s front, and the light may be directed in a horizontal are of 180°. Two lamps are used alternately, the carbon-points lasting four hours. Expense, twenty cents per hour.
An electric circuit through the log-line to the detent of an escapement in the register-log, so that by touching a key on deck a circuit may be completed, an armature attracted, and thus the starting and stopping of the mechanical register in the log be exactly timed.
In 1852 an electric loom was exhibited by Bonelli at Turin.
The invention was at that time in a crude state, but has since been much improved.
The object is to dispense with the perforated cards required in the Jacquard apparatus.
For this purpose, an endless band of paper covered with tin-foil is used, on which the required pattern is traced with a varnish, rendering the parts thus covered nonconducting.
This band is caused to pass under a series of thin metallic teeth, each connected with a s
An instrument invented in 1852 by Mr. Peters, an English banker and microscopist, for minute writing.
It consists of an uprightr microscopes long preceded their application to telescopes.
Sir David Brewster exhibited one in 1852 which was made of rock crystal, and was found among the ruins of Nineveh.
The refractive power838, and especially after the construction of the lenticular stereoscope by Sir David Brewster in 1852, the idea naturally occurred of applying this principle to microscopes.
This was first effected
Duty of best engine, from Browne, 1855101.4
Pittsburg high-pressure non-condensing engines, 1852: —
To which ent when the means employed to bring it into work is removed.
In the example, Guild's machine, 1852, a is the shaft, having a fly-wheel b; when the sliding wrist c is over the axis of oscillation o