Hook, glass

Common supports include glass or ceramic rods or hooks, glass cradles, fluorocarbon plastic thread or string, and various insulated or coated metallic supports. 

Fig. II, 55, 3 depicts a ground joint with glass hooks, to which light springs may be attached. Figs. II, 55, 4 and II, 55, 5 are drip cones for condensers and the like the latter is generally employed for joints larger than 29 mm. in diameter, the orifice being reduced to about 18 mm. Fig. II, 55, 6 is a double-cone joint in which two cones, e.g., B19 and 524, are made like a single joint this is valuable as it saves the use of an adapter.

Receiver adapters or connectors. Various forms of receiver adapters are shown in Figs. 11, 56, 26-29. The simplest form. Fig. 11, 56, 26, carries a glass hook for securing it to the condenser by means of a rubber band from the side tube to the hook an improved form, incorporating two ground glass joints is shown in Fig. 11, 56, 27. A useful adapter is illustrated in Fig. 11, 56, 28 when employed at atmospheric pressure, a drying tube may be attached to the side tube, if desired in a distillation under reduced pressure, the side tube is connected to the pump. Fig. 11, 56, 29 depicts a receiver adapter with an additional socket connection. 

No material is perfectly elastic in the sense of strictly obeying Hooke s law. Polymers, particularly when above their glass transition temperature, are certainly not. For these macromolecular materials there is an element of flow in their response to an applied stress, and the extent of this flow varies with time. Such behaviour, which may be considered to be a hybrid of perfectly elastic response and truly viscous flow, is known as viscoelasticity. 

A second device for reproducible chamber saturation is the Alltech Latch-Lid eqnilibration apparatns. The modihed lid has two retractable glass hooks passing throngh Teflon-threaded collars, which are used to raise and lower the rack inside the closed chamber. Thus, the plate placed in the rack can be conditioned and thereafter lowered into the mobile phase. 

When all the iodine has sublimed out of tube C (10 to 12 hours), nitrogen is admitted into the system, and the apparatus is allowed to cool to room temperature. Tube C is removed, and the glass-wool plugs and unreacted titanium (0.23 g.) are removed with a hooked copper wire while purging with nitrogen. Caution. Care should be exercised in removing the unreacted titanium from the tube the titanium may be pyrophoric. Then tube C is cleaned, dried, and reattached to tube B. Tube B is removed from attachment to A and, while holding tube B... 

With slide clip in open position, the labeled glass slide and the sample chamber are fit against the slide clip. The spring clip is brought up and secured under the two retaining hooks. 

The reaction manifold describing the automated determination of ammonia is shown in Fig. 6.1. Two alternative modes of sampling are shown discrete and continuous. Discrete 5 ml samples contained in ashed (450 °C) glass vials are sampled from an autosampler (Hook and Tucker model A40-11 1.5 min sam-ple/wash). For high-resolution work in the estuary, the continuous sampling mode is preferred. The indophenol blue complex was measured at 630 nm with a colorimeter and the absorbance recorded on a chart recorder. 

A general procedure for determining the effects of immersion in liquid chemicals is given in ISO 175. This covers exposure in the unstrained condition. The test pieces are immersed in the liquid held in (usually) a glass container. The volume of liquid should be at least 8 ml per square centimetre of test piece surface. The test pieces should be completely immersed and with all surfaces freely exposed, for example, by hanging on hooks. 

Figure 1. Sketch of the hydrostatic balance densitometer— A) magnetic stirrer (B) glass float (C) stirring motor (D) constant temperature bath (E) nickel thermometer (F) lucite plug (G) sample container (H) nylon wire (1) suspension hook (]) Mettler H20 balance (33)...

Figure 4.19 — (A) Detail of a wall-jet cell in (Al) top view and (A2) side view (1,2) Perspex blocks (3) contact wire (hook) (4) CHEMFET (5) glass (6) ring (7) PTFE tubing. (B) Side view of the flow-through cell (1,2) Perspex blocks (3) contact wire (4) CHEMFET. (Reproduced from [151] with permission of Elsevier Science Publishers).

Helical spring balances first used by McBain and Bakr have been extensively used for adsorption measurements. The spring is suspended inside a glass tube by attachment to a hook at the top. A bucket containing the adsorbent is connected to the bottom of the spring. The bottom of the tube, containing the sample, is immersed in the coolant. The upper portion of the tube is connected to a vacuum pump, source of adsorbate, and manometer. 

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