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.
When siphoning off acids or other disagreeable or poisonous liquids, it is very important that none of it touch the flesh or mouth. It is almost impossible to do this when starting the ordinary siphon. A siphon that does away with this inconvenience and danger can be made as follows:
Procure a good Bunsen burner and two pieces of 1/4-in. glass tube, one 2 ft. and the other 18 in. long. Heat the 2-ft. length at a point 8 in. from one end in the flame until it can be bent as shown at A. The other piece should be plugged at one end and then slowly and evenly heated at a point 10 in. from one end. When the glass is soft, blow slowly and steadily into the open end, at the same time turning the tube around in the flame. This will form a bulb, B. The ends of the glass tube are heated and bent as shown, at C and D, and then fused onto the piece A, as shown at E. This can be accomplished by heating the piece A at a point 4 in. from the unbent end. When the glass becomes soft, place one end of a short piece of tube in it and pull out into a thread. Break this off as close to the tube as possible, to make a hole in the tube. Heat the end of the tube D and also the glass around the hole, and when both become soft, they can be fused together.
Ill: When Starting This Siphon It is Difficult for the Liquid to Touch the Mouth or Flesh
In use, close the end not in the liquid and, placing the mouth at F, exhaust the tube, thus filling it with the liquid. When the closed end is opened, the siphon will flow. The liquid collects in the bulb, and if a little care is used, none of it can reach the mouth. - Contributed by O. F. Tronnes, Evanston, Ill.