WEBER ELECTRIC

VACUUM OVENS • With automatic temperature control and pointer

scale for setting directly in degrees Centigrade

• Vacuum is held almost indefinitely

• Available for immediate shipment from our stock

WEBER ELECTRIC VACUUM OVENS. With automatic control and pointer scale for approximate setting directly at any desired temperature up to 150°C, and with cylindrical vac­uum chamber with three removable shelves.

Exterior is of Stainless steel throughout, and the vacuum chamber is of pressed steel, both copper and nickel plated,

7890 . Large Model, Double Depth, show­ing door closed and

clamp in position

7886. Small Model, showing door and clamp removed

which construction reduces the possibility of leakage some­times encountered with cast chambers. The door clamp makes it possible to use the Vacuum Oven as a low pressure oven, i.e., for internal pressures not exceeding 5 lbs. per square inch, which facilitates rapid and complete interchange of gaies.

The unique feature is the tight fit secured by means of a lead gasket on the vacuum chamber door. Seating is simply and quickly accomplished by slight rotation of the door into position, and final adjustment by tightening the screw clamp. After continued use, the gasket can be quickly replaced. The lead gasket forms such an excellent seal that a vacuum can be held almost indefinitely.

A combinea vacuum and pressure gauge, with red sector above safe working pressure, is mounted on the top of the Oven, together with two hand valves. The upper valve admits air, or any desired gas, to the vacuum chamber through a tube A which runs down the back and to the bottom of the vacuum chamber, where it terminates near the front. The lower valve connects to a larger concentric tube Β with opening in the back of the chamber below the bottom shelf. This valve is connected to the vacuum line through its intake coupling.

7886. Oven, Weber Electric Vacuum, Small Model, as above descr ibed, outside dimensions 1 8 inches high χ 1 2Vi inches wide χ 1 0 Ά inches deep, with vacuum chamber with inside dimensions 8 inches deep χ 7% inches diameter. Power consumption 5 5 0 watts. For 1 15 volts, a.c 371.50 7888 . Ditto, Large Model, outside dimensions 20 χ 1 5 % χ 12 'Λ inches deep, with vacuum chamber O I/2 inches deep χ 9'/2 inches diameter. Power consumption 800 watts. For 11 5 volts, a.c 507.00 7890 . Ditto, Large Model, Double Depth, but with vacuum chamber 19 inches deep χ 9'/2 inches diameter. Power consumption 1800 watts. For 115 volts, a.c 664.75

NOTE—Above Ovens are avai lab le for use on 2 3 0 volts, a.c. or 11 5 volts d.c. at the same prices.

SYMBOL OF QUALITY

A. H. T. CO. S P E C I F I C A T I O N LABORATORY APPARATUS '

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WEST W A S H I N G T O N S Q U A R E P H I L A D E L P H I A 5 , P A . Teletype Services: Western Union WUX and Bell System PH-72

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