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If it's Iron or Steel- HOT GALVANIZE IT
                the
         ...NATIONAL WAY...

The very life of more and more metal products totay depends on a simple inexpensive coating -- Hot Dip Galvanizing -- the modern, most durable and most economical armor against corrosion's costly bite. You use iron and steel for strength -- then assure its future sales and service by galvanizing -- Hot Dip Galvanizing the National way -- that's the coating that conquers depreciation.

For depth of coating and evenness of distribution, you can't surpass National Hot Dip Galvanizing. Many a fine product. Perfect in itself, has failed in competition because it entered the sales lists unguarded against corrosion. Don't take chances. Specify NATIONAL HOT-DIP GALVANIZING on all your jobs. 

[INSIGNIA OF COMPANY IN THE CENTER OF THE PAGE -- drawing of a mechanic standing on a checkered obelisk holding a circle with each hand. In the circle of his right hand is the company insignia. The profile of a Roman soldier holding a sword and shield with the words "OFFICIAL INSIGNIA" bordering the top of the circle and "PROTECTED BY GENUINE HOT DIP GALVANIZING" under the profile of the soldier. In his left hand is a circle with a drawing of the D.C. Capitol building]

NATIONAL LINE MATERIALS

Make Easy Construction and Maintenance Work on the Wire Highways .....

National Line Materials are designed to facilitate the construction and maintenance work on the overhead or underground lines of telephone, telegraph, electric light, power and railway companies.

Each National product is made to meet and solve some particular line problem efficiently and economically. National Line Material include:--Nicopress Splicing Sleeves and Tools--Double and Single Tube Splicing Sleeves--Split-Tinned Copper Connectors--tinned Copper Cable Sleeves--Cable Rings, Regular and Extra Long--Zinc Cable Clips--Marline Cable Hangers--Ring Saddles--Bridle Rings--Drive Rings--Angle Screws--New York Ground Clamps and many specialties. 

          THE NATIONAL TELEPHONE SUPPLY COMPANY 
        5100 SUPERIOR AVENUE ..... Cleveland, Ohio 

[PHOTOGRAPH] 
[CAPTION UNDER PHOTOGRAPH] Jacobs Engines have led the 200-400 H.P. field in new registrations (commercial and private) for the past three years, and their lead is steadily increasing.
[CAPTION NEXT TO PHOTOGRAPH]
Rated 300 H.P. at 3700 feet altitude "330 H.P. at 26" H.G. Manifold Pressure for Take-Off 

JACOBS AIRCRAFT ENGINE COMPANY

POTTSTOWN   [INSIGNIA OF COMPANY READS    PENNSYLVANIA 
             JACOBS AIRCRAFT ENGINEERS
             EFFICIENT RELIABLE
             EST. 1927]

PAGE 50                          OFFICIAL DIRECTORY & LOG