Today on Weekly Boiler Tips we dive into the math behind pounds-per-square-inch—and why diameter drops out of the equation. Confused why a 4 in. pipe and 3/8 in. tube both show the same ...

Which? Limited is registered in England and Wales to 2 Marylebone Road, London NW1 4DF, company number 00677665 and is an Introducer Appointed Representative (FRN 610689) of the following: 1.

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...