Flash Boilers Or " Proportionate " Generators.

By D. H. Simpson. In my last article (page 295 ante) I endeavoured to explain some of the peculiar features of the flash boiler; these may be summarised under three headings :......

Useful Charts And Tables. No. 2.

By George Watson, A.M.I.Mech.E. Helical Springs or Motor Vehicles. Helical compression, or tension, springs are used for so many purposes on motor vehicles, and the formula for......