He hurried through the park, and coming to the shed, switched on the electric light, which revealed a litter of all sorts of objects:  models, parts of machinery, including an aero-cycle on which he had spent many fruitless hours, and, on a bench, a small geographical globe of the world.  Taking up a piece of string, he made certain measurements on the globe, jotting down sundry names and rows of figures on a piece of paper.  Then he went to a telephone box in a corner of the shed, and rang up a certain club in London, asking if Mr. William Barracombe was there.  After the interval usual in trunk calls, he began—­

“That you, Billy?  Good!  Thought I’d catch you.  Can you give me an hour or two?...  What?...  No:  not this time.  No time for explanations just now....  Right!...  Exactly:  nothing ever surprises you.”  (A smile flickered on his face.) “Well, I want you to wire to Constantinople—­Con-stant-i-no-ple—­to some decent firm, and arrange for them to have eighty gallons of petrol and sixteen of lubricating oil ready first thing to-morrow....  Yes, to the order of Lieutenant Smith....  Also means of transport, motor if possible:  if not, horses.—­I say, Central, don’t cut me off, please.  Yes, I know my time’s up:  I’ll renew.—­You there, Billy?  That all right?...  No, that’s not all.  I want you to meet me on Epsom Downs about midnight....  Yes, coming by ’plane....  Wait a bit.  Bring with you four bottles of bovril, couple of pounds meat lozenges, half-dozen tins sardines, bottle of brandy—­yes, and soda, as you say; couple of pounds chocolate, two tins coffee and milk....  No:  I say, hold on....  Also orographical maps—­maps ... o-ro-graph-i-cal maps ... of Asia Minor, Southern Asia including India, Straits Settlements, Polynesia....  I don’t know:  Stanford’s will be shut, but I must have ’em....  That’s up to you.  Bring ’em all down with you....  Well, you’d better light a bonfire, so that I can tell where you are.  You’ll manage it?  Good man!  See you about midnight then....  Yes:  I saw it; bad business.  Hope they’ll manage to hold out....  Tell you when I see you.  Goodbye!”

He replaced the receiver, and turned to find Rodier at his elbow.

“Now, Roddy,” he said, “we’ve got two hours.  Slip into it, man.”

For the next two hours they worked with scarcely the exchange of a word, overhauling every part of the engine quickly, but with methodical care, cleaning, oiling, testing the exhaust and the carburettor, filling the petrol tank and the reservoir of lubricating oil, examining the turbines and the propeller—­not a square inch of the machinery escaped their attention.  When their task was finished they were as hot and dirty as engine-drivers.  They washed at a sink, filled two stone jars with water and placed them in the cage, adjusted the wind screens, and then sat down to rest and talk over things before starting on their night journey.  Smith pencilled some calculations on a piece of paper, referring more than once to the globe.  Then taking a clean piece, he drew up a schedule which had some resemblance to a railway timetable.