. The Architect & engineer of California and the Pacific Coast . REAR WALL OF HALE DEPARTMENT STORE. SAN FRANCISCO,terproofed with the aid of the Cement Gun. Part of the west wall of this huildii being similarly treated several yea ago and it teas the only dry sf>ot during the recent heavy. ANOTHER PICTURE OF irATERPEOOFlXG PROCESS LXDER HAYHALE STORE. SAN FRANCISCOReid Bros., Architects The .lichilcct and Eniimccr 91 between the two. Tliiis it apiJcars that the ;;uii autiimaticall}- pnixiilesan ideal btmd tVir all the mortar it a|)plies. An ideal mortar mix requires that each
. The Architect & engineer of California and the Pacific Coast . REAR WALL OF HALE DEPARTMENT STORE. SAN FRANCISCO,terproofed with the aid of the Cement Gun. Part of the west wall of this huildii being similarly treated several yea ago and it teas the only dry sf>ot during the recent heavy. ANOTHER PICTURE OF irATERPEOOFlXG PROCESS LXDER HAYHALE STORE. SAN FRANCISCOReid Bros., Architects The .lichilcct and Eniimccr 91 between the two. Tliiis it apiJcars that the ;;uii autiimaticall}- pnixiilesan ideal btmd tVir all the mortar it a|)plies. An ideal mortar mix requires that each particle of sand he envelopedin a tilm of cement. The gun, as shown above, first applies neat cement,thick enougfh to imbed the sand t;;;rains. On this, in turn, a layer ofcement is built up until it is thick enough to imbed a new layer of no time can this process be changed, because sand striking sand re-bounds. It must not be supposed that these operations are distinct, aseach layer is applied in a small fraction of a second. Tlie wii<ile i)rocessis rapid and continuous. Authorities agree that the leaner the mixture, the less it contracts uponsetting and the less it is aifected by temperature changes. We can takeadvantage of this with the gun, because a 1 mortar, g
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