EQUIPMENT OF \.\ RGG BREAKING PLANT. 1 ,°> 
available and individual preferences. It may be made of J-inch 
pine boards battened on the under side and covered neatly with zinc 
0.0201 inch thick, 1 tin or nickel-plated copper 0.0188 inch thick, or 
monel metal 0.0201 inch thick. The lower side of the table may be 
covered with the metal also, if desired. Boiler iron J inch thick, which 
may be painted with white enamel, or iron on which the enamel has 
been applied by a baking process, is also used for table tops without 
a foundation of wood. The enamel in each case chips, so that it must 
be renewed every season. Sometimes heavy galvanized iron is riv- 
eted at the edges to an angle iron frame and used without the wood 
support. Occasionally white glass, cemented into an angle iron 
frame, is used for a table top. The sides of the central opening for 
the funnels should, in this case, be lined with metal to prevent 
chipping. 
The legs are made of 1-inch and the braces and crosspieces of 
f -inch galvanized iron pipes (inside measurements). They are fas- 
tened to the table by means of flanges, using square-headed bolts 
countersunk in the wood before the metal covering is laid. In tops 
without wood, flat-headed bolts countersunk in the metal are used. 
The center of the top of each leg should be 3 inches away from the 
edge of the table. Angle iron legs bolted at the corners to the angle 
iron frames are used for tables having glass tops. The legs should 
be furnished with a roller or ball castor 1 inch in diameter. Tables 
made for more than four girls require central supporting legs which 
should be braced on both sides and connected with crosspieces. 
The tray rest is mounted on a galvanized iron pipe or nickel- 
plated brass tubing 8 inches long and f inch in diameter (outside 
measurements), which passes through the table into a pipe flange 
screwed to the under side of the table. The metal covering of the 
table is soldered to the pipe. The tray rest may be made of two 
pieces of -j^-mch by 1-inch bar iron welded together at right angles 
at the center, with the ends turned up J inch. The two arms are 
made to receive the breaking tray, the distance between the turned- 
up ends being 10 inches on the arm parallel with the short side of the 
table and 9 inches on the other arm. Countersunk flat rivets are used 
to fasten the arms to a pipe flange connected at the top of the pipe 
support. If preferred, the tray rest may be made of metal cut in 
the shape of a diamond, with the corners turned up to hold the 
breaking tray in position. Circular rests are also used. 
SHELL FUNNEL. 
(Figs. 11 and 12.) 
The shell funnel fits loosely in an opening in the center of the 
breaking table, in front of the rests for holding the breaking trays. 
1 Equivalent to No. 10 sheet zinc gauge. 
