液位计用管状玻璃、保护玻璃、透视玻璃和反射玻璃、圆形观察玻璃和轻型玻璃以及高压蒸汽锅炉用孔口玻璃的标准尺寸、材料和质量。还包括热冲击试验方法和要求。交叉引用:BS 759BS 3447工厂法，1961年

Standard dimensions, material and quality of glass for tubular, protector, through-vision and reflex glasses for level gauges, for circular sight and light glasses and for port gauge glasses for high pressure steam boilers. Also thermal shock test methods and requirements.Cross References:BS 759BS 3447Factories Act, 1961