grading feeders under the main hoppers. The "Marsden" unit is fed by shutes from the main storage hoppers. Bitumen is piped from a "Clarmac" 3,500-gallon electrically heated boiler and from two 1,000-gallon oil-fired boilers. The output of each mixing unit is 125 tons per 8-hour day. As was to be expected, The new installation at Tsat Tse Mui was not without its teething troubles. Unfortunately sited in a residential area, considerable nuisance was caused by dust, necessitating the construction by the Mechanical Workshops of a dust extraction plant. The crushing plant was completely housed-in and temporary blowers, ducts, and collecting channels installed, but this was not completely successful in abating the nuisance.
159. With the increased demand for all sizes of crushed stone and bituminous macadam, it was necessary during the latter half of the year to work two 8-hour shifts at both quarries. This had the effect of increasing the annual production at Hok Un from 47,000 tons of stone to 60,000 tons.
160. The following table gives the output of quarry products over the three past years:
Quarry Crushed Stone (tons) Tarmac (tons) 1949/50 1950/51 1951/52 1949/50 1950/51 1951/52 Hok Un 40,510 46,776 60,203 25,928 32,233 22,885 Morrison Hill 24,935 29,887 11,626 Hung Shui Kiu 2,375 6,670 2,229 419 Tsat Tse Mui 29,506 10,537 Totals 42,885 53,446* 91,938 51,282 62,120 45,048Page 55