20 A 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 (PATENT APPLIED FOR)

For instant attachment to, or removal from, practically any stopcock plug with groove for rubber washer by compression of the spring and pressure of the thumb and finger on narrow flanged sides of the Clip

A.H.TCO.

3291-B.

Fig. 1. Side view.

3291-B. Fig. 2. Rear view, showing spring op­posed jaws. 3291-B.

Fig. 3. Showing method of attachment or removal,

U 3291-B.

Fig. 4. In position.

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. Can not work loese, but can be removed instantly. Recommended for glassware which requires hand or mechanical shaking such as Van Slyke Apparatus, Separa-tory Funnels, etc., and to improve the efficiency of stop­cocks on Burettes, Gas Analysis Apparatus, Sampling Tubes, etc.

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.

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.

3291-B. Stopcock Tension Clips, A.H.T. Co. Specification, (Patent Applied For). Of Stainless steel, as above described, for attachment to stopcocks with groove for rubber washer. Distal edge of the groove in plug must be at least Vie-inch beyond the stopcock shell for satisfactory attachment. Maximum jaw diameter, mm 11 16 19 Fits Τ stopcock with straight bore, No^ 1, V/i, 2 3, 4 5, 6 Each 1.00 1.10 1.25

10% discount in carton containing 12; 15% discount in lots oj'72) · d { . 20% discount m lots of 144 ι

ARTHUR H. THOMAS COMPANY LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA.

Teletype Services: Western Union WUX and Bell System PH-72 Telephones : Philadelphia, MArket 7-5600—New York (private line) REctor 2-5035—Washington, JUniper 7-5867

Baltimore, Enterprise 5600—Boston, Enterprise 2100