Glass insulators were first produced in the for telegraph lines, then for telephone and power transmission lines insulated from the wooden poles that held them up. They had to insulate the wire from the wood and for this, they
Indoor Tulips - Fill glass container about with glass marbles or decorative rocks. Set tulip bulb on top of marbles or stones; pointed end up, add more marbles or rocks; so bulb is surrounded but not covered. Pour fresh water into the container.