These tests were done to see how well Morning Glory sparklers would work as an added delay to a device without having to add long pieces of fuse. They are too thick to be practical as fuses alone, but a short fuse can be used with a sparkler taped to it to add delay.

Note: These tests used the 14 inch sparklers. The length of the inside tube is 5 1/2 inches long.

Top: Sparkler Bottom: Tube inside that contains powder

The test: I tested three all in the same way. They were removed from the stick and other wrapping. They were then ignited and set flat on concrete. Each test was timed from ignition to when the powder stopped burning.

#1: 46 sec
#2: 43 sec
#3: 33 sec

Why so short on #3? These sparklers shoot out a good ammount of sparks and also have tiny stars in them. Some of those sparks/stars fell back onto the tube where it had not yet burnt to, skipping a section and shorten burn time considerably. You can see from the picture they create a lot of sparks!

One of the lit Morning Glory sparklers

Conclusion: They burn quite hot and will reliably ignite a properly attached fuse, but should not be relied on for precise timing, as #3 shows. Even the two that worked normally had a difference of 3 sec. Multiple sparklers could be attached together for a longer delay. Metal sparklers (I didn't have any to test) should have a more consistent burn time and could also be used. It must be noted there is a greater fire hazard from a sparkler than from a fuse, be aware of this when using sparklers as fuse.