I will try to remember when posting images/drawings to include the source where I got them from in future.
Regarding the See's Ash Ejectors:
I found an entry on page 602 in the 1893 book American Engineer Volume LXVIII.
It states the following:
"In order that there may be no clogging it is found necessary to admit some air with the stream of water. This is done by placing an air-valve in the inclined pipe. Sometimes it is placed in the delivery pipe near the top of the hopper, and somelinies at the point marked by a circle in the engraving."
As this is for the RECENTLY DESIGNED HYDRO-PNEUMATIC ASH EJECTOR (back in 1893), it could be determined that by 1910 the design had been improved upon, and the air stream could have been introduced into the pipework prior to entering the bottom of the hopper. Similar to what is shown on the Ceramic drawings.