Edwin K. Sloat

space navigation n.	1928 E. K. Sloat Flight to Venus in Amazing Stories Dec. 780/2 The earliest experiments in space navigation failed to interest him, but when Peabody made his ill-fated attempt to circumnavigate the moon in his radion globe…Prof. Morteshang became intensely interested in the subject.
visiscreen n.	1932 E. K. Sloat Loot of the Void in Astounding Stories 8/2 Penrun sprang to the small visi[-]screen beside the board and snapped on the current. Swiftly he revolved the periscope aerial. There appeared on the screen the hull of a long, rakish, cigar-shaped craft.