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expected of the port engine after similar correction has been made. The engines are not easy to
adjust for maximum economy and performance because of the intermittent demands imposed upon
them and the fluctuating ranges of temperature obtained in the cylinders. In spite of this and
other handicaps, the economical results and flexibility are quite satisfactory. There is a certain
amount of periodic vibration due to the coincidence of mechanical vibrations from the propelling
machinery, but this effect is common to all twin screw vessels.
Apart from the usual minor defects due to years of wear and tear, the outstanding item for
attention is the afterpeak watertight bulkhead which is dangerously weak and thin along the
lower half and should be renewed at the next refit. At the same time the engines will need a
complete overhaul and renewal of the anti-galvanic action zinc plates at the stern-post, for which
there is a greater need owing to the heavy pollution of the river water.
"Alfred Robertson"
This launch has given no trouble in any way, but it is known that the counter-plates are quite
thin due to corrosion during the first ten years of her service. The plates were corroded internally
due to leakages from the rudder post gland left unattended. After scaling the plates in
recent years, only thin plating remained. This wasting condition has been arrested, but new
plates may be necessary at the next major refit.
A considerable reduction in the auxiliary engine running hours has been achieved by using a
portable paraffin heating stove as an alternative to the electric radiators and this accounts for the
use of paraffin in this launch.
Although becoming slow by present launch speed standards, she is suitable for the District
duties and both deck and engine departments are well attended in care and maintenance.
"Frederick Whittingham"
A surprising feature of this smaller launch is its reliability after having been so erratic in
performance during its earlier years of service. Since the structural modifications and complete
mechanical overhaul eight years ago then a gearbox adjustment six years ago, she has given
continuous and efficient service. Her size and robust structure are an advantage in the midst of
barge traffic. Although the maximum speed of 7/2 knots is relatively slow, it is not a real handicap
while doing work on a congested and limited District. Her shortcomings in design are offset
to a great extent by the aforementioned reliability and the high standard of care and maintenance
overall.
"Alfred Roach-
Owing to slight damage sustained to the planking of the transom as a result of an impact from
a small yacht which was out of control, this launch was out of commission and laid aside for
repairs at Thornycroft's boatyard for several days. On another occasion she was given superstructural
modifications to meet requirements for the reception of distinguished visitors. Apart
from these short intervals, the launch has continued in regular service and has met all demands
with its customary efficiency.
8oth engines are running to complete satisfaction and the installation, together with the
equipment and structure are very carefully maintained. The hand-operated window fittings which
are concealed behind the panels are regularly greased, but wasting of the metal components can
only be retarded by grease and it is anticipated that renewals of these fittings will be required
soon.
The zinc plates on the underwater surface at the stern continue to arrest the effects of galvanic
action on the propeller shafts and allied fittings.
The demands for consumable stores have remained steady and the consumption of fuel oil and
lubricants almost the same as last year.
It is impossible to calculate a specific consumption figure for the fuel oil on a horse-power
basis, since the engines arc running on fluctuating loads during the tours of duty, but it is
sufficient to conclude that all the engines operate with a smokeless exhaust and at economical sppeds.

(1) For lighting (2) For cooking and heating (3) For Doctors' lounge and galley
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