16 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

NEW TYPE PINCH CLAMPS For quick, convenient and safe mounting and dismantling of apparatus with spherical

interchangeable ground glass joints.

INCLUDING TWO NEW LARGE SIZES FOR SPHERICAL JOINTS

NO. 75/50 AND 102/75

3241. Fig. 1, showing appearance of Sizes 12 and 18. Joint held

securely by spring.

3241. Fig. 2, showing method of attaching to joint. Parte held securely by spring upon release of finger pressure.

SCRE.W LOCKING DEVICX

3241. Fig. 3, showing appearance of Sizes 28 to 75, inch, with locking device

screwed into position.

PINCH CLAMPS, A.H.T. Co. Specification (Patented), for use on spherical ball-and-socket glass joints. Of brass, with smooth, black, corro­sion-resistant finish, and with strong, spring closed, forked jaws. With the two parts of the glass joint held in one hand, and the Clamp held between thumb and forefinger of the other hand, as shown in Fig. 2, the Clamp can be quickly slipped over the joint. When pressure is released, the two parts are held securely by the spring.

Sizes 28 to 75, inclusive, are provided with a screw locking device, as shown in Fig. 3, in addition to the spiral spring. Size 102 has a flat hinge and spiral spring between the upper and lower jaws, which permit adjustment of the clamp over the joint with one hand. Two slotted posts, each fitted with hinged screw and knurled head nut, are provided at the mouth of the forked jaws to lock the clamp securely in position. A considerable load can be suspended from the joint without danger of leakage. However, the Clamps are designed pri­marily for securing the joint and are not intended to replace the usual clamps, rings, tripods, etc., as ordinarily used for supporting glassware assemblies.

The use of these Clamps adds greatly to the convenience and speed of mounting and dismantling glass apparatus with spherical interchangeable ground joints, arid reduces the possibility of breakage in handling.

3241, Fig. 4 Showing appearance of Size 102 and method of fasten­

ing in position.

3241. Pinch Clamps, A.H.T. Co. Specification, as above described. The size number indicates the diameter in milli­meters of the ball over which the Clamp fits. Size number Takes spherical joint No . . . .

Minimum width of fork opening in jaw, mm

12 12/1

to 12/5, incl.

10

18 18/7 and 18/9

13

28 28/11

to 28/15,

incl.

21

35 35/20 and

35/25

30

50 50/30

37

65 65/40

48

75 75/50

58

102 102/75

82 Each CodeWord

.65 Cybld

η carton ' lots of ί it il

.75 Cybny

containing 12 72

U4

1.40 1.80 Cybow Cybpu

> singly or assorted

2.90 Cybso

in carton

3.60 Cybvi

units

5.50 Cybwj

11.00 Cybxe

10%} discount t 15% " 20%

.65 Cybld

η carton ' lots of ί it il

.75 Cybny

containing 12 72

U4

1.40 1.80 Cybow Cybpu

> singly or assorted

2.90 Cybso

in carton

3.60 Cybvi

units

5.50 Cybwj

ARTHUR H. THOMAS COMPANY RETAIL—WHOLESALE— EXPORT

LABORATORY APPARATUS AND REAGENTS WEST WASHINGTON SQUARE, PHILADELPHIA 5, PA., U.S.A.

Cable Address "Balance" Philadelphia