Abstract: This invention relates to a modular mechanism and methods for synchronizing the speed of one engine with a reference speed such as another engine particularly as found in boats. A physically limited range of fine tuning is combined with the normal operation of existing manual control over its full range of course adjustment, without interference, by way of an adjustable link coupled non-resiliently in series with the throttle linkage and allowed to slide along a non-circular shaft or key that causes micrometer adjustments in length of the link between the manual control and the throttle when the key is turned. The key can be turned by a differential device or reversible motor responding to continuous or interruptable power related to the engine speeds.

Abstract: Apparatus for testing the bond strength of materials comprising a housing having a cavity, an extrudable fluid seal received in the cavity, and a passage for placing the fluid seal in communication with a source of pressurized fluid. A material is attached to a fastener associated with the housing, coaxial with the housing's longitudinal axis. The fastener, the material being tested, and the extrusion boundary of the fluid seal are independent of the pressurized fluid applied to the fluid seal.