nd revolved by a bow in the right hand of the workman, while the left applies the work to the stone.
Grindstone and hangings.
The following recipe may also be employed: —
Sand of the required fineness, 3 or 4 parts; shellac, 1 part; melted, incorporated, and molded under pressure.
Ransome's artificial stone, sand agglomerated by silicate of lime, has been used for grindstones with excellent effect.
In a test trial between Ransome's (English) artificial grindstones and some Newcastle grit to ascertain which had the greatest abrasive effect, it was found that the Ransome stone ground away 1/4 ounce from a steel bar 3/4 inch diameter in sixteen minutes, while a Newcastle stone (natural grit) driven at twenty per cent greater speed required eleven hours to effect the same work.
（London Engineer. )
a, Fig. 2322, illustrates an arrangement for hanging grindstones in which the stone is held between adjustable disks and journaled between anti-friction rollers.
e hollow auger cuts away only from 1/2 to 3/4 of an inch.
This piping is then properly strengthened by iron bands, and subjected to a bath of asphaltum or other cement to make it impervious to gas or water, and to prevent decay.
In Brisbane's pipe, the boards are steamed and bent longitudinally in cylindrical form till the edges lap on each other, and are then riveted.
The old form of tramway laid down in the English colliery region about two centuries since; at Newcastle, in 1676; Whitehaven, 1738.
Subsequently the wooden rail received an iron plate, as with our own early strap-rail system; eventually the iron rail was substituted.
As a cheap expedient the wooden rail is being revived in remote situations where wood is very abundant, money scarce, and iron difficult to procure.
A wooden railway on the 4 feet 8 1/2 inch gage has been constructed from the town of Sorel, at the confluence of the Richelieu River with the St. Lawrence, throug