Mechanical Contracting & Plumbing January-December 1908 . Fig. 6—Vacuum Pump Connections and Details. of larger capacity. The No. 2 Toledoand the No. 20 Jardine, having a ca-pacity from 2| to 4-inch inclusive, onlyweigh 60 pounds complete. The No. 3Toledo, having a capacity 4^ to 8 , only weighs 190 pounds. Whencompared with the weights of machinesof other makes, this advantage in port-ability will be immediately 7—Positive Differential Valve. The Jardine No. II, taking from 1-inchto 2-inch inclusive, is supplied with left-hand dies, while the Toledo tools arefor rig
Mechanical Contracting & Plumbing January-December 1908 . Fig. 6—Vacuum Pump Connections and Details. of larger capacity. The No. 2 Toledoand the No. 20 Jardine, having a ca-pacity from 2| to 4-inch inclusive, onlyweigh 60 pounds complete. The No. 3Toledo, having a capacity 4^ to 8 , only weighs 190 pounds. Whencompared with the weights of machinesof other makes, this advantage in port-ability will be immediately 7—Positive Differential Valve. The Jardine No. II, taking from 1-inchto 2-inch inclusive, is supplied with left-hand dies, while the Toledo tools arefor right-hand construction entirely. The principle of die expansion whilecutting the thread is a new one. The
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