29. STANDARD DIMENSIONS OF PLUNGERS AND PLUNGER BUSHINGS. _a._ To bring all these expensive parts to the same standard of weight and bearing surface, the following dimensions are specified as the least that will be acceptable. These are based on a length of plunger which uncovers the bushings one inch at end of nominal stroke. SOLID BRONZE PLUNGERS AND BUSHINGS. ===============+==============+==========+================+=========== =Size of Pump.=| =500 gal.= |=750 gal.=| =1000 gal.= |=1500 gal.= ---------------+--------------+----------+----------------+----------- =Plunger.= | | | | Diameter |7 or 7-1/4-in.| 9-in. |10 or 10-1/4-in.| 12-in. Length | 17-in. | 17 „ | 18-in. | 24 „ Thickness of | | | | transverse | | | | partition | 5/8 „ | 5/8 „ | 3/4 „ | 3/4 „ Thickness | | | | next to | | | | partition | 1/2 „ | 1/2 „ | 5/8 „ | 3/4 „ Thickness | | | | next to end| 5/16 „ | 3/8 „ | 3/8 „ | 1/2 „ Number | | | | of ribs | 4 | 4 | 6 | 6 Thickness | | | | of ribs | 5/16 „ | 5/16 „ | 3/8 „ | 3/8 „ | | | | =Bushing.= | | | | Length | 7 „ | 7 „ | 8 „ | 10 „ Thickness | | | | at end | 5/16 „ | 3/8 „ | 3/8 „ | 1/2 „ Thence | | | | tapered | | | | evenly to | | | | a thickness| | | | next to | | | | bearing of | | | | not less | | | | than | 1/2 „ | 5/8 „ | 5/8 „ | 3/4 „ Thickness at | | | | the center| | | | bearing | | | | not less | | | | than | 3/4 „ | 3/4 „ | 3/4 „ | 13/16 „ ---------------+--------------+----------+----------------+----------- 30. WATER PISTONS AND BUSHINGS.