Bar & Gauge apparatus

• Iron rod with handle: 235 mm
• Bar dimension: 12 x L110 mm
• Diameter: 12mm
• Brass gauge with handle: 133 mm
• Gauge dimension: 145 x 30 x 5.5 mm

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Bar & Gauge apparatus illustrates the expansion by heating and the contraction by cooling.
It contains an iron rod 107 mm long and 110 mm diameter mounted on a support rod fitted with a wooden handle, a brass gauge 145 mm x5.5 mm with a cut-out, with just admits the bar lengthways, and a hole that passes the endways when cold.