San Francisco : Architect and Engineer, Inc · leaf 159
^ NOT TOO HOT,NOT TOO COOL...but just right must be the tem-perature of the Pennvernou melt-ing tanks if the superior qualityof Pennvernou Glass is to be main-tained. This Pennvernon Craftsmanassures proper melting conditions byconstant vigilance with his pyrometer. of this interesting book. PITTS… … : sjtm &3Mm «ciQK j»JI 1^, ; * «F IHlilij • 3| IK^^^^r ffiHHI 11 Hyp ji nHi ■ ^B^iBcVB^ T HljL 1 1 f^B» ^«K; fgjM|gB
Architecture · Building
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