four o'clock
-LSB- Illustration : `` Do n't shoot , '' he protested . `` What 's the use ? '' -RSB- The aviators had both tea and water , but they drank only the latter and made no attempt to use the heating apparatus . At four o'clock the increasing snowfall was beginning to give the machine some trouble , and yet it was plowing its way steadily through the air and neither boy was more than apprehensive . Soon after this the snow ceased suddenly and the wind rose as quickly . `` We 're losing some of our extra cargo anyway , '' announced Roy , as the first gusts tore some of the accumulated snow from the weighted planes . `` And we 're losing some considerable gas , '' added Norman .