d and gradually corroded, while at the same time a beautiful arborescent precipitation of metallic silver took place on the lower wire.
Acetite of lead and sulphat of copper were similarly decomposed and precipitated on the lower wire. — Monthly Magazine, August, 1800.
In 1801, Wallaston demonstrated that a piece of silver in connection with a more positive metal placed in a bath of sulphate of copper became covered with copper and would stand burnishing.
It was not until 1838 that Mr. Spencer gave it a practical bearing by making casts of coin and casts in intaglio from the matrices thus formed.
Professor Jacobi of Dorpat, in Russia, had been an independent inventor, and in the same year brought forward specimens which were much admired and caused him to be put in charge of gilding the iron dome of the Cathedral of St. Isaac at St. Petersburg.
This dome weighs about 448,000 pounds, and was electro-gilded with 274 pounds of ducat gold.
The process, briefly described, is
arps's, Burnside's, Maynard's, Merrill's, and Spencer's.
Sharps's rifle (O, Plate 16) has the ba80,512
Gallagher22,728Smith30,062
Gibbs1,052Spencer94,156
Hall3,520Starr25,603
Joslyn11,261Warn9.
26,362S. W. MarshDec. 9, 1859.
*27,393C. M. SpencerMar. 6, 1860.
27,509N. L. BabcockMar. 20, 2.
35,488J. C. CookeJune 3, 1862.
*36,062C. M. SpencerJuly 29, 1862.
36,466F. W. HoweSept. 16, 11864.
45,797J. RiderJan. 3, 1865.
*45,952C. M. SpencerJan. 17, 1865.
46,671F. W. HoweMar. 7, 186.
58,444R. McChesneyOct. 2, 1866.
*58,737C. M. SpencerOct. 9, 1866.
*58,738C. M. SpencerOct. 9, C. M. SpencerOct. 9, 1866.
59,500C. C. ColemanNov. 6, 1866.
60,106H. H. WolcottNov. 27, 1866.
*60,910T. W. LaneJan. 15,405M. J. ChamberlinFeb. 4, 1873.
135,671C. M. SpencerFeb. 11, 1873.
137,625C. SharpsApr. 8, 187.
409C. ParkhurstSept. 25, 1837.
34,319C. M. SpencerFeb. 4, 1862.
44,991E. WhitneyNov. 8, 1864n and A. C. CampbellOct. 21, 1862.
*38,702C. M. SpencerMay 26, 1863.
*38,935A. BallJune 23, 1863.
en-sail.
Specific names of various derivations:—
Bonnet.Driver.
Jib.Lug.
Ring-tail.Save-all.
Skysail.Spanker.
Spencer.Trysail.
Names derived from normal position:—
Fore-and-aft sail.Studdingsail.
Water-sail.Bonnet.
By position57.
21,234JacksonAug. 17, 1858.
22,17HookNov. 30, 1858.
23,285BoyntonMar. 15, 1859.
24,027HookMay.
17, 1859.
24,061SpencerMay.
17, 1859.
24,973JenksAug. 2, 1859.
25,013HarrisonAug. 9, 1859.
25,262HarrisonAug. 26, 1859.
30,854HandieDec. 4,8,069WickershamAug. 25, 1857.
20,175SmithMay 4, 1858.
20,531SangsterJune 8, 1858.
21,461WoodruffSept. 7, 1858.
22,137Spencer et al.Nov. 23, 1858.
22,255MackenzieDec. 7, 1858.
23,157CooperMar. 8, 1859.
26,130SingerNov. 15, 1859.
26,366Mitchelication of the art of electroplating which originated with Volta, Cruickshank, and Wollaston, about 1800-1801.
In 1838, Spencer, of London, made casts of coins and cast in intaglio from the matrixes thus formed; in the same year Jacobi, of Dorpat,