Show speed trials or gunboats Gun boats san francisco may 24 when the wheeling and alie marietta the twin gunboats bently completed by the union iron works for the united states government have their speed trial on tuesday it will over a new course which has been laiti out between tiburon and el campo it ia exactly one nautical mile in lenyth heretofore ariale have been ande in a stretch of the bay extending nautical miles but tho water was shallow and lessened the speed ot the vessels and the dense smoke issuing from the refinery chimney one 0 the object points usually obscured the rear signal of alie norih range so that II 11 ns impossible to tell the exact when the vessel had the distance in j quence a new course has breu baij out atie charte will be of value to builders and owners desiring to test the of their vessels as the are to be permanent and marked by granite |