D.—l.

Public Works Department Construction Works— continued.

66

-**tt _ „ , P er Cubic Yard. Q . Remarks (including Lead and Useful JSTame of Work. Nature of Work. Type of Plant used. \ ■ • I - Saving. Data): Time Comparison. Hand. j Machine. Per Cent. Nelson Aerodrome .. .. Shifting material for formation .. Diesel tractors, with carry-alls and £108,582 (estimate) £23,582 (contract) . . Saving in cost of £85,000 by use scoops of contractor with machines as against hand labour ; value of machines, £20,000. Timaru Airport .. .. Excavating and loading fine sandy Diesel tractor and carry-all .. 2s. 6d. 2|d. 91 • 7 Average lead by machine was clay 3 1 chains longer than that of hand labour. ,, .. .. Excavating ditches for drainage.. Public Works Department designed 2s. 6d. 2d. 93-3 ditcher „ .. .. Excavation from larger drains Diesel crawler drag-line, f yard.. 2s. 6d. 6d. 80-0 direct to bank „ .. .. Excavating and dumping fine } yard crawler-type Diesel drag- Is. 6d. 3d. 83-3 beach shingle line ,, .. .. Excavating heavy pug under water |- yard crawler-type Diesel drag- .. Is. .. Manual excavation impossible line without construction of expensive coffer-dam and using pumps. Ashburton — Lyndhurst irrigation Excavation of main race in shingle Diesel tractor grader and angle- 3s. Is. 6d. and 2s. 57*6 to 43-5 Estimated reduced cost with scheme and silt dozer improved technique and designing races to suit machinery, Is. per cubic yard. Rangitata diversion race .. Excavation from coarse shingle Diesel tractor and elevating grader 4s. Is. 75-0 and silt, with occasional massive boulders South Island Main Trunk Railway, Excavating to fill .. .. Diesel crawler - type excavator, 3s. 6d. 2s. 42-8 The speed is increased five times Hawkswood, cutting headings f yard by use of machines. Mangere Aerodrome .. .. Levelling and filling .. .. Petrol locos, and trucks .. 3s. 7d. Is. 9d. 51-16 Devonport Naval Base .. .. Excavating spoil and loading .. Diesel shovel, crawler type .. 2s. l-87d. 8-6d. 66-7 Loading into lorries. Kaimai road construction .. Excavating .. .. § Diesel shovel, crawler type .. Is. Is. 41-4