Western Front Airfield Operations

[Starlight]

I have been reading my grandfather's war diaries of 1917/18 and have come across some terms that I have not been able to identify. He was a corporal in #6 Squadron (in charge of Wireless at the start of the third battle of Ypres) and mentioned the following:

BOBBING

There are four entries re "bobbing"

1. "Bobbing all day" - 06/07/16. This was at the Abeele aerodrome where #6 Squadron was based at the time, flying BE2 (d's and e's). As my grandfather was not an observer (though he did go up on occasion to test developments in wireless and the various new codes), I assume that it was an operation at the camp itself.

2. "Lt Hickie warns me to understudy Sgt Barnes - Johnny Bob!". - 15/07/17. My grandfather had recently been promoted from 1st Class A/M to Corporal (Squadron Orderly Corporal) and often visited the Batteries with Lt Hickie (in tender and by plane - by now RE8's). Sgt Barnes went on leave two weeks after this entry. As the aerodrome was bombed many times, could "bobbing" be to do with trench works around the aerodrome?

3. "Bobbing all day. Confined to camp". This was entered on two consecutive days, 21/11/17 and 22/11/17, three days after the squadron moved from Abeele to Bertangles Aerodrome.
4. "Digging dugouts in front of the huts. Bobbing on bombs"
PUFF SHOOTS

There are two entries re "Puff Shoots", whilst at Bertangles when they were confined to camp because of the poor conditions. The first entry was "Puff shoots in the snow, bitterly cold" - 28/12/17. The second was "Palmer burnt with a puff" - 03/01/18
From another forum I’ve had a reply that described it as a pinpointing exercise used by the Canadian AirForce whereby small charges of powder are fired to simulate artillery shells, with an aircraft above the aerodrome transmitting signals to the wireless officer below. Does anyone have any more details on this.

TORPEDO

There is only the single mention of the "torpedo" - "working with Lt Wilson in the lorry on his wireless torpedo". Most of the wireless equipment was kept in the lorry, which was driven around from the aerodrome to the batteries. My grandfather worked in it a lot. I've researched the word 'torpedo' and I do not think it could have been refering to an aerial torpedo, as the testing of this I believe was confined to Britain and not in France.
Can anyone provide me with some answers?

Starlight