Dabbers.

Dabbers.

Do not leave large spaces in between, end let the strip they are painted on be of a good length, so as to give greater variety. Have a thin piece of wood fined to the end of the strip, to serve as a handle, and when the slide is being exhibited insert the strip of glass, and push it slonly along.

This is only an amateur contrivance, but will answer several purposes, especially whenever some small objects arc required to more straight along and disappear, while the larger part of the picture remains stationary. A ship as in full sail can be drawn across a sea-piece by this contrivance.

Fig. 72, known as the lever slide. is used when the motion of the movable piece of glass is to be up and down, and 12 years, the galvanic battery occupies almost exactly the same position as a generator of electricity that it did at the beginning of that period. This state of things is certainly not due to a lack of interest or want of investigation, for although the professional inventor and most of those who look to electricity for their livelihood hare turned their attention to fields offering more immediate returns for their labours, there are probably very few amateur electricians who have not at one time or another dabbled in the subject in the hopes of making some discovery which would bring both fame and fortune.

Lever Slide.

Lever Slide.

On the other hand, it cannot be said that the subject is not a promising one, for the broad idea of the direct conversion of chemical into electrical energy covers many possibilities, as does the kindred one of the conversion of heat into electrical energy through the medium of electrical energy, and any real advance in either of these directions must be of the most widespread importance.