Brazilian river gunboats built in England according to the Dutch magazine Marineblad dated 1904-1905 no. 4

An item reported that Yarrow, England was building for Brazilian account 4 river gunboats with as dimensions 36,5 x 3,65 x 0,65 metres and a speed of 12 miles and 3 smaller gunboats especially for service on the Amazon river with as dimensions 22,8 x ? x 0,32 metres.