STATE GEOLOGIST. 237 
one-half of the drum to slide forward upon the frame work of the sulky 
and the batch is delivered upon the ground, thus leaving the drum in the 
position shown in figure 139, which gave it the name “Dromedary Mixer.” 
It is especially useful where conduit or street work is being done and the 
material must be stored at intervals along the line of work, and must be 
conveyed some little distance to the point of construction. These machines 
are made in size for about one-half yard batches and cost $250.00 apiece, 
a OB. Washineton, «se 
MOLDS. 
The first forms or molds used were simply constructed of planed 
lumber well braced and were for monolithic structures. The forms used 
by the Ransome Company in their concrete construction consist of short 
lumber frames reinforced with joists and bound together through the 
walls with rods and wires. ‘These forms are raised for every three or 
four feet in elevation of the wall. 
Thos. C. Farrell, of Washington, N. J., has designed a set of adjustable 
forms for monolithic concrete construction that is quite simple in adjust- 
ment. Metal shoes and “box caps” of cast iron shaped in the form of an 
extended H make the holders for two inch plank. Figure 140 illustrates 
their method of use under almost every condition to be met. The shoes 
and cross bolts leave holes and indentations in the walls which must be 
plastered up and smoothed over with cement mortar in order to make 
the wall have a smooth uniform appearance. By the aid of these forms 
but a comparatively small amount of lumber is necessary to carry on 
relatively large building operations. The operation is to set one course of 
ten inch planks around the entire structure as shown in the illustration, 
fill with concrete and tamp. Set up another course and fill with con- 
crete, and so continue until four ten inch courses are filled. Then 
remove the bottom course and place it on top and proceed in this 
manner to the finish. By this method, the course to be tarmped never ex- 
ceeds ten inches in depth. The builder can reduce the thickness of the 
layers by making three layers of concrete to two tiers of plank if he so 
desires. These forms are easily set up, taken down and moved from one 
structure to another. 
The Clark Patent Circular Mold is another form for monolithic 
construction. Jt consists of an inner and outer metal shield or form, 
braced and reinforced, leaving an annular space for the monolithic wall. 
Jt is especially designed to fill the demand for concrete silos, tanks, grain 
bins, manholes, etc. 
BLOCK MACHINES. 
The block machines are all very similar in general principles, but 
differ in minor mechanical applications. 
