File:Scientific American Volume 06 Number 21 (May 1862) (1862) (14760492091).jpg

Identifier: scientific-american-1862-05-24 (find matches)
Title: Scientific American Volume 06 Number 21 (May 1862)
Year: 1862 (1860s)
Authors:
Subjects: patent combination purpose patents ment iron scientific manner purpose set claim wrought iron sulphuric acid scientific american fat acid address munn emery wheel patent office purposes set specific gravity
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e visible from the same station. For secret dispatches the alphabet may of coursebe altered so as to be intelligible to those only whohave the key. The patent for this invention was granted, through the specification of this invention, with engravingin the next number of the Scientific American. The Sole-Cutting Business. The Bay State, Lynn, Mass., says:—Within thepast ten or fifteen years there have been great changesin the shoe manufacturing business in this city, andwe presume that changes of a similar character havetaken place in other towns where the manufacture ofladies and missesboots and shoes has been carriedon. Within that period the sewing machine and thesole-cutting machine, and different kinds of machin-ery for heeling have been introduced. And the in-troduction of machinery has led to the systemizing ofthe business in such a way as greatly to facilitateproduction. The commencement of the sole-cutting businessmay properly be dated to the time, or about the Tia.l Fi,. 2
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COLVIN AND GARDNERS LIGHT TELEGRAPH. tical sections, while Fig. 8 represents the mode ofoperating a lantern from the masthead of a vessel. A is a close lantern provided with a lamp, B, andhaving a glass, a, in one side opposite the flame. A con-ical reflector, C, is placed outside of the glass plate tobend all the rays that issue into parallel lines so as toform a cylindrical beam of light. Inside of the glassplate, a, is arranged a shutter, D, in such mannerthat when this shutter is down no light can issuethrough the glass, but by raising the shutter thelight is exposed. To enable the shutter to be raised and lowered withgreat ease and rapidity it is operated by electro mag-netism. A lever, E, is connected with the shutter,and passing through a slot in the side of the lantern,has its fulcrum at b, and carries upon its shorter armthe armature, H, of the electro magnet, G. Whenthe circuit ef this magnet is closed, the armature isdrawn down and the shutter is raised, exposing thelight.

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