heliogram

Just then my mind was considerably relieved by a heliogram from Baker informing me that he was on his way back to Kabul.

Each of us was allowed to send a brief heliogram, balloting for turn.

The morning following the receipt of the heliogram we broke camp at daylight.

Though news by heliogram came slowly and at long intervals, all were conscious that something was afloat.

This instruction was not included in the original heliogram, but was annexed to it as an afterthought in a supplementary message.