Iron deficiency symptoms in grapevine as affected by the iron oxide and carbonate contents of model substrates

The preparation and properties of pure i

The preparation and properties of pure iron alloys: II. Magnetic properties of iron-carbon alloys as affected by heat treatment and carbon content

✍ W.L. Cheney. 📂 Article 📅 1923 🏛 Elsevier Science 🌐 English ⚖ 151 KB

Feb., t923.] U.S. BUREAU OF STaXDaRDS NOTI.ZS. ## 253 and to formulate a statement of the conditions under which the spherical aberrations of two thin lenses will compensate one another. This last is confined to the simplest case, in which the lenses are close together. The treatment is in part a