3, Shaffner, 1869.No. 117,577, Taylor, 1871.
No. 93,754, Shaffner, 1869.No. 120,776, Roberts, 1871.
A name for nitro-glycerine (which see).
An instrument for detecting the quality of niter.
Nitrous oxide (N O), commonly called laughing-gas, is frequently employed in dental surgery as an anaesthetic.
It may be procured by simply heating nitrate of ammonia, or by the action of nitric acid on copper or mercury.
S. S. White's nitrous-oxide apparatus.
The apparatus shown in Fig. 3331 is designed for the production and retention of this gas on a large scale, for the purpose of inhalation.
It consists of a retort and heater a, purifier b, gasometer c, which may contain 40 to 50 gallons, and inhaler d. The gas generated in the retort passes through the pipe e to the purifier b containing a solution for removing impurities; in this are arranged seven inverted tumblers, shown in plan at B, through which
in the case and delivers the stroke.
The electric attraction in each case imparts the effective stroke.
The wires incased in insulating material enter the handle end of the instrument, and by their flexibility permit its manipulation by the operator, who has simply to hold the bit in proper positions until the operation is completed.
The application of this instrument in larger size to stone-cutting and other work has been proposed.
Green's electro-magnetic mallet, manufactured by S. S. White of Philadelphia, for packing and condensing gold in filling teeth, strikes direct and very rapid blows, perfectly adjustable as to force, and either continuous or dependent upon touch; the blow being given when the point of the plugger is pressed upon the filling, and ceasing when the pressure is removed.
Among the ancients some success was obtained in the art of dentistry.
Casselius was a dentist in the reign of the Roman triumvirs, and gold was used for the filling.
Nearly 500 B. C
151,779.Hopkins, June 9, 1874.
157,647.Starr, Dec. 8, 1874.
154,082.Ransom, Aug. 11, 1874.
161,656.Birdsall, April 6, 1875.
170,731.Heigs, Dec. 7, 1875.
Fig. 6997 shows several applications of vulcanite to car-springs.
a has metallic cups with vulcanite cushions.
b has polyhedral blocks of vulcanite.
c has annular corrugations.
d The block is a frustum of a cone.
See also Figs.
1142-1144, pages 482, 483.
S. S. White's vulcanizer.
A furnace in which the flasks containing the dentures are exposed to a heat sufficient to combine the sulphur and caoutchouc, and produce the compound called culcanite.
In Hoffstadt's self regulating vulcanizer, the flame is regulated and the degree of heat indicated by the tap of a bell when it has reached the desired point.
The gas stopcock is actuated by a thermostat, which comes into effective action at a prescribed degree of temperature.