Handy man's workshop and laboratory . eing determined. To make the indicating instrument, procure a piece of jewelerstubing with an outside diameter of not over 3/32 of an inch andan inside diameter as large as an ordinary hatpin. The tubing Ris fitted into a hole in the center of an ordinary nail, S, and thepointed end of a hatpin is driven into the baseboard of the instru-ment through the tubing to form a center for the armature 5* torevolve upon. A short piece of soft iron is soldered to the endof the nail at right angles as shown at T. The magnets N aremounted on small brackets U, with the
Handy man's workshop and laboratory . eing determined. To make the indicating instrument, procure a piece of jewelerstubing with an outside diameter of not over 3/32 of an inch andan inside diameter as large as an ordinary hatpin. The tubing Ris fitted into a hole in the center of an ordinary nail, S, and thepointed end of a hatpin is driven into the baseboard of the instru-ment through the tubing to form a center for the armature 5* torevolve upon. A short piece of soft iron is soldered to the endof the nail at right angles as shown at T. The magnets N aremounted on small brackets U, with their poles facing the centerof the armature and in close proximity to the path of the piece Tas it is swung about. The needle P, which is soldered to theupper end of the tubing R, will travel with the armature over thedial face V, which is graduated to show the various windvelocities.—73 GYROSCOPE MADE FROM A BICYCLE The accompanying illustration, Fig. 173, shows how a good-sized gyroscope can be made out of an old bicycle. The turn-. nft ::::;::C:r^m Fig. 173—Bicycle wheel gyroscope table A is furnished with a ball-bearing mounting by attachingit to bicycle pedal. The pedal is secured on a stand, to whichthe pedal spindle is bolted. An ordinary bicycle wheel is indi- I96 HANDY MANS WORKSHOP AND LABORATORY cated at B with its axis extended, by screwing on a pipe in placeof the ordinary nuts. At one end of the axis is a hook, C, bywhich the wheel may be hung and be swung as a pendulum toshow the curious path taken when the wheel is spinning hori-zontally, and also how it resists any change to its plane of rota-tion. D D are supports with grooves in which the extended axiscan rest. Stops E E E are to prevent the wheel from slidingdown the groove when its axis is raised toward the vertical. Theapparatus is worked as follows: First. Placing the wheel B in between the supports D D, theturntable can be spun round, to show that the wheel remainsinert when not spinning; spin the whee
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