In the postcard above, from 12 Tammuz 5740, the Rivevos Ephraim asks me my opinion of the halacha of where to light candles if a husband is eating in a sukkah and the wife inside the house. (My response is lost to posterity...).
He then writes about whether a male lifeguard can guard a pool in which women are swimming.
In the letter above, from 23 Tammuz 5740, Rabbi Greenblatt responds to the following questions:
1. The status on Shabbos of an urn with a glass pipe that shows the water level.
2. Is there a problem reading by the light of a candle on Shabbos when there is an electric light in close proximity?
3-4. Here he responds briefly to a discourses that I wrote him on the German custom of waiting three hours between meat and milk and on shelichus l'akum.
5. Here he responds to the question of when kol pasuk d'lo paskei Moshe anan lo paskinan.
He ends by asking me my opinion as to a person who ate half a kezayis of HaMotzi and half a kezayis of Mezonos, what brachah does he make afterwards?