H. M. I. Manufacturing Co offers Sandglass for Time Measurement. H. M. I. Manufacturing Co also manufactures various types of nautical binoculars, ceiling lamps, nautical compass, nautical sundials, decorative globes, nautical sextant, antique telescopes, metal key rings, antique projector, magnifier, decorative candles, antique products, sand timers, lampshade, compass, residential lamps, diving helmets and wooden furniture. The Sandglass for Time Measurement consists of two glass bulbs placed one above the other which are connected by a narrow tube. One of the bulbs is usually filled with fine sand which flows through the narrow tube into the bottom bulb at a given rate. Once all the sand has run to the bottom bulb the device can be inverted in order to measure time again.
