This device consists of a brass cylinder with capsule. Above the opening in this capsule is ...

Measurement: Sensory (auditory) perception. Instrument for determining the discrimination threshold of the pitch. Physical description: This device ...

Roll-up school chart with a wooden stick at the top and bottom. The top stick has ...

Roll-up school chart with a wooden stick at the top and bottom. The top stick has ...

Roll-up school chart with a wooden stick at the top and bottom and a thin blue ...

Roll-up school chart with a wooden stick at the top and bottom and a thin blue ...

Roll-up school chart with a wooden stick at the top and bottom. The top stick has ...

The albumin meter was used to test the level of the protein albumin in urine. The ...

The albumin meter was used to test the level of the protein albumin in urine. The ...

Ovalen medaillon met een voorstelling van de Annunciatie aan Maria. Een deel van de voorstelling, met ...

Het uitstekende deel bovenaan dit masker was oorspronkelijk gedecoreerd met pluimen. Verder werden rode graantjes ter ...