AN EFFECTIVE BIKE SIREN

Evening Star, Issue 22881, 12 February 1938, Page 8

AN EFFECTIVE BIKE SIREN

If you have nimble fingers you will be able to make a bike siren out of an empty tin and a few odds and ends. Figure 1 shows the siren seen from the front. The tin (a) has a hole in the side, through which a round wooden stick (b) is inserted. The hole must be slightly larger than the diameter of the stick. A strong rubber band is threaded through four other holes in the tin, it is taut, and tied. in .a knot (c). One end of the round stick is firmly tied to this rubber band. A piece of string (d) is tied to one of the rubber bands, and passed through a little hole in the tin. This hole must

be so placed that the stick is pushed a little distance outside the box when the string is pulled. In between these ■two holes, yet another hole is hpred,this time so large as to fit an ordinary bicycle nut and bolt. Figure 2 ,show* the siren from the side; you will recognise the same holes as in figure 1. As shown in figure 3, the siren is attached to the left fork of the bicycle. It can be fixed by means of a strip of tin or leather held on to the tin by the nut (e). The string (d) is then tied to .the left handlebar, and the wooden stick (h) is adjusted so that the end just touches the spokes of the_ front wheel if the string is pulled slightly. The stick will then hammer wildly on the tin. The holes in the tin must, of course, not be so sharp that they cut the strings. ,