晨晴71°。
北京晨晴71 。
因腹泻告假。
晨起腹泻,故托孟和为余告假,不出席文教委员会全体委员〔会〕。八点半至东华街购Sulpha非lanidine 二十粒,计费一万六千元。九点至院。阅来往信件。又院务会议余演讲稿。改好。又阅张济舟交来东北考察团报告。十一点半田。中膳后睡一小时。晚吃挂面。梁方仲来,知渠在岭南大学一年,与姜立夫及陈寅恪同事。
立夫夏季愿来京,因渠知数学筹备委员会渠已不在筹备主任之列,单任委员而已。
寅恪则任唐代史及元微之、自乐天之诗,目巳几全失明,但由助教写黑板云。方仲在杭州曾停数天,寓严仁膜家, 与虞振镛同车来京。在广州时曾常见谢文通、吴文晖、黄炳坤云。阅苏联地图。
雷雨雹子之可以用人力阻止。Nature May 20 , 1950 , pp. 784-85 , PhysicalSociety’s Exhibition, British Sc. Instruments.It had been aITanged thal Sir Robert Watson-Watt (president of Royal Met. Soc.)should deliver the 4th discourse on April 5 , his subject being ” The Earth Atmosphere”, but he foregoes his discourse in favor of Dr. V. 1. Schaefer (G. E. Co. ofN. Y. ) , his subject being ” Experiments with Cloudy Skies”. He described the formationof snow & ice crystals and ( ice) ( clouds) in laboratory. Silver iodide acts 出nucleusaround OOC. In a large-scale experiment, an area of about 3∞ sq. miles had beencleared over N. Y. when the surrounding countηwas overcast. Dr. Schaefer predictedthat eventually it would be possible to do away wilh thunderstorms by dispersing or modifyingthe cloud structure before they reach their intense stages. The lecture was in a natureof running commenta巧to a series of beautiful colored photographs of ice & snowcrystals , cloud formatÎons & turbulence , and photographs taken above 由e clouds showingthe effects of ‘ seeding’ , with silver iodide.