Initially, the armament was quite weak, one 7.7 mm ( . 303 in ) Lewis Gun in the dorsal position, and one in each beam position.
12.
1925 saw the first use of electrical motors to move the fixture, and with it the beam position, by Herbet F . King ( US patent number : 1, 680, 685 ).
13.
This guarantees relatively high intensity, good wavelength selectivity ( about 1 part in 10000 ) and the possibility to change the target wavelength without having to change the beam position ( " fixed exit " ).
14.
The lowest beam position was used to alert the operator that a bomb was in flight and where to expect it on his screen; once alerted he tilted the beam into the first position and then into the next.
15.
In addition to these two terms, if the origin of coordinates is located outside the beam axis, there is a third angular momentum contribution obtained as the cross-product of the beam position and its total momentum.
16.
A program tightly integrated with the display cycle and aware of the electron beam position relative to the current display can bypass turning off Display List DMA . Likewise, turning off the display is not needed if the setup occurs during the vertical blank.
17.
These include ( but are not limited to ) Beam Position Monitors ( BPMs ) to measure the position of the bunch, screens ( fluorescent screens, Optical Transition Radiation ( OTR ) devices ) to image the profile of the bunch, wire-scanners to measure its cross-section, and toroids or ICTs to measure the bunch charge ( i . e ., the number of particles per bunch ).
