ion in which iron caz be used. strength from a given quantity of material. This bridge was patented by Rembrandt Lock- It is claimed fcr this method of construction that Patents have also been secured through the SECTION. Fic. COOMICCOn Oooo: | ‘ # 100 FECT SPAN es; 100 FECT SPAN LOCKWOOD'S… … the copper ores worked in Swansea about 70,000 tuns of sulphur, of the value of £455,000, and which might produee-no less than upwards of 210,000 tuns ot sulphuric acid, of the strength of oil of vitriol. Many of the manufactories of sulphuric acid hav begun to use the copper ore agy a source of…
Internet Archive · Public domain (published before 1931). Free to use for anything.
