Abstract: Golf practising apparatus comprising a housing (1) having mounted therein a capstan (7) for a line (19, 26) which has a golf ball (27) attached to one end thereof. The housing is provided with a pivotal ground anchorage device (20) and an elongated line guide (23) which includes a guide member (24) embracing the line. The line comprises an outer highly stretchable elastic line part (26) and a further line part of low stretchability. Attached between the two line parts is a stop (25) which is intended to co-act with the guide (24) and prevent the first line part from being wound onto the capstan. The apparatus also includes a brake which applies to the capstan a braking force which increases with increasing lengths of line-paid out from the capstan.

Abstract: A flotation collector composition comprises a combination of fatty acids, amidocarboxylic acids or amidosulfonic acids and partial esters of phosphoric acid and alkoxylated alcohols. The collector composition is used for upgrading nonsulfide minerals containing alkaline earth metals by froth flotation. Minerals such as apatite, calcite, scheelite, fluorspar, magnesite and baryte can be separated from the gangues using the collector composition.