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Rh duty-man up there, giving me a chance to get at the projector controls if Miko's signal should come.

I drew Anita past Brotow, who had stood aside. "Thanks," I repeated. "We won't be long."

We mounted the little ladder.

CHAPTER XXXI

In the Tower Cubby

URRY, Anita!"

I feared that Potah might come up from the hull at any moment and stop us. The duty-man over us gazed down, his huge head and shoulders blocking the small signal room window. Brotow called up in Martian, telling him to let us come. He scowled, but when we reached the trap in the room floor-grid, we found him standing aside to admit us.

I flung a swift glance around. It was a metallic cubby, not much over fifteen feet square, with an eight-foot arched ceiling. There were instrument panels. The range-finder for the giant projector was here; its little telescope with the trajectory apparatus and the firing switch were unmistakable. And the signalling apparatus was here! Not a Martian set, but a fully powerful Botz ultra-violet helio sender with its attendant receiving mirrors. The Planetara had used the Botz system, so I was thoroughly familiar with it. I saw, too, what seemed to be weapons: a row of small fragile glass globes, hanging on clips along the wall—bombs, each the size of a man's fist. And a broad belt with bombs in its padded compartments.

My heart, was pounding as my first quick glance took in these details. I saw also that the room had four small oval window openings. They were breast-high above the floor; from the deck below I knew that the angle of vision was such that the men down there could not see into this room except to glimpse its upper portion near the ceiling. And the helio set was banked on a low table near the floor.

In a corner of the room a small ladder led through a ceiling trap to the cubby roof. This upper trap was open. Four feet above the room-roof was the arch of the dome, with the entrance to the upper exit-lock directly above us. The weapons and the belt of bombs were near this ascending ladder, evidently placed here as equipment for use from the top of the dome.

TURNED to the solitary duty-man, I must gain his confidence at once. Anita had laid her helmet aside. She spoke first.

"We were with Set Miko," she said smilingly, "in the wreck of the Planetara. You heard of it? We know where the treasure is."

This duty-man was a full seven feet tall, and the most heavy-set Martian I had ever seen. A tremendous, beetling-browed, scowling fellow. He stood with hands on his hips, his leather-garbed legs spread wide; and as I fronted him I felt like a child. He was silent, glaring down at me as I drew his attention, from Anita.

"You speak English? We are not skilled with Martian."

I wondered if at the next time of sleep this fellow would be on duty here. I hoped not; it would not be easy to trick him and find an opportunity to flash a signal. But that task was some hours away as yet; I would worry about it when the time came. Just now I was concerned with Miko and his little band, who at any moment might arrive in sight. If we could persuade this scowling duty-man to turn the projector on them

He answered me in ready English:

"You are the man Gregg Haljan? And this is the sister of George Prince—what do you want up here?"

"I am a navigator. Brotow wants me to pilot the ship when we advance to attack Grantline."

"This is not the control room."

"No, I know it isn't."

I put my helmet carefully on the floor-grid beside Anita's. I