Setting up a tree by the street-side window of his parlor, Johnson hand-wired 80 red, white and blue light bulbs and strung them together around it, and placed the trunk on a revolving pedestal ...

You can just eyeball the measurement, but if you don’t want to be short of lights, it’s better to actually measure the tree. Then determine how much spacing you want between each bulb on the ...

the rest of the bulbs will stay lit even if one goes out. No matter what kind of lights the machine makes, they're finally ready to be hung up on a Christmas tree.