CHAPTER VII.

BOTTLE GLASS.

Raw materials--Furnaces--Predominance of tank furnaces-- Process of blowing bottles by hand--Gathering, marvering, blowing--Use of fire-clay and metal moulds-- Formation of neck--Improved appliances, moulds and tools--Manufacture of bottles by machinery--The “Boucher” bottle-blowing machine--Annealing of bottles-- Large bottles, carboys--Aids to the blower--Sievert’s process--Large shallow vessels, bath-tubs _p._ 95