A new or improved device for use in recording the laying capacity of individual birds housed in battery cages

摘要

653,149. Abacuses. INNES, G. L. Sept. 23, 1948 No 24933. [Class 106 (i)] An abacus for recording the laying capacity of individual birds housed in battery cages comprises two rods, one a having a set of nine counters c slidable thereon representing units, and the other b having at least two counters d slidable thereon representing tens, a third rod g with a central double kink h being positioned between the rods a, b to prevent accidental return of the counters after they have been moved past the centre. The device is secured to the cage by feet f.