MANKER-HEAVNER NAVIGATION Stock 1907 Inventor Carey A. Manker Marine Propulsion

Description

The Manker-Heavner Navigation Company. Stock issued January 30, 1907 at Chicago, Illinois. Incorporated in 1903 in the Territory of Arizona
. Certificate
No. 1170
was issued to Laura G. Marshall for 50 shares of capital stock ( per share). Company capital was
,000,000
. Hand signed by company
president C. A. (Carey Alan) Manker
and assistant secretary. Certificate is about 5.5” x 10.” Black print with gold underprint.
The Manker-Heavner Navigation Company was formed in 1903 by Carey Alan Manker of Pearl, Illinois to develop his inventions related to improved propulsion systems for marine vessels. Manker held several patents in the early 1900s, one of which describes his invention: “… a means of securing a diminution of resistance while the vessel is being propelled forward, an improved propeller being employed as part of such means by which a lifting action, lost in the common screw-propeller, is secured and utilized to reduce displacement while the vessel is in motion.
A
further object is to provide means for adjusting the propeller mechanism to drive the vessel at different speeds and reverse the course of the vessel and means for maintaining a proper degree of stability of the vessel, as well as other features whereby displacement is materially reduced or practically eliminated and greater speed allowed.
”
Condition:  Very Fine++
, light folds, minor creasing, no tears, light signs of wear/handling/toning (see photos),
uncancelled.
Printer:
Goes.
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