_a._ Valve Rods for their entire length must be of solid Tobin Bronze,
with sizes not less than in table below.
=========+==========+===========+============+============
=Size of=| | | |
=Pump.= |=500 gal.=|=750 gal.= |=1,000 gal.=|=1,500 gal.=
---------+----------+-----------+------------+------------
Diameter | | | |
of rod | 1 inch. |1-1/8 inch.| 1-1/8 inch.| 1-1/4 inch.
---------+----------+-----------+------------+------------
_b._ The net area of valve-rod at its smallest section subject to
tensile stress, must not be smaller than at bottom of U. S. standard
screw thread on rod of diameter given above.
The construction of this rod as affecting lost motion at slide valve
is specified under Article 15.