journeys of which the plane was capable. Tests on the plane at Dayton with a full load of twelve passengers disclosed remarkable speed and climb. It was shown that the ship was capable of extremely high speed at high altitudes. Approximately two miles a minute with full load was maintained demonstrating the possibilities of a plane of this type for the rapid transportation of machine gunners or other troops to threatened points.

The six Martin twin-engined planes built for the Post Office Department for use in the Aerial Mail Service are similar in general design to the types built for the Army. The specifications and dimensions are in the main identical as is the performance. The planes carry six hours of fuel, a crew of two and 1500 pounds of mail, the latter divided among five compartments, four of which are fitted with trap doors operated from the pilot's seat. These doors greatly facilitate and speed up the unloading of the plane when it reaches its destination and in addition are so designed that they may be used for the purpose of dropping the mail while in flight in case the postal authorities should desire to deliver portions of their cargo by this method.

An additional feature attracting a great deal of interest is a very solidly built detachable nose so designed that in case of an accident such as might happen through a bad landing, the nose can be removed by pulling out four bolts and a new nose immediately put on. By means of this device an accident which ordinarily would hold the plane up for two weeks or more can now be repaired in a few minutes. These planes are used in the New York to Chicago service making only one stop en route at Cleveland.

The latest development of the Martin twin-engined airplane is found in the navy order, which is now well under way. Changes and improvements, in keeping with the Martin policy of progress have been made which make certain even better performances than those which have been made by the earlier twin motored planes. Designed to carry a full sized navy torpedo weighing over a ton these planes can be operated as an aerial coast patrol from landing fields along our shores or can be taken out to sea on warships or sea sleds and there used as an active adjunct of the fleet.

Just as the eight years of experience in designing and building aircraft prior to 1917 assisted materially in enabling the Glenn L. Martin Company to produce the Martin Bomber, so the two years of experiment and construction on the Martin Bomber have enabled

The Glenn L. Martin Mail Plane, First of the Post Office's fleet for New York-Chicago service.

the Glenn L. Martin organization to produce commercial aircraft of a superior quality. With an eye to the future, the Glenn L. Martin Company during the war designed a type of airplane whose general characteristics and qualities were similar to those demanded of a commercial airplane. The combination of safety, speed, steadiness, strength and controllability so necessary in the corps d'armée and bombing type of military planes formed exactly the same combination of qualities called for in the airplane of commerce so that the experience gained during the war served to develop the Martin Commercial Airplane. In other words the Martin passenger, freight and mail carrying airplane is not in any sense of the word an experiment but is a pedigreed product with actual performance to its credit.

Long cross-country trips by Martin Bombers and Martin mail planes have definitely established the ability of this type of plane to link the important centers of the United States by aerial transportation. Martin twin-engined airplanes have flown over long distances carrying as many as twelve passengers and as much as a ton of dead weight. The ton mile efficiency of the Martin twin-engined airplane is an established fact while the ability of the plane to fly with a full load on a single motor reduced to a minimum the danger which accompanies forced landings.

No airplane has ever approached the service record of Martin Bomber No. 2 which, with 10,000 miles of cross-country flying to its credit was started off on a pioneering trip around the rim of the United States in command of Col. R. S. Hartz. On Sunday, November 9th, Col. Hartz completed his journey, having covered 9823 miles in 114 hours 25 minutes. This included 100 separate flights and the crossing of the Rockies at an altitude of 13,000 feet. The average speed was 94 miles per hour. The gasoline consumption was less than 46 gallons to the hour. The plane landed in Washington with a total of 225 hours and 24 minutes of actual flying or practically 20,000 miles and still retained its original fabric. It was in perfect alignment and in condition to continue, if necessary, with but slight repairs. So remarkable was the demonstration of the fine construction of this plane that the Smithsonian Institution has asked to have the plane turned over to it that it may be preserved for future generations.

The Glenn L. Martin Company as an organization has been in existence for a long time as time is reckoned in aviation. The first

relationship between Mr. Martin and the United States Army came in June, 1913, when the first plane was made and delivered from the Los Angeles plant. The following year found increased orders and Mr. Martin delivered military planes to both the Holland Government and the Netherlands East India Government. The first Martin plane for the United States Army proved a success and the relationship between the Martin organization and the Army has continued.

Mr. Martin is a pioneer flyer, having built his first airplane in 1908 and taught himself to fly. Every year saw a new model, with marked improvements, and with which Mr. Martin traveled thousands of miles the beginning of the development and establishment of an individual group who have widened and improved the types to a great degree.

Mr. Martin began, as early as 1912, to surround himself with men of marked ability in their various specialized positions in his company, and have cooperated to carry out his ideas for superior aircraft and the highest possible development of the art.

Two men in particular whose development and advancement has been very rapid, are Lawrence D. Bell, Factory Manager, whose unquestioned ability as a producer is a valuable asset to the organization. He has been with the organization since 1912.

Mr. Martin has great confidence in the unusual qualities of Donald W. Douglas, his Chief Engineer, who is nationally known for his ability. Mr. Douglas came directly to the organization from the Massachusetts Institute of Technology in 1915.

Eric Springer, Chief Pilot, is known nationally because of his wonderful successes in test flying and cross-country work with Martin airplanes. He graduated from the Martin school in 1915 and has been connected with the Martin forces ever since.

The harmony of the entire organization and its loyalty to the policies of the company is a very notable feature, which together with the skill and ability of the entire personnel, has made a very efficient aircraft factory.

PACKARD MOTOR CAR COMPANY
DETROIT, MICH.

President and General Manager

Vice-President of Engineering.

Vice-President of Manufacturing
Vice-President of Distribution.
Secretary and Treasurer

ALVAN MACAULEY

J. G. VINCENT

F. F. BEALL
H. H. HILLS

F. L. JANDRON

SINCE the war period, the principal aviation work of the Packard Motor Car Company has been the development of motors and planes by their experimental department. New engines and planes of the highest efficiency have gone through very satisfactory tests. With the exception of the Packard aviation engine, Model I.-A.-1650, none of their air products will be put on the market for the present Packard engine Model I.-A.-1650 has specifications practically identical with the famous Liberty, in the development of which this company played such an important part. Manufacturers and those requiring highpowered motors are invited to direct their inquiries to the Aviation Department, Packard Motor Car Company, Detroit, Michigan.