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52 | ; THE MaRINE REVIEW 12 B. H. P. MOTOR AND REVERSING GEAR, THORNYCROFT MOTORS. The Thornycrott.motor has four cylinders 8 in. diameter. by 8 in. stroke and develops 100 B. H. P. on Puemot or: 75 B. H.-P. on. parafiin, either power at 750 revolutions. Mo- t@ty Of this type are now being largely adopted for the propulsion of large cruising launches and _ yachts, and an order has recently been re- ceived for an installation of three of these motors for a new vessel now under construction fot a noted Brit- ish yachtsman. A motor of this type is fitted in the Firefly which took part in the Gravesend to Cowes run immediately prior to the Reliability 'Ttials last year, doing the journey in nearly Seven hours less time than any boat competing in the race. This motor is illustrated connected up to the Thornycroft reversing gear. The second motor illustrated here- with has two cylinders 4% in. diame- ter by 5 in. stroke, and develops 12 B. H. P. on petrol and 10 B. H.. P. on paraffin, both at. 1,000 revolutions. It has been specially designed for the propulsion of craft up to about 35 ft. for either commercial or _ pleasure purposes, and has given general satis- faction in «such service. It is ex- tremely simple to handle, and its re- liability has been proved beyond question at the various trials in which. motors of this type have been used. The third motor. is mtended to demonstrate a very simple and ef- fective arrangement for electric light- ing country houses, sailing and other vessels. This type of engine has proved very successful in the hands of amateur motor launch owners, who particularly appreciate the marked su- periority compared with other single cylinder engines. Various types and 6 B. H, P. PETROL MOTOR AND DYNAMO, ne NOL TRE EO LC 100 B, H. P. THORNYCROFT MOTOR AND REVERSING GEAR, f sizes of Thornycroft motors have been employed for stationary purposes (i. e., for working pumps; capstans; elec- tric lighting, etc.), invariably with most satisfactory results, both as_ regards economy of fuel, as well as very small amount of attention and adjustments necessary. It should be added that any of these motors may be adapted for using either petrol or paraffin; and a special arrangement may be provided to use paraffin and petrol together, i. e.,,one fuel may be turned off and the other on, without any preparation, while the motor is run- ning. In view of petrol being as ex- pensive as it is at present the possi- bility of using paraffin with but a slight reduction in the power is a matter which deserves serious con- sideration by users of marine motors. ne, Lhorycroft motor. of all