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Patents Show Marine Development — Latest Marine Inventions Described Specially Prepared for Marine Review By Richards and Geier Patent Attorneys, 274 Madison Avenue, New York HE object of the invention is to provide a construction for life- boats, speed boats, pleasure boats, or rafts in which buoyant members which are designed to be in the form of tubes, are effectively braced trans- versely and united by transverse as- sembling means which effectively se- cure them together; to provide a con- struction in a device of this kind in which the platform is supported from the transverse assembling members; to provide a construction in which the platform is equipped with a lon- gitudinally extending seat for the accommodation of the occupants; and to provide a construction which is generally of simple character, so as to be susceptible of cheap manufac- ture and low marketing cost.” BOAT United States patent No. 1,762,451, is- sued June 10, 1930, to Daniel F. Murphy, of Galveston, Texas. HIS invention relates to meridi- an-seeking gyroscopic compasses. The instrument is so constructed that the degrees of freedom of its gyroscopic element, about two mu- tually perpendicular supporting axes, may be suppressed in order to cause the element to follow the movement GYROSCOPE COMPASS United States patent No. 1,701,283, is- sued Feb. 5, 1929, to Harry L. Tanner, of Brooklyn, New York. 56 of the craft over the surface of the earth and maintain its normal rela- tion to this surface independently of latitude. By virtue of this construc- tion the effect upon the element of acceleration and retardation pres- sures due to changes in speed of the eraft will be automatically taken care of, and such corrections as may be necessary to meet new conditions of speed can be easily applied. HIS invention relates to electric power systems and more _ partic- ularly to systems for electric ship propulsion. An object of the invention is to provide a system of electric propul- sion which will be reliable and effi- cient in operation and which will extend the advantages of electric propulsion to low speed boats such as cargo boats and the like. ELECTRIC SHIP PROPULSION United States patent No. 1,701,350, is- sued Feb. 5, 1929, to Ernst F. W. Alex- anderson, of Schenectady, New York. HIS invention relates broadly to boat drives, and more. particu- larly to an improved mechanism for actuating the propelling means of a boat. It relates still more partic- ularly to a driving mechanism for a boat having a propeller shaft adapt- ed to be driven from more than one point, such as at or near its opposite ends, the propeller lying between the driven points on the shaft. An ex- ample of this type of drive is to be BOAT DRIVE United States patent No. 1,761,373, is- Sued June 8, 1930, to Charles H. Teg- meyer, of St. Louis, Missouri. MARINE REVIEw—September, 1930 found in the common stern wheel boat such as is used in river naviga- tion. Dae invention relates to improve- ment in indicators for wrecked submerged craft, and it consists in the combinations, constructions, and arrangements hereinafter described and claimed. An object of the invention is to provide an indicator for wrecked sub- merged crafts, such as airplanes, submarines, boats, ete., in which a novel pressure actuated release is used for freeing a buoy when the craft sinks to a predetermined depth. FLOAT United States patent No. 1,761,680, is- sued June 8, 1930, to William E. Raw- lings, of San Jose, Calif. HE present invention relates to life belts and is particularly di- rected to a life belt of special con- struction and features adapting it to fit the human body, and particularly to fit it comfortably under the arms. The principal object of the inven- tion is to provide a life belt of this character with front and rear in- flatable portions both inflatable through a single valve located in the front portion, both portions being connected by a part of the belt of decreased thickness and increased flexibility. LIFE BELT : United States patent No. 1,704,975, 18- sued March 12, 1929, to John Francis Kennedy, of Baltimore, Maryland.