Thermochrom Crayons (Pencils),. 1950-53
1950-1953
Steel Specimens showing Colours for Tempering, 1801-1900
1800-1824
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone in Stand, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Calorite stand
1925-1931
Ceramic Temperature Indicator Cones and Stand, 1925-1931
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-1931
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Fire Clay Temperature Indicator Stand, 1925-31
1925-1931
Fire Clay Temperature Indicator Cone, 1925-31
1925-1931
Portable thermistor pyrometer indicator (serial No. 92757 P1) in wooden case
1950-1952