MERCURY COLUMN The tube in this Mercury Column is not made of glass,but is made of a transparent compound which may be bentbut will not break. The mercury cannot be lost. The air passages are largeand cannot be clogged. It is so constructed that ether can-not get into the mercury chamber. The spud… … GAS PROVING PUMP No. 2155, Gas Proving Pump Etch $9.00 48 BUTTERWORTH SUPPLY CO., PHILADELPHIA, PA. WROUGHT STEEL LADLES TWO LIPS
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