Chapter LXXV: Section 86: Tanks and Cisterns

=1560. Plan of square tank= of ordinary form; formed of cast iron flanged plates and wrought iron tie rods, the joints are either made with rust cement or planed and jointed with tape and red lead.

=1561. Plan of square tank= with rounded angles.

=1562. Circular tank.= No tie rods required.

=1563. Elliptical tank.= Requires tie rods across the flat sides.

=1564. Polygonal tank.= No tie rods required.

=1565. Elevation of square or polygonal tank.=

=1566. Elevation of cylindrical or circular tank.=

=1567 & 1568. Condensing or cooling tanks.= Surface condensers with sloping trays or tubes.

=1569. Wrought iron tank,= usual section, formed of sheets and ~L~ irons riveted together.

=1570 & 1571. Circulating or depositing tanks.=

=1572. Boiler saddle tank.=

=1573. Circulating tank= for hot water.

The level of water may be maintained in tanks by either an overflow
pipe or notch, or by a ball cock on the supply pipe. Glass water
gauges can be fixed outside to show the level of the water inside; and
floats are used, attached to a cord and pulleys, for the same purpose.
See also No. 1730.

Section 87.--THROWING IN AND OUT OF GEAR.

=1574. The driving wheel= is loose on shaft, and is locked to its shaft by the hand wheel nut (see No. 945), or by a ratchet wheel and locking pawl.

=1575. Two half-nuts= are lifted in or out of gear with the screw by cam or lever motion. See No. 942.

=1576. One shaft runs in eccentric bearings,= which can be revolved so as to throw it out of gear with the other shaft.

=1577. Radius bar and slot.= The stud wheel can be shifted in or out of gear along the slot.

=1578. Sliding back shaft,= slides out of gear. See dotted lines.

=1579. Method of throwing a pulley out of gear= by slacking the belt. This is done either by a cam bearing or sliding motion to the driver shaft. Works best vertically. See also No. 1219.

=1580. Cam slot motion= for back shaft. To throw it in or out of gear.

=1581. Motion employed for punching machines,= &c. To set the punch in or out of action by a cam and hand lever.