This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
It is often necessary in a laboratory to siphon acids and poisonous liquids. If a pump is used there is always danger of the liquid entering the pump and damaging it, and, besides, a pump is not handy for this purpose. To fill a siphon by suction from the mouth, great care must be taken t o keep from drawing the liquid into the mouth. One of the best ways to fill a siphon is to procure a large dropper and having pressed all the air out of the bulb insert the end in the siphon. Releasing" the pressure on the bulb will cause it to draw the liquid into the siphon. - Contributed by Bedell M. Neubert, Newtown, Conn.