Pise-de-Terre. 275 



(7) Rammed earth at box-ends to form a key with special 



break. Stop joints or bevelled down to a 45 deg'ree slope 

 so as to splice well with new span of pise adjoining. 

 When door and window openings occur, the special stops 

 to be adjusted and firmly secured so as to withstand hard 

 ramming. Two 4 inch by 2 inch by 9 inch plugs to be 

 built into each window-jamb for securing of the frame, 

 and three to each door- jamb. 



(8) Insert below floor le^vel where directed a suitable numbetr 



of 3-inch field draining-pipes to act as ventilators through 

 i\\e thickness of wall The same may be added as roof- 

 ventilutors where required. Insert wire-mesh stops to 

 exclude vermin. 

 (0) Set all frames square and plumb, and where in outer walls 

 flush with finished exterior plaster-face, the joints being 

 covered by a 2-inch by |-inch fillet. 



Where lintels occur, they are to be tailed in at least 

 9 inches on each side of opening. 



Provide plain picture rails round all rooms at window- 

 liead level, providing plugs for fixing where necessary. 

 Secure to floor round all boarded rooms a 2-irich by lA-inch 

 angle fillet as skirting. 

 nO) The smooth surface of the pise walling to be hammer- 

 chipped to give good key for plaster. Before rendering or 

 plastering walls, any loose earth or dust to be removed with 

 a stiff brush and the wall surface evenly wetted. 



The rendering to be carried evenly round the walls — 

 the minor square angles being roughly chipped down first 

 so as to obviate sha^p corners. The main corners of the 

 house are iready-rounded off at 9 inch radius by special 

 corner-moulds. 



(11) Bond brick and slab work to pise walls by driving iron 



spikes into the latter every few courses at joint level and 

 bedding in. 



(12) Colour-wash walls with tallow-lime whiting tinted with 



ochre. Provide 2 feet skirting of pitch, applied hot, to 

 form base course round exterior of building. 



Centrifugal Pumps. 



Ordinary recjproc.vting pumps will throw Avater at almost any 

 speed of the pump, i.e., whether tlie plunger makes only a few or 

 many strokes per minute, but not so in the case of a centrifugal pump. 

 The makers of centrifugal pumps invariably stamp on the little brass 

 plate mounted on the pump, the speed in revolutions per minute at 

 which the pump must be run to throw water at its maximum efficiency. 

 If, for instance, it is stated on the pump that it must be run at 

 1700 r.p.m., it is no use trying to get water with the pump running 

 only, say, 1450 revolutions. The pump can be run at speeds higher 

 than the speed called for without danger, and with a little increase 

 in the output of the pump, but at speeds lower than the required speed 

 the pump will deliver considerably less water than the smnller speed 

 would lead one to expect. 



