V O L U M E 20, N O . 6, J U N E
23 A
1948
Convert an Ordinary Stopcock to a Pressure Tight Stopcock with The NEW
HAMILTON* STOPCOCK ADAPTER At last the annoyance of leaking stopcocks and the high cost of special pressure stopcocks can be elim inated by using the new Hamilton stopcock adapter. This laboratory device was designed so that it can be used with any ordinary glass stopcocks. Nothing need be done to the stopcock since the adapter fits into the groove of the standard stopcock plug. This adapter will be a boon to all laboratory workers who require pressure stopcocks, vacuum-tight stop- ' cocks, and leak-proof stopcocks for burets, gas sam pling and measuring apparatus, etc. Machined from a special aluminum alloy, these adapters will effectively resist corrosion in practi cally all laboratory atmospheres. They are excep tionally strong and rugged, with a functionally modern contour and are finished with a pleasing polish.
DETAILED DESCRIPTION The adapter consists essentially of four major parts. First, a split combination screw and bushing fits over the groove at the end of the plug of the stopcock. This bushing has an inner ridge which locks into the groove of the plug when the two sections are brought together. Second, a cup with a hole in its base fits over the combina tion screw bushing, locking the two parts of the bushing securely in the groove and at the same time pressing against the ridge of the shell of the stopcock.
Third, a spring fits over the screw and presses against the cup, insuring that the latter is tight against the shell of the stopcock. Fourth, a containing nut allows the pressure applied by the spring to be varied ; a companion lock nut fixes the chosen pressure.
G 23005 STOPCOCK ADAPTER, HAMILTON for 2 mm. Pyrex Brand Stopcocks Each T.50 G 23007 for 4 mm. Pyrex Brand Stopcocks. Each 1.50
• H a m i l t o n , I n d . Eng. Chem. A n a l . Ed. 1 9 3 6 0 ( 1 9 4 7 )
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