New Patent for Berdan Basins.

Cromwell Argus, Volume III, Issue 147, 3 September 1872, Page 7

New Patent for Berdan Basins.

Berdans are now a necessary appendage to every crushing-mill. As amalgamators, they are found to ba most useful, and for the treatment of blanket-washings and other residue they are the most perfect of the many inventions which have been applied on this field. But tho cost of metal expended by ordinary wear ha 9 proved a very serious item of expense ; and with a view to lessening this expense, Mr Corbett, a practical engineer, now in the employment of the Moanataiari Company, has brought forward his invention. It is this. The whole of the inside of the basin is to be lined with metal of such thickness as to wear fur the same length of time as the basins do at present. The liners are fitted into the basin in twelve segnents. Instead of the usual revolving ball, a drag ball weighing sc\vt. is used to grind the stuff. This drag is made to fit the hollow of the j basin, and presents a large grinding surface ; | and to compensate for loss of weight caused j by the wearing away of this drag, it is so conj structed that pressure weights can be affixed. J Berdans on this plan have for some time past j been at work on the Moanataiari Company's | battery, and are found to act admirably, j whilst the saving of expense is very consideri able. The ordinary expense of v a berdan basin is from L.30 to L.35, and its duration, if kept in constant work with a drag ball instead of a revolving ball, would nut exceed six months. The cost of a set of liners similar to those we have described would be from L.lO to L.12, and thoy will wear fully as lung as the berdans, and could be replaced in about two hours, whereas the time occupied in replacing a berdan would not be much less than two days. The mode of attachment is simple, and consists of four small screws. Mr Corbett has applied to the New Zealand Go- ! vernment for letters patent for his invention. | —Thames Advertiser.