The recent revival of electrical treatment in medical practice, and new discoveries and inventions resulting from the more scientific methods followed in investigating this class of phenomena, will undoubtedly be productive of most beneficial results to those suffering from diseases which yield to this kind of treatment. Experimental work with static and electro-magnetic machines, induction coils and the adjuncts connected therewith are to be commended to those interested in electrical work, not only for the pleasure and instruction directly attending such work, but also for the practical value of the information resulting therefrom. Anyone who will thoroughly study the construction and uses of such apparatus, and become competent to act as assistant to doctors giving medical treatment, make radio-graphs, etc., will find his services in constant demand in any of the larger cities of the country, and at most remunerative terms, and even if the studies are not carried to this length the knowledge gained will be of sufficient value in many vocations to make it well worth the effort.
The formation of the "American Society of Model Engineers" has already been productive of useful results in the way of designs for tools particularly useful to the amateur. The shaper shown in this issue by Mr. Charles H. Farnum, and a bench planer to be presented at an early date, are the result of interest in the society and several other equally useful tools are promised by others. It was the expectation, in organizing the society, that such information would be forthcoming, and we are extremely gratified that it should follow so soon. A slight delay in the preparation of the literature has been caused by sickness, but this will be sent to those who have requested it at an early date. It is possible that an exhibition of models could be arranged in connection with the "Food Fair" to be held in Boston in October next, provided a sufficient number of readers having them would advise us that the same would be sent. If such an exhibit is desired, write and tell us so, and advise what can be sent. In this connection, we would announce that a design for a working model of a steam locomotive has been offered, and a description of it will be published if a sufficient number of readers request it, but as such a model is not an easy one to make unless one has a fairly complete tool outfit, we await information as to the number likely to be interested before going further with it.
The value of glass may far exceed that of gold. A contemporary draws attention to its enormously increased value when made up into microscope objectives. The front lens of a micro-objective, costing $5 does not weigh more than about 00018 gramme, which weight of gold is worth about one cent, and so the value of a kilogramme of such lenses would be about $3,000,000. The cost of the raw material for making this weight of glass is from five cents, and thus, when worked up into the shape of a lens, the glass has been increased in value about fifty million times. Such disparity between the cost of the raw material and the manufactured article is probably a record in industrial technics.
"Don't tell a man all you know the first time you see him or he will be sorry to see you again. "