National boilers, radiators, and specialties: catalog no26 . thewater type. National Indirect radiator sections are assembled™Lhl Nfatlonal Push nipples of heavy resilientaTsSdytignr011- ^ ** ^ WiU remain Width each section occupies in stack 3U inchesor when speaally ordered, to give additional air areathis can be increased to 4 inches or 4^ inches by usingextra long nipples. y & Tappings • ul1!,0^648 f?r, feed and return are tapped 2 inchesright-hand and bushed to size, according to regulartapping hst for National Premo radiators If locationof tapping is desired other than regular soecial tar
National boilers, radiators, and specialties: catalog no26 . thewater type. National Indirect radiator sections are assembled™Lhl Nfatlonal Push nipples of heavy resilientaTsSdytignr011- ^ ** ^ WiU remain Width each section occupies in stack 3U inchesor when speaally ordered, to give additional air areathis can be increased to 4 inches or 4^ inches by usingextra long nipples. y & Tappings • ul1!,0^648 f?r, feed and return are tapped 2 inchesright-hand and bushed to size, according to regulartapping hst for National Premo radiators If locationof tapping is desired other than regular soecial tar, Assembling th^1?, SUre1that *he Otters or marks designating SS&SS^Tface the same way- This insuref For convenience in handling, indirects are shippedloose, unless expressly ordered to be built into stackswhen a charge of one cent per foot is made tocover^•f assembhng- Customers should be careful toa?rlyh 6Knrber £ Stacks int0 which the sectionsbe sapped S° neC6SSary V6nt SeCtions ma^ 55 NATIONAL RADIATOR NIPPLES NATIONAL J If Push Nipple. A Push Steel Nipple in Use LessThan Four Years PROBABLY no other feature ofcast-iron radiator constructionhas been so widely discussed-—nor as much misrepresented—as theradiator nipple and the propermethod of making a permanent tightjoint between the sections. Up to 1905 fully 90 per cent of allradiators manufactured were assem-bled with push nipples of thin effect of corrosion in some local-ities limited the life of the steel pushnipples to less than four years. When the disadvantages of steelnipples became apparent the malle-able cast-iron nipple was the object ofexperiment. It was found that thismetal was practically like that of theradiator and its life would thereforebe as long as that of the radiator. Itsresiliency was a commendable feature. Due in great measure to the fact that malleable castings could not bemade satisfactory at the time or that they ^^^J £gSof perfection necessary to make an absolutely tight Jo
Size: 1661px × 1505px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectsteambo, bookyear1920
