The Artizan . but that of the static pressure of the water behind them ;and as the intensity of that pressure is known the gates may be readilyconstructed of just sufficient strength for that purpose—that is to say, theymay be made as light as possible; but in the case of a port lying closeupon the sea, like that of Liverpool, whose waters therefore are, subject tothose violent disturbances which invariably accompany heavy storms, thedock gates have to resist the shocks of waves whose iutensity it is abso-lutely impossible to estimate beforehand. Here, therefore, they mustbe made as massive as
The Artizan . but that of the static pressure of the water behind them ;and as the intensity of that pressure is known the gates may be readilyconstructed of just sufficient strength for that purpose—that is to say, theymay be made as light as possible; but in the case of a port lying closeupon the sea, like that of Liverpool, whose waters therefore are, subject tothose violent disturbances which invariably accompany heavy storms, thedock gates have to resist the shocks of waves whose iutensity it is abso-lutely impossible to estimate beforehand. Here, therefore, they mustbe made as massive as may consistently be done without increasingto an unpractical extent, the labour of opening or closing them, and undersuch circumstances it is desirable to employ a material that offers thegreatest possible amount of strength combined with the least possibleweight or specific gravity. Now it is a well known fact that those kindsof wood which are generally used for building purposes, when similarly Place. 233. I THE ARTIZAN. AUC Ist 18 65. Plate. Z83 Fl C. I . T OT^iCES lEiSEY E)©GI
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
