At the lower end of the shaft, inside the workshop, the device shown in Fig. 6 is installed. The purpose of this appliance is to provide a horizontal shaft upon which pulleys or driving gears may be mounted. The device is constructed of another sewing-machine head similar to the one already described. The head is cut in two and the separate parts mounted on suitable supports. The gap between the sawed portions permits a pulley to be fastened on the shaft to serve as the main drive. The wheel propelled by the treadle of the sewing machine will make a good drive wheel. The small handwheel, originally mounted on the machine-head shaft, is left intact. This arrangement gives two sizes of drive wheels. Heavy sewing-machine belts will serve to transmit the power.
The Tower
The tower can be built up in any manner to suit the conditions. Ordinarily sticks, 2 in. square, are suitable. These are well braced with wire and fastened securely to the roof of the shop. The arrangement of the tower with the mill is shown in Fig. 7.
the Manner of Building the Tower on Which the Supporting Standard Revolves (Fig. 7)
Telegraph Code on Typewriter Keys
A very simple and practical method of transcribing wireless time and other messages on the typewriter without having such perfect knowledge of the Morse system as to be able to immediately translate it into the common alphabet is the following: The characters of the Morse system are inscribed on small slips of paper—thus, three dots (...), for the letter S; two dashes (—), for the letter M, etc.—and these slips are pasted on the corresponding keys of the typewriter. The operator puts on his receiver, and the proper key is struck as he hears the corresponding Morse letter. As there are no capitals, spacing between words, or even punctuation, the manipulation of the typewriter is much simplified, and it is easily learned to record the signals as fast as they are heard.
An Aid in Sketching Profiles
The means usually employed by most beginners to obtain the correct outline of an object, such as tracing or a pantograph, make them dependent on mechanical help rather than train the eye to form and proportion a drawing correctly. The device shown not only greatly assists the beginner, but actually trains him toward a point where he can dispense with any such device and correctly sketch by free hand. It also has the effect of encouraging the beginner, because his first efforts will not be complete failures, as is usually the case.