Boiler | Receiver | |Revolutions | | |Second Pressure.| Pressure.| Vacuum. | per Minute.| Speed.| Means.| Means. -------------+----------+---------+------------+-------+-------+------ |lb. | lb. | in. | | | | 1 | 130 | 32 | 28 | 373 | 22.641| | | | | | | | 24.956| 2 | 130 | 32 | 28 | 372.7 | 27.272| | 24.992 | | | | | | 25.028| 3 | 130 | 32 | 28 | 372 | 22.784| | 25.028 | | | | | | 25.028| 4 | 130 | 32 | 28 | 377 | 27.272| | 25.138 | | | | | | 25.248| 5 | 130 | 32 | 28 | 375 | 23.225| | 25.248 | | | | | | 25.248| 6 | 130 | 32 | 28 | 377 | 27.272| | +------+----------+---------+------------+-------+-------+------- Means.| 130 | 32 | 28 | 274½ | | | 25.101 | | | | | | knots -------------+----------+---------+------------+-------+-------+------- --_Engineering_. * * * * * SOME RECENT HIGH-SPEED TWIN SCREWS. [Footnote: A paper recently read before the Institution of Naval Architects, London.] By E.A. LINNINGTON. One of the most interesting and valuable features in the development of naval construction in recent years is the great advance which has been made in the speeds of our war ships. This advance has been general, and not confined to any particular vessel or class of vessel. From the first class armored fighting ship of about 10,000 tons displacement down to the comparatively diminutive cruiser of 1,500 tons, the very desirable quality of a high speed has been provided.