Free Surface or a Wall 



The following cases may be listed: rise of the free surface over a laminar riffle, 

 Cisotti;^^^ change in trend of the wall, Boggio;^°^ deadwater in an angle, Agostinelli;^°^ 

 source against a wall, Masotti.'^" 



Gliding of a plate on a free surface is treated by Green^°^ and in Milne-Thomson's 

 book (Reference 2, Section 12.3); of a slightly curved plate, by Franke,^^° 



A jet of finite width striking a cylinder of the following shape has been studied: a 

 plate, with a wake behind it, by Morton and Harvey, ^^^ Tomotika,^^^ Cisotti,^^^ Havelock,^^ 

 Stokalo,^"*^ or without a wake, by Tomotika;^^^ a circular arc without a wake, or a circular 

 cylinder, by Jacob. ^^"^ The jet may issue from a two-dimensional orifice and hit an obstacle; 

 see Valcovici,'^^^ Tumlirz,^^^ and Hartmann.^^^ A cylinder may have both a wake behind it 

 and a deadwater in front; see Agostinelli. ° 



Jets or currents of fluid bounded by free surfaces, or in part by walls, may present 

 the following features: branches, Cisotti,^^^ also Reference 2, Sections 11.30-11.43; a 

 point of union, Boggio^^^ and Caldonazzo,^^° perhaps with one issuing from a vessel, 

 Agostinelli;^^^ enclosed deadwater, Caldonazzo,^^^ Cisotti,'^^^ and Brusoni;^^'^ an enclosed 

 source, Hopkinson^^"* and Masotti;^^^ an enclosed vortex, Hopkinson,^^'* Imai,^^^ and 

 Simmons. ' 



A jet issuing from a slot in a plane wall and entering a similar slot in a parallel wall 

 was described by Riabouchinsky. 



297 



