallow, rounded groove which tends to eject the spring.

ARTHUR H. THOMAS COMPANY

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA.

Teletype Services: Western Union W U X and Bell System Ρ Η-72

J Laboratory Apparatus and Reagents