Jensen and Co (Birkenhead)

1886

1886

of Abbey Street, Birkenhead

1886 Engineering provided drawings of 'a double-cylinder non-condensing screw engine constructed by Messrs. Jensen and Co., engineers, Birkenhead. In the section, Fig. 3, a a are the working cylinders with their respective pistons, b is a central chamber containing a vertical shaft d, which is driven from the main shaft by a pair of gun-metal mitre wheels with double helical teeth. The upper end of this shaft is constructed in such a manner as to receive the slide with pin e, to which both the valve rods are pivotted direct, and which works the slide valves o o in the valve chest c. The arrangement is such that the travel of the valves can be varied and the point of cut-off regulated (the lead being kept constant) by shifting the position of the pin e, this being effected by means of the bell-crank with links and the sleeve g, actuated by the spindle h and crossbar i, which latter is worked up and down by the starting wheel with screw ; it will thus be seen that the wheel above the cylinders starts, stops, reverses the engine, and gives different grades of expansion.
The engine illustrated has cylinders 6 in. in diameter and is supplied with steam by a horizontal boiler 4 ft. in diameter by 5 ft. long. It is fitted into a steam launch 45 ft. long by 9 ft. beam, built to the order of Messrs. Scott, Sinclair, and Co., African merchants, Liverpool. The boat obtained on trial a speed of 11 miles an hour, and has been at work on the Gold Coast for about twelve months. We may add that a number of engines on this system have been manufactured (including some high-pressure tandem compounds and compounds with intermediate receiver), and these are working successfully in England and abroad; we hope at a future time to give illustrations of Messrs. Jensen's compound engine.'

1886 'TRIAL TRIP.—The steam yacht Experience, built of Siemens steel to Board of Trade requirements, by Messrs. Beesley and Sons, Barrow-in-Furness, ran her trial trip recently. She is schooner-rigged, and 60 feet by 9 feet 6 inches beam, and propelled by a pair of Jensen's patent inverted direct acting compound engines, manufactured by Messrs. Jens Jensen and Co., at their works, Abbey-street, Birkenhead. The engines developed upwards of 100 horse power, driving a pair of Beesley's paddles with 12 floats at 260 revolutions per minute, and maintained a speed of about eight knots per hour. It may be stated that the boiler is of the ordinary horizontal type, and is only 4ft. 3 inches diameter by 6 feet long, but the engines proved themselves very economical in steam consumption, being fitted with Jensen's patent valve motion, working a piston valve for the high-pressure cylinder and slide valve for the low-pressure cylinder, these valves also acting in such a manner as to drain the cylinders, at each revolution, of the condensed vapour, due to the expansion of the steam. The benefit of this latter arrangement will not be doubted by marine engineers, and we are not aware that it has been attempted before in the marine engine, at least not in such a simple manner as has been worked out by the above engineering, firm.'

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