The Architect & engineer of California and the Pacific Coast . segregation, thus allow-ing the concrete to be mixed wetter than would otherwise be a recent letter to -Mr. Pierre N. , ])ublicity manager of theRansome Concrete Machinery Co., Mr. M. M. ()Shaughnessy, city en-gineer of San hrancisco, under whose direction the tunnel was con-structed, wrote: I believe the conveyance of concrete by pipe is a greatachievement and the interesting part of the work is that it carries uphillon a 3 i^er cent grade better than on tiie down grade. The reason forthis is, I presume, t
The Architect & engineer of California and the Pacific Coast . segregation, thus allow-ing the concrete to be mixed wetter than would otherwise be a recent letter to -Mr. Pierre N. , ])ublicity manager of theRansome Concrete Machinery Co., Mr. M. M. ()Shaughnessy, city en-gineer of San hrancisco, under whose direction the tunnel was con-structed, wrote: I believe the conveyance of concrete by pipe is a greatachievement and the interesting part of the work is that it carries uphillon a 3 i^er cent grade better than on tiie down grade. The reason forthis is, I presume, that the material acts like a wail in a gun and is pushedforward in a mass on the uphill grade, whereas on the downhill graile it isscattered. ].xpcriment at other points in the mixing and i>lacing by the tise ofpneumatic machinery has flemonstrated the value of the use of hydratedlime beyond a doubt both as an aid in reducing friction in transit of theaggregates as well as improving the <|u;ility as to waterproofing. 70 THIi ARCIIITILCT .IXD EXGJXIIEK. IXTERIOK OF CIIVRCU ILORESCE, ITALY THE ARCHITECT AND EXGIAEER 71 San Francisco Engineer Criticises AmendedArchitects License Law MR. E. T. THURSTOX, a San Francisco constructing- engineer, andsecretary-treasurer of the San Francisco Association of Members ofthe American Society of Civil Engineers, recently addressed twocommunications to Engineering and Contracting, an Eastern technicaljournal, one of which, at least, has the ire of California is a criticism of the recent amended Architects License l-aw. whichfailed of passage during the late session of the State Legislature. communication and an outline of the proposed new law. whichproliably will come up again for passage at the next session of the Legis-lature, follows: Proposed New Architects License Law of California In view of the movement in varions parts of the country to control the practiceof strnctural engineering and arc
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