Economy Hope's Apparatus Material_Cork Borosilicate glass U-tube manometer with

Borosilicate glass U-tube manometer with a built-in stopcock mounted on a back-plate 80-0-80 scale at 2mm subdivisions

Used to find resonance points in an open air column by sliding the tube length against a struck tuning fork

001 inch with a friction roller and a lock mechanism for held readings

sized for the next step up from the 100uA meter when small-signal circuits exceed its full-scale deflection

available in voltage ratings from 2

Economy Hope's Apparatus Material_Cork Borosilicate glass U-tube manometer withEconomy Hope's apparatus demonstrating the anomalous expansion of water near 4C as thermometers at different heights register densest water sinking while colder water rises.