What happened May 1907 AD

In 1906 Carrier discovered that "constant dew-point depression provided practically constant relative humidity," which later became known among air conditioning engineers as the "law of constant dew-point depression". On this discovery he based the design of an automatic control system, for which he filed a patent claim on May 17, 1907. U.S. Patent 1,085,971 was issued on February 3, 1914.

The Huanggang Uprising was launched on 22 May 1907, in Chaozhou. The Revolutionary party, along with Xu Xueqiu , Chen Yongpo and Yu Tongshi, launched the uprising and captured Huanggang city. Other Japanese that followed include and. After the uprising began, the Qing government quickly and forcefully suppressed it. Around 200 revolutionaries were killed.